{ "data": { "a": { "slug": "celesto", "name": "Celesto (formerly SmolVM)", "vendor": "Celesto AI, Inc.", "vendorUrl": "https://celesto.ai", "kind": "sdk", "category": "code-sandboxes", "summary": "Celesto, formerly SmolVM, is an open-source Python SDK and CLI from Celesto AI that runs disposable Firecracker or QEMU microVMs on the owner's machine for agent code, browsers and desktops, with an optional paid Celesto Cloud.", "url": "https://www.anchorterminal.com/tools/celesto", "markdownUrl": "https://www.anchorterminal.com/tools/celesto.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/celesto.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/celesto.json", "dns": "celesto.grade.anchorterminal.com", "repo": "https://github.com/CelestoAI/Celesto", "license": "Apache-2.0", "transports": [], "packages": [ { "registry": "pypi", "name": "celesto" } ], "auth": "none", "authNotes": "Local use needs no account or key. The local API server and dashboard each require a bearer token, generated at start or read from CELESTO_SERVER_TOKEN and CELESTO_DASHBOARD_TOKEN. Celesto Cloud uses an organisation-bound CELESTO_API_KEY with named permissions (see, execute, delete) set in the dashboard.", "pricing": "freemium", "pricingNotes": "The local SDK and CLI are free under Apache-2.0. Celesto Cloud bills sandboxes by the running hour from $0.015 (Micro, 1 vCPU, 2 GB) to $0.16 (XL, 8 vCPU, 32 GB), prepaid from $2.01, with a one-time $5 Micro credit and no card.", "priceSummary": "$0.015 / session-hr", "where": "local", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the repository, the docs, llms.txt or the pricing page (checked 2026-11-06). Cloud runtime is prepaid by card under Settings \u003e Billing.", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 1149, "npmWeekly": null, "pypiWeekly": 699, "asOf": "2026-11-06" }, "docsUrl": "https://celesto.ai/docs", "llmsTxt": "https://celesto.ai/llms.txt", "openapi": "https://github.com/CelestoAI/Celesto/blob/main/ts/celesto-local-server.openapi.json", "capabilities": [ "sandbox.code", "sandbox.fs", "sandbox.persist", "sandbox.browser" ], "tags": [ "open-source", "local", "self-hosted", "hosted", "freemium", "no-card", "free-tier", "apache-2.0", "python", "typescript", "cli", "microvm", "firecracker", "llms-txt", "openapi", "telemetry", "pre-1.0", "renamed" ], "lastRelease": "2026-11-05", "graded": true, "anchor": { "graded": true, "score": 68, "grade": "B", "agentReady": false, "rank": 298, "ranked": true, "rankOf": 1486, "categoryRank": 6, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 69, "maintenance": 81, "payments": 60, "reliability": 66, "schema": 85, "security": 52, "transparency": 70 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-06" }, "negative": 0, "verdict": "Celesto runs each agent task in a local Firecracker or QEMU microVM with its own kernel, driven by a CLI with a stable JSON envelope and a Python SDK, free under Apache-2.0. It is pre-1.0, renamed from SmolVM on 19 September 2026, sends usage telemetry after a first-use notice, and leaves outbound networking open unless a mode is set.", "bestFor": "Local microVM sandboxes for agent code, browsers and desktops on Linux and macOS, with a path to a hosted cloud.", "strengths": [ "Apache-2.0, installs from PyPI with `celesto setup` and `celesto doctor`, and runs local microVMs with no account or key", "Every `--json` response has the same `ok`, `command`, `exit_code`, `data` and `error` fields, with recovery commands in errors", "Network modes `off`, `public` (proxy that rejects private and metadata addresses) and `restricted` with CIDR or domain allowlists", "Dated changelog with Security sections, breaking changes marked, and 22 PyPI releases in the 90 days to 6 November 2026", "OpenAPI documents for the local server (24 operations) and the cloud API (171 operations) in the repository, plus llms.txt" ], "weaknesses": [ "Version 0.1.13 and declared pre-1.0 in SECURITY.md, with the TypeScript SDK an alpha installed from a GitHub tarball", "Outbound network access is open by default, and Linux TAP mode does not block every private network or metadata service", "Usage telemetry to PostHog is on after a first-use notice, until switched off", "Renamed from SmolVM on 19 September 2026 in a breaking release that removed the `smolvm` command and import path", "No security.txt, bug bounty or certification found, and CI results could not be read" ], "agentNotes": [ "Pass `--json` to every `celesto` command and branch on `ok` and `exit_code`, not on printed text", "Create computers with unique names and delete them by exact name when the job ends, including after failures", "Set `internet_settings={\"mode\": \"off\"}` or `restricted` for untrusted code, since the default is open", "Set CELESTO_NO_TELEMETRY=1 in unattended runs if usage events must not leave the machine", "Never paste browser or display connection URLs into model context; possession of the URL grants control" ], "metrics": { "kind": "local", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 68 } ], "editorialScores": { "ergonomics": 69, "maintenance": 81, "payments": 60, "reliability": 66, "schema": 85, "security": 52, "transparency": 74 }, "provenanceScore": 66, "checked": { "categories": { "ergonomics": "2026-11-06", "maintenance": "2026-11-06", "payments": "2026-11-06", "reliability": "2026-11-06", "schema": "2026-11-06", "security": "2026-11-06", "transparency": "2026-11-06" }, "last": "2026-11-06", "oldest": "2026-11-06", "stale": false, "staleAfterDays": 90 } }, "connect": { "install": "pip install celesto \u0026\u0026 celesto setup \u0026\u0026 celesto doctor", "headless": { "create": "celesto computer create --name agent-job --json", "delete": "celesto computer delete agent-job --json", "exec": "celesto computer exec agent-job --json -- python -m pytest" } }, "letme": { "capability": "https://letme.dev/sandbox.code", "tool": "https://letme.dev/celesto" }, "area": "agent-runtime", "unitPrices": [ { "item": "Cloud Micro sandbox (1 vCPU, 2 GB)", "unit": "session-hour", "usd": 0.015, "note": "Billed by the running hour; local use is free" }, { "item": "Cloud XL sandbox (8 vCPU, 32 GB)", "unit": "session-hour", "usd": 0.16, "note": "Largest size on the pricing page" } ], "provenance": { "legalEntity": "Celesto AI, Inc.", "domain": "celesto.ai", "domainRegistered": "2025-07-13", "endpointOnVendorDomain": null, "terms": "https://celesto.ai/legal/terms", "privacy": "https://celesto.ai/legal/privacy-policy", "statusPage": "", "changelog": "https://github.com/CelestoAI/Celesto/blob/main/CHANGELOG.md", "securityTxt": "none", "checked": "2026-11-06", "notes": [ "The privacy policy, last updated 30 October 2026, names Celesto AI, Inc., a Delaware corporation with a Wilmington mailing address. It has no clause on automated access.", "celesto.ai/robots.txt allows all crawlers. docs.celesto.ai carries Content-Signal ai-train=yes, search=yes, ai-input=yes.", "RDAP gives celesto.ai a registration date of 13 July 2025.", "/.well-known/security.txt returns 404. SECURITY.md asks for private reports through GitHub's vulnerability reporting. No status page is linked from the pricing page." ], "score": 66 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/celesto.json", "live": { "slug": "celesto", "versions": [ { "registry": "github", "name": "CelestoAI/Celesto", "version": "v0.1.13", "released": "2026-11-05", "seenAt": "2026-11-06T23:13:37.416837168Z" }, { "registry": "pypi", "name": "celesto", "version": "0.1.13", "released": "2026-11-05", "seenAt": "2026-11-06T23:13:37.309276304Z" } ], "githubStars": 1149, "pypiWeekly": 699, "securityTxt": { "url": "https://celesto.ai/.well-known/security.txt", "state": "unknown", "checkedAt": "2026-11-07T16:01:01.176888246Z" }, "llmsTxt": { "url": "https://celesto.ai/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-07T15:31:46.784166983Z" }, "pages": [ { "url": "https://raw.githubusercontent.com/CelestoAI/Celesto/main/CHANGELOG.md", "kind": "changelog", "status": 200, "checkedAt": "2026-11-07T14:18:00.719411253Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "8ddae4a6adbd" }, { "url": "https://celesto.ai/legal/privacy-policy", "kind": "privacy", "status": 200, "checkedAt": "2026-11-07T14:00:50.868104256Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "87ce310b1db6" }, { "url": "https://celesto.ai/legal/terms", "kind": "terms", "status": 200, "checkedAt": "2026-11-07T14:00:53.107282947Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "1dece6f9a42e" } ], "updatedAt": "2026-11-07T16:01:01.176888246Z" } }, "answer": "Celesto (formerly SmolVM) scores 68 (B) on agent readiness against Together Code Sandbox's 54.7 (C), and leads in 4 of 7 scored categories.", "b": { "slug": "together-code-sandbox", "name": "Together Code Sandbox", "vendor": "Together AI", "vendorUrl": "https://www.together.ai", "kind": "http-api", "category": "code-sandboxes", "summary": "Together AI's hosted virtual machine sandboxes for running commands and code, built from Docker-image snapshots and driven from the `together-sandbox` Python SDK, TypeScript SDK or CLI. Access is by allowlist, on request to Together.", "url": "https://www.anchorterminal.com/tools/together-code-sandbox", "markdownUrl": "https://www.anchorterminal.com/tools/together-code-sandbox.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/together-code-sandbox.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/together-code-sandbox.json", "dns": "together-code-sandbox.grade.anchorterminal.com", "repo": "https://github.com/togethercomputer/together-sandbox", "license": "Proprietary service under Together's terms of service. The SDKs, CLI and OpenAPI documents on GitHub are MIT", "transports": [ "http" ], "remoteUrl": "https://api.bartender.codesandbox.io", "packages": [ { "registry": "pypi", "name": "together-sandbox" }, { "registry": "npm", "name": "together-sandbox" } ], "auth": "api-key", "authNotes": "Access is by allowlist. The docs say the `together-sandbox` SDK and CLI must be enabled for an organisation and to contact Together to request it. Once enabled, a project-scoped Together API key is sent as a Bearer token, read from `TOGETHER_API_KEY`. Keys are revocable, can carry an expiry date and have no finer scopes. Each running sandbox also has its own agent token for the in-VM API, which the SDKs handle.", "pricing": "usage", "pricingNotes": "The pricing page lists Code Sandbox compute at $0.0446 per vCPU-hour and $0.0149 per GiB of RAM per hour, and does not say whether that rate covers the new SDK as well as the legacy one. No free tier or sandbox lets an agent start without a contract. Together has no free trial, platform access needs a $15 first credit purchase, and the organisation must then be enabled on request (https://www.together.ai/pricing, https://docs.together.ai/docs/billing-credits).", "priceSummary": "$0.0446 / vCPU-hr", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the docs page, the repository or the pricing page (checked 2026-10-08).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 3, "npmWeekly": 1298, "pypiWeekly": null, "asOf": "2026-10-08" }, "docsUrl": "https://docs.together.ai/docs/together-code-sandbox", "llmsTxt": "https://docs.together.ai/llms.txt", "openapi": "https://togethercomputer.github.io/together-sandbox/api-openapi.json", "capabilities": [ "sandbox.code", "sandbox.fs", "sandbox.persist" ], "tags": [ "hosted", "usage", "allowlist", "sales-led", "openapi", "llms-txt", "python", "typescript", "cli", "security-txt" ], "lastRelease": "2026-10-07", "graded": true, "anchor": { "graded": true, "score": 54.7, "grade": "C", "agentReady": false, "rank": 896, "ranked": true, "rankOf": 1486, "categoryRank": 18, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 70, "maintenance": 83, "payments": 20, "reliability": 32, "schema": 86, "security": 46, "transparency": 59 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-04" }, "negative": 0, "verdict": "Two public OpenAPI documents, MIT clients for Python and TypeScript, cursor pagination and SDK retries with guidance on which writes not to retry make the surface easy for an agent to drive. Access is the limit. Together enables the SDK per organisation on request, publishes no rate limits or SLA, and its status page has no sandbox component.", "bestFor": "Teams already buying from Together, and former CodeSandbox SDK users, who want Docker-defined sandboxes with disk and memory snapshots from Python or TypeScript.", "strengths": [ "Public OpenAPI documents for the management API (17 operations) and the in-VM API (25), in the repository and on GitHub Pages", "Terminating with `memory: true` saves disk and memory, and a new sandbox created from that snapshot resumes its running processes", "List calls are cursor-paginated (1 to 100 a page) with filters for status, source snapshot and tags", "Both SDKs retry 408, 429 and 5xx three times with exponential backoff, and the docs warn that `snapshots.create` is not idempotent", "Four tagged releases from 10 August to 7 October 2026, with a generated changelog that marks breaking changes" ], "weaknesses": [ "The SDK and CLI work only for organisations Together has enabled, and the docs say to contact Together for access", "No rate limits, concurrency limits or SLA found, and status.together.ai has no component for the sandbox service", "Every sandbox port is public unless an experimental inbound policy is set, and no outbound controls exist yet", "Three major versions between 2 June and 28 July 2026, and memory snapshots were removed in 4.0.0 and restored in 4.0.4", "The management API answers at `api.bartender.codesandbox.io`, off Together's domain, and the privacy policy's data table has no sandbox row" ], "agentNotes": [ "Confirm the organisation is on Together's allowlist before installing. A valid `TOGETHER_API_KEY` alone is not enough", "Build a snapshot first with `snapshots.create`. No default image exists, and every sandbox needs `snapshot_id` or `snapshot_alias`", "Set `ttl` at creation or call `terminate()`. Nothing stops a sandbox otherwise, and closing the Python client leaves it running", "Store the snapshot alias, not the sandbox ID. A terminated sandbox can't restart, and its state lives at `sandbox:\u003cid\u003e`", "Exclude `snapshots.create` from retries with `should_retry`, and set `experimental.network_policy` before serving anything private on a port" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 54.7 } ], "editorialScores": { "ergonomics": 70, "maintenance": 83, "payments": 20, "reliability": 32, "schema": 86, "security": 46, "transparency": 38 }, "provenanceScore": 80, "checked": { "categories": { "ergonomics": "2026-11-04", "maintenance": "2026-11-04", "payments": "2026-11-04", "reliability": "2026-11-04", "schema": "2026-11-04", "security": "2026-11-04", "transparency": "2026-11-04" }, "last": "2026-11-04", "lastMoved": "2026-11-04", "oldest": "2026-11-04", "stale": false, "staleAfterDays": 90 } }, "connect": { "install": "pip install together-sandbox # or npm install together-sandbox" }, "letme": { "capability": "https://letme.dev/sandbox.code", "tool": "https://letme.dev/together-code-sandbox" }, "sameCompany": [ "together-inference", "together-fine-tuning", "together-gpu-clusters" ], "area": "agent-runtime", "unitPrices": [ { "item": "vCPU", "unit": "vcpu-hour", "usd": 0.0446, "note": "RAM extra at $0.0149 per GiB-hour. Listed under Code Sandbox on the pricing page, which doesn't name the SDK" }, { "item": "Default sandbox (1 vCPU, 2 GiB)", "unit": "session-hour", "usd": 0.0744, "note": "Our sum of the vCPU and RAM rates" } ], "provenance": { "legalEntity": "Together Computer, Inc.", "domain": "together.ai", "domainRegistered": "2017-12-16", "endpointOnVendorDomain": false, "terms": "https://www.together.ai/terms-of-service", "privacy": "https://www.together.ai/privacy", "statusPage": "https://status.together.ai", "changelog": "https://github.com/togethercomputer/together-sandbox/blob/main/CHANGELOG.md", "securityTxt": "valid", "checked": "2026-11-04", "notes": [ "The terms of service (updated 19 May 2026) name Together Computer, Inc., a Delaware corporation at 251 Rhode Island Street, San Francisco, and cover the website and the Services. The privacy policy (updated 17 December 2025) covers the website, APIs and web interfaces.", "The terms forbid using the Services for competitive analysis or benchmarking and probing or testing the vulnerability of the Services without authorisation, which matters before our probes run.", "The management API answers at api.bartender.codesandbox.io and sandbox URLs sit under csb.app. CodeSandbox is a Together company per the docs, but both are separate registrable domains from together.ai.", "status.together.ai has no sandbox component (4 November 2026). status.codesandbox.io listed the CodeSandbox API and two clusters on 8 October and did not name this service; not re-read on 4 November, as codesandbox.io answers a bot check and its terms are unread.", "security.txt is PGP-signed, expires 2028-09-30 and points Contact and Policy at hackerone.com/together_ai. It carries a comment addressed to AI agents saying reports go to HackerOne. Recorded as a fact, and we did not act on it.", "RDAP for together.ai gives a registration date of 2017-12-16.", "trust.together.ai is script-drawn and showed our reader only its title. No DPA or sub-processor page was found." ], "score": 80 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/together-code-sandbox.json", "live": { "slug": "together-code-sandbox", "probe": { "target": "https://api.bartender.codesandbox.io", "method": "get", "lastAt": "2026-11-07T18:21:00.726174935Z", "lastOk": true, "lastStatus": 404, "lastMs": 187, "authRequired": false, "uptime24h": 100, "uptime30d": 99.97, "p50ms24h": 153, "p95ms24h": 386, "samples24h": 239, "samples30d": 7289, "days": [ { "date": "2026-10-09", "probes": 169, "ok": 169 }, { "date": "2026-10-10", "probes": 247, "ok": 247 }, { "date": "2026-10-11", "probes": 247, "ok": 247 }, { "date": "2026-10-12", "probes": 247, "ok": 246 }, { "date": "2026-10-13", "probes": 248, "ok": 248 }, { "date": "2026-10-14", "probes": 249, "ok": 249 }, { "date": "2026-10-15", "probes": 253, "ok": 253 }, { "date": "2026-10-16", "probes": 252, "ok": 252 }, { "date": "2026-10-17", "probes": 253, "ok": 253 }, { "date": "2026-10-18", "probes": 256, "ok": 255 }, { "date": "2026-10-19", "probes": 255, "ok": 255 }, { "date": "2026-10-20", "probes": 252, "ok": 252 }, { "date": "2026-10-21", "probes": 253, "ok": 253 }, { "date": "2026-10-22", "probes": 253, "ok": 253 }, { "date": "2026-10-23", "probes": 248, "ok": 248 }, { "date": "2026-10-24", "probes": 251, "ok": 251 }, { "date": "2026-10-25", "probes": 250, "ok": 250 }, { "date": "2026-10-26", "probes": 252, "ok": 252 }, { "date": "2026-10-27", "probes": 249, "ok": 249 }, { "date": "2026-10-28", "probes": 250, "ok": 250 }, { "date": "2026-10-29", "probes": 249, "ok": 249 }, { "date": "2026-10-30", "probes": 249, "ok": 249 }, { "date": "2026-10-31", "probes": 251, "ok": 251 }, { "date": "2026-11-01", "probes": 249, "ok": 249 }, { "date": "2026-11-02", "probes": 250, "ok": 250 }, { "date": "2026-11-03", "probes": 248, "ok": 248 }, { "date": "2026-11-04", "probes": 246, "ok": 246 }, { "date": "2026-11-05", "probes": 185, "ok": 185 }, { "date": "2026-11-06", "probes": 241, "ok": 241 }, { "date": "2026-11-07", "probes": 187, "ok": 187 } ] }, "vendorStatus": { "page": "https://status.together.ai", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-11-07T04:48:52.910115695Z" }, "versions": [ { "registry": "github", "name": "togethercomputer/together-sandbox", "version": "together-sandbox-workspace-v4.1.1", "released": "2026-10-07", "seenAt": "2026-11-07T00:12:07.818818886Z" }, { "registry": "npm", "name": "together-sandbox", "version": "4.1.1", "seenAt": "2026-11-07T00:12:07.050373676Z" }, { "registry": "pypi", "name": "together-sandbox", "version": "4.1.1", "released": "2026-10-07", "seenAt": "2026-11-07T00:12:06.872291994Z" } ], "githubStars": 3, "npmWeekly": 821, "pypiWeekly": 1840, "securityTxt": { "url": "https://together.ai/.well-known/security.txt", "state": "valid", "expires": "2028-09-30T00:00:00.000Z", "checkedAt": "2026-11-07T16:00:47.073630606Z" }, "llmsTxt": { "url": "https://docs.together.ai/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-07T15:34:08.494654639Z" }, "domain": { "domain": "together.ai", "registered": "2017-12-16", "source": "https://rdap.identitydigital.services/rdap/domain/together.ai", "checkedAt": "2026-11-01T14:21:27.260418255Z" }, "pages": [ { "url": "https://raw.githubusercontent.com/togethercomputer/together-sandbox/main/CHANGELOG.md", "kind": "changelog", "status": 304, "checkedAt": "2026-11-07T14:23:49.046298895Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "0441361f331e" }, { "url": "https://www.together.ai/pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-11-07T14:35:44.029828239Z", "changedAt": "2026-11-07T14:35:44.029828239Z", "fingerprint": "a8ec70c61c83" }, { "url": "https://www.together.ai/privacy", "kind": "privacy", "status": 304, "checkedAt": "2026-11-07T14:35:50.480540654Z", "changedAt": "2026-11-05T13:19:06.164818677Z", "fingerprint": "e59194470575" }, { "url": "https://www.together.ai/terms-of-service", "kind": "terms", "status": 304, "checkedAt": "2026-11-07T14:35:50.53830033Z", "changedAt": "2026-11-05T13:19:08.039174827Z", "fingerprint": "3ee71349d70e" } ], "github": { "repo": "togethercomputer/together-sandbox", "checkedAt": "2026-11-02T09:32:17.890760568Z", "stars": 3, "archived": false, "issuesEnabled": true, "pushedAt": "2026-10-27T05:16:34Z", "openIssues": 0, "openPRs": 8, "issuesOpened90d": 0, "issuesClosed90d": 0, "prsMerged90d": 13, "ci": { "branch": "main", "runs": 50, "success": 48, "failure": 2, "other": 0, "latest": "success", "latestAt": "2026-10-27T05:16:46Z" } }, "updatedAt": "2026-11-07T18:21:00.726174935Z" } }, "edges": [ { "by": 40, "category": "payments", "leads": "celesto", "name": "Payments \u0026 pricing", "reasons": { "a": "Read with the self-hosted rule, scoring the hosted option for the price lines. No x402, MPP or L402 (0 of 40). Celesto Cloud publishes hourly prices for six sizes without a login (20). A one-time $5 Micro credit needs no card, and the local SDK is free (20). The graded local SDK installs from PyPI and runs with no account, so an agent needs no signup (20). Cloud use needs a browser signup and a card top-up. Total 60.", "b": "No x402, MPP or L402 found (0). The pricing page still lists Code Sandbox at $0.0446 per vCPU-hour and $0.0149 per GiB of RAM per hour without a login, and does not say whether the rate covers the new SDK as well as the legacy one (20). The billing docs say Together has no free trial and that platform access needs a minimum $15 credit purchase (0). Access needs a browser signup, a payment and a request to Together to enable the organisation (0). 0 + 20 + 0 + 0 = 20." }, "scores": { "a": 60, "b": 20 } }, { "by": 34, "category": "reliability", "leads": "celesto", "name": "Reliability", "reasons": { "a": "Read with the local-software lines, because the graded surface runs on the owner's machine. Installs from PyPI as `celesto` with Python 3.11 or newer on Linux and macOS stated, plus an install script (20). The repository has pytest, e2e, lint, TypeScript and smoke-test workflows and 38 test packages, but GitHub's API answered with a rate limit, so no run result was read (15 of 25, unchecked). 22 open issues and pull requests against about 188 commits in 90 days. The open bugs include a snapshot restore that can lose a VM's disk if interrupted and a thread-safety issue with five replies (18 of 25). A dated changelog with Security, Fixed, Added and Removed sections, and the rename to Celesto marked as a breaking release, though versions stay below 1.0 (13 of 15). Pre-1.0 per SECURITY.md (0). Total 66.", "b": "Read with the hosted lines. status.together.ai lists the website, the playground and inference models with no component for the sandbox service, and a vendor status page with no component for the product takes 15. Incident line kept at 5. The Together page posts no incident since 6 January 2025, while status.codesandbox.io, which lists the CodeSandbox API and two clusters, wasn't re-read on 4 November (codesandbox.io answers a bot check, so its terms are unread), per the 8 October check (5). No rate or concurrency limits found, and the migration guide says the concurrency count and limit are not exposed (0). Both SDKs retry 408, 429, 500, 502, 503 and 504 three times with exponential backoff from 0.5 seconds plus jitter, and the SDK references say `snapshots.create` is not idempotent and should be excluded from retries. That is safe-retry guidance with no idempotency keys (12). No SLA found, and the terms make no uptime guarantee outside an order form (0). The docs still say the SDK must be enabled for an organisation, on request to sales, which is not general availability (0). 15 + 5 + 0 + 12 + 0 + 0 = 32." }, "scores": { "a": 66, "b": 32 } }, { "by": 11, "category": "transparency", "leads": "celesto", "name": "Transparency \u0026 trust", "reasons": { "a": "Apache-2.0 in LICENSE and on PyPI (30). The privacy policy of 30 October 2026 links a subprocessor registry and describes the CLI telemetry in the same terms as the docs, but gives no retention periods beyond as long as necessary. Stopped cloud disks are kept 30 days per the pricing page (18 of 30). The changelog marks removals and the breaking rename, and the glossary lists older names still accepted, with no written deprecation policy (10 of 20). Telemetry is disclosed in the README, CLI reference and privacy policy, with three opt-outs, but it is on by default after the notice (16 of 20). Total 74.", "b": "A closed service under Together's terms of service (19 May 2026). The SDKs, CLI and OpenAPI documents are MIT, which doesn't raise the line for a closed API, as for the Together inference and fine-tuning listings (15). The privacy policy (17 December 2025) says data is not used for training without opt-in. Its table of data types covers inference, fine-tuning and GPU clusters with no sandbox row, and no retention period for sandbox filesystems or snapshots was found beyond an optional snapshot `ttl` (12). The legacy `@codesandbox/sdk` page is still marked deprecated with no end date, the deprecations page covers models only, and breaking SDK changes are marked in the changelog. Kept as a partial (8). No sub-processor list or data locations for sandboxes found. A docs example names a cluster `na-us-ce-01`, and the trust centre was unread (3). 15 + 12 + 8 + 3 = 38." }, "scores": { "a": 70, "b": 59 } }, { "by": 6, "category": "security", "leads": "celesto", "name": "Security \u0026 auth", "reasons": { "a": "Framework reading for local software. No credential is needed for local use, and the local API server and dashboard each require a bearer token, and cloud keys carry named permissions (22 of 30). Each computer has its own guest kernel, browser and display access uses capability URLs with a read-only option, and raw VNC is off. Against that, outbound networking is open by default and the restricting modes are opt-in (12 of 20). The security doc warns against giving connection URLs to a model as page content, but there is no guidance on treating command or page output as untrusted (5 of 15). `computer logs` shows startup output, with no audit log of commands (5 of 15). SECURITY.md with GitHub private vulnerability reporting and a supported-versions table, Security sections in the changelog, no security.txt, bug bounty or certification (8 of 20). Total 52.", "b": "Project-scoped API keys, revocable within about five minutes, with optional expiry and rotation guidance, read as the Together inference and fine-tuning listings read the same key model (30). The in-VM OpenAPI document still lists `?token=` as a documented way to authenticate the WebSocket exec path, so the checklist's fixed 10 comes off (20). Each sandbox is a virtual machine. Every port is open to everyone unless the experimental inbound policy is set, no outbound rules exist, and project roles are admin and editor with no read-only role (8). The sandbox returns the output of code the agent ran, with no guidance on untrusted output found (8). Sandboxes can be listed with tags and `status_reason`. No audit log found (3). A PGP-signed security.txt (Expires 2028-09-30) points Contact and Policy at HackerOne with no acknowledgement time, the value this run gives a disclosure route with no stated time (7). 20 + 8 + 8 + 3 + 7 = 46." }, "scores": { "a": 52, "b": 46 } } ], "facts": [ { "a": "SDK + MCP", "b": "HTTP API", "name": "Kind" }, { "a": "Celesto AI, Inc.", "b": "Together AI", "name": "Vendor" }, { "a": "no (local only)", "b": "https://api.bartender.codesandbox.io", "name": "Hosted endpoint" }, { "a": "", "b": "HTTP", "name": "Transports" }, { "a": "None", "b": "API key", "name": "Auth" }, { "a": "Freemium", "b": "Pay per use", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Apache-2.0", "b": "Proprietary service under Together's terms of service. The SDKs, CLI and OpenAPI documents on GitHub are MIT", "name": "Licence" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "2026-11-05", "b": "2026-10-07", "name": "Last release" }, { "a": "2026-10-30", "b": "no date given", "name": "Terms last updated" }, { "a": "2026-10-30", "b": "no date given", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms restrict automated access" }, { "a": "not found in the text", "b": "yes", "name": "Terms restrict benchmarking" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms or service can change without notice" }, { "a": "not found in the text", "b": "not found in the text", "name": "Arbitration or class-action waiver" }, { "a": "1.1k stars, 699 PyPI/wk", "b": "3 stars, 1.3k npm/wk", "name": "Popularity" } ], "faq": [ { "answer": "Celesto (formerly SmolVM) scores 68 (B) on agent readiness against Together Code Sandbox's 54.7 (C), and leads in 4 of 7 scored categories.", "question": "Which is better for AI agents, Celesto (formerly SmolVM) or Together Code Sandbox?" }, { "answer": "No hosted endpoint is listed for Celesto (formerly SmolVM). Together Code Sandbox has a hosted endpoint at https://api.bartender.codesandbox.io.", "question": "Can an agent call Celesto (formerly SmolVM) and Together Code Sandbox without installing anything?" }, { "answer": "Celesto (formerly SmolVM) is open source (Apache-2.0). No open-source release is listed for Together Code Sandbox.", "question": "Are Celesto (formerly SmolVM) and Together Code Sandbox open source?" } ], "goodFor": [ { "aheadOn": [ "Reliability, 66 against 32", "Security \u0026 auth, 52 against 46", "Payments \u0026 pricing, 60 against 20", "Transparency \u0026 trust, 70 against 59" ], "also": [ "No key needed to call it", "Free to start without a card", "Open source" ], "goodFor": "Local microVM sandboxes for agent code, browsers and desktops on Linux and macOS, with a path to a hosted cloud.", "slug": "celesto", "watchFor": "Version 0.1.13 and declared pre-1.0 in SECURITY.md, with the TypeScript SDK an alpha installed from a GitHub tarball" }, { "aheadOn": null, "also": [ "A hosted endpoint, with nothing to install" ], "goodFor": "Teams already buying from Together, and former CodeSandbox SDK users, who want Docker-defined sandboxes with disk and memory snapshots from Python or TypeScript.", "slug": "together-code-sandbox", "watchFor": "The SDK and CLI work only for organisations Together has enabled, and the docs say to contact Together for access" } ], "history": { "celesto": null, "together-code-sandbox": [ { "causes": [ "correction" ], "date": "2026-11-04", "delta": 0.9, "from": 53.8, "fromGrade": "D", "to": 54.7, "toGrade": "C" }, { "causes": [ "evidence" ], "date": "2026-10-28", "delta": 0.1, "from": 53.7, "fromGrade": "D", "to": 53.8, "toGrade": "D" }, { "causes": [ "method" ], "date": "2026-10-27", "delta": 0.1, "from": 53.6, "fromGrade": "D", "to": 53.7, "toGrade": "D" } ] }, "job": { "capability": "sandbox.code", "name": "Code sandboxes" }, "others": [ { "json": "https://www.anchorterminal.com/compare/agentcore-code-interpreter-vs-celesto.json", "title": "Amazon Bedrock AgentCore Code Interpreter vs Celesto (formerly SmolVM)", "url": "https://www.anchorterminal.com/compare/agentcore-code-interpreter-vs-celesto" }, { "json": "https://www.anchorterminal.com/compare/agentcore-code-interpreter-vs-together-code-sandbox.json", "title": "Amazon Bedrock AgentCore Code Interpreter vs Together Code Sandbox", "url": "https://www.anchorterminal.com/compare/agentcore-code-interpreter-vs-together-code-sandbox" }, { "json": "https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-celesto.json", "title": "Blaxel Sandboxes vs Celesto (formerly SmolVM)", "url": "https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-celesto" }, { "json": "https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-together-code-sandbox.json", "title": "Blaxel Sandboxes vs Together Code Sandbox", "url": "https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-together-code-sandbox" }, { "json": "https://www.anchorterminal.com/compare/celesto-vs-cloudflare-sandbox-sdk.json", "title": "Celesto (formerly SmolVM) vs Cloudflare Sandbox SDK", "url": "https://www.anchorterminal.com/compare/celesto-vs-cloudflare-sandbox-sdk" }, { "json": "https://www.anchorterminal.com/compare/celesto-vs-daytona.json", "title": "Celesto (formerly SmolVM) vs Daytona", "url": "https://www.anchorterminal.com/compare/celesto-vs-daytona" }, { "json": "https://www.anchorterminal.com/compare/celesto-vs-deltabox-lite.json", "title": "Celesto (formerly SmolVM) vs DeltaBox Lite", "url": "https://www.anchorterminal.com/compare/celesto-vs-deltabox-lite" }, { "json": "https://www.anchorterminal.com/compare/celesto-vs-deno-sandbox.json", "title": "Celesto (formerly SmolVM) vs Deno Sandbox", "url": "https://www.anchorterminal.com/compare/celesto-vs-deno-sandbox" }, { "json": "https://www.anchorterminal.com/compare/celesto-vs-e2b.json", "title": "Celesto (formerly SmolVM) vs E2B", "url": "https://www.anchorterminal.com/compare/celesto-vs-e2b" }, { "json": "https://www.anchorterminal.com/compare/celesto-vs-freestyle.json", "title": "Celesto (formerly SmolVM) vs Freestyle", "url": "https://www.anchorterminal.com/compare/celesto-vs-freestyle" }, { "json": "https://www.anchorterminal.com/compare/celesto-vs-instavm.json", "title": "Celesto (formerly SmolVM) vs InstaVM", "url": "https://www.anchorterminal.com/compare/celesto-vs-instavm" }, { "json": "https://www.anchorterminal.com/compare/celesto-vs-maritime.json", "title": "Celesto (formerly SmolVM) vs Maritime", "url": "https://www.anchorterminal.com/compare/celesto-vs-maritime" }, { "json": "https://www.anchorterminal.com/compare/celesto-vs-microsoft-execution-containers.json", "title": "Celesto (formerly SmolVM) vs Microsoft Execution Containers", "url": "https://www.anchorterminal.com/compare/celesto-vs-microsoft-execution-containers" }, { "json": "https://www.anchorterminal.com/compare/celesto-vs-modal-sandboxes.json", "title": "Celesto (formerly SmolVM) vs Modal Sandboxes", "url": "https://www.anchorterminal.com/compare/celesto-vs-modal-sandboxes" }, { "json": "https://www.anchorterminal.com/compare/celesto-vs-morph-cloud.json", "title": "Celesto (formerly SmolVM) vs Morph Cloud", "url": "https://www.anchorterminal.com/compare/celesto-vs-morph-cloud" }, { "json": "https://www.anchorterminal.com/compare/celesto-vs-offscreen.json", "title": "Celesto (formerly SmolVM) vs Offscreen", "url": "https://www.anchorterminal.com/compare/celesto-vs-offscreen" }, { "json": "https://www.anchorterminal.com/compare/celesto-vs-perplexity-space.json", "title": "Celesto (formerly SmolVM) vs SPACE", "url": "https://www.anchorterminal.com/compare/celesto-vs-perplexity-space" }, { "json": "https://www.anchorterminal.com/compare/celesto-vs-runloop.json", "title": "Celesto (formerly SmolVM) vs Runloop Devboxes", "url": "https://www.anchorterminal.com/compare/celesto-vs-runloop" }, { "json": "https://www.anchorterminal.com/compare/celesto-vs-sandbox0.json", "title": "Celesto (formerly SmolVM) vs Sandbox0", "url": "https://www.anchorterminal.com/compare/celesto-vs-sandbox0" }, { "json": "https://www.anchorterminal.com/compare/celesto-vs-sprites.json", "title": "Celesto (formerly SmolVM) vs Sprites", "url": "https://www.anchorterminal.com/compare/celesto-vs-sprites" }, { "json": "https://www.anchorterminal.com/compare/celesto-vs-vercel-sandbox.json", "title": "Celesto (formerly SmolVM) vs Vercel Sandbox", "url": "https://www.anchorterminal.com/compare/celesto-vs-vercel-sandbox" }, { "json": "https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-together-code-sandbox.json", "title": "Cloudflare Sandbox SDK vs Together Code Sandbox", "url": "https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-together-code-sandbox" }, { "json": "https://www.anchorterminal.com/compare/daytona-vs-together-code-sandbox.json", "title": "Daytona vs Together Code Sandbox", "url": "https://www.anchorterminal.com/compare/daytona-vs-together-code-sandbox" }, { "json": "https://www.anchorterminal.com/compare/deno-sandbox-vs-together-code-sandbox.json", "title": "Deno Sandbox vs Together Code Sandbox", "url": "https://www.anchorterminal.com/compare/deno-sandbox-vs-together-code-sandbox" }, { "json": "https://www.anchorterminal.com/compare/e2b-vs-together-code-sandbox.json", "title": "E2B vs Together Code Sandbox", "url": "https://www.anchorterminal.com/compare/e2b-vs-together-code-sandbox" }, { "json": "https://www.anchorterminal.com/compare/freestyle-vs-together-code-sandbox.json", "title": "Freestyle vs Together Code Sandbox", "url": "https://www.anchorterminal.com/compare/freestyle-vs-together-code-sandbox" }, { "json": "https://www.anchorterminal.com/compare/instavm-vs-together-code-sandbox.json", "title": "InstaVM vs Together Code Sandbox", "url": "https://www.anchorterminal.com/compare/instavm-vs-together-code-sandbox" }, { "json": "https://www.anchorterminal.com/compare/maritime-vs-together-code-sandbox.json", "title": "Maritime vs Together Code Sandbox", "url": "https://www.anchorterminal.com/compare/maritime-vs-together-code-sandbox" }, { "json": "https://www.anchorterminal.com/compare/microsoft-execution-containers-vs-together-code-sandbox.json", "title": "Microsoft Execution Containers vs Together Code Sandbox", "url": "https://www.anchorterminal.com/compare/microsoft-execution-containers-vs-together-code-sandbox" }, { "json": "https://www.anchorterminal.com/compare/modal-sandboxes-vs-together-code-sandbox.json", "title": "Modal Sandboxes vs Together Code Sandbox", "url": "https://www.anchorterminal.com/compare/modal-sandboxes-vs-together-code-sandbox" }, { "json": "https://www.anchorterminal.com/compare/morph-cloud-vs-together-code-sandbox.json", "title": "Morph Cloud vs Together Code Sandbox", "url": "https://www.anchorterminal.com/compare/morph-cloud-vs-together-code-sandbox" }, { "json": "https://www.anchorterminal.com/compare/offscreen-vs-together-code-sandbox.json", "title": "Offscreen vs Together Code Sandbox", "url": "https://www.anchorterminal.com/compare/offscreen-vs-together-code-sandbox" }, { "json": "https://www.anchorterminal.com/compare/perplexity-space-vs-together-code-sandbox.json", "title": "SPACE vs Together Code Sandbox", "url": "https://www.anchorterminal.com/compare/perplexity-space-vs-together-code-sandbox" }, { "json": "https://www.anchorterminal.com/compare/runloop-vs-together-code-sandbox.json", "title": "Runloop Devboxes vs Together Code Sandbox", "url": "https://www.anchorterminal.com/compare/runloop-vs-together-code-sandbox" }, { "json": "https://www.anchorterminal.com/compare/sandbox0-vs-together-code-sandbox.json", "title": "Sandbox0 vs Together Code Sandbox", "url": "https://www.anchorterminal.com/compare/sandbox0-vs-together-code-sandbox" }, { "json": "https://www.anchorterminal.com/compare/sprites-vs-together-code-sandbox.json", "title": "Sprites vs Together Code Sandbox", "url": "https://www.anchorterminal.com/compare/sprites-vs-together-code-sandbox" }, { "json": "https://www.anchorterminal.com/compare/together-code-sandbox-vs-vercel-sandbox.json", "title": "Together Code Sandbox vs Vercel Sandbox", "url": "https://www.anchorterminal.com/compare/together-code-sandbox-vs-vercel-sandbox" }, { "json": "https://www.anchorterminal.com/compare/agent37-vs-celesto.json", "title": "Agent 37 Cloud vs Celesto (formerly SmolVM)", "url": "https://www.anchorterminal.com/compare/agent37-vs-celesto" }, { "json": "https://www.anchorterminal.com/compare/agent37-vs-together-code-sandbox.json", "title": "Agent 37 Cloud vs Together Code Sandbox", "url": "https://www.anchorterminal.com/compare/agent37-vs-together-code-sandbox" }, { "json": "https://www.anchorterminal.com/compare/deltabox-lite-vs-together-code-sandbox.json", "title": "DeltaBox Lite vs Together Code Sandbox", "url": "https://www.anchorterminal.com/compare/deltabox-lite-vs-together-code-sandbox" } ], "panel": null, "scores": [ { "by": 34, "celesto": 66, "edge": "celesto", "key": "reliability", "name": "Reliability", "together-code-sandbox": 32, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 1, "celesto": 85, "edge": "together-code-sandbox", "key": "schema", "name": "Schema \u0026 documentation", "together-code-sandbox": 86, "weight": 13 }, { "by": 1, "celesto": 69, "edge": "together-code-sandbox", "key": "ergonomics", "name": "Agent ergonomics", "together-code-sandbox": 70, "weight": 13 }, { "by": 6, "celesto": 52, "edge": "celesto", "key": "security", "name": "Security \u0026 auth", "together-code-sandbox": 46, "weight": 14 }, { "by": 40, "celesto": 60, "edge": "celesto", "key": "payments", "name": "Payments \u0026 pricing", "together-code-sandbox": 20, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 2, "celesto": 81, "edge": "together-code-sandbox", "key": "maintenance", "name": "Maintenance \u0026 community", "together-code-sandbox": 83, "weight": 7 }, { "by": 11, "celesto": 70, "edge": "celesto", "key": "transparency", "name": "Transparency \u0026 trust", "together-code-sandbox": 59, "weight": 7 } ], "summary": "Celesto (formerly SmolVM) scores 68 (B) on agent readiness against Together Code Sandbox's 54.7 (C), and leads in 4 of 7 scored categories. Both do code sandboxes.", "tasks": null, "tutorials": [], "verdicts": { "celesto": "Celesto runs each agent task in a local Firecracker or QEMU microVM with its own kernel, driven by a CLI with a stable JSON envelope and a Python SDK, free under Apache-2.0. It is pre-1.0, renamed from SmolVM on 19 September 2026, sends usage telemetry after a first-use notice, and leaves outbound networking open unless a mode is set.", "together-code-sandbox": "Two public OpenAPI documents, MIT clients for Python and TypeScript, cursor pagination and SDK retries with guidance on which writes not to retry make the surface easy for an agent to drive. Access is the limit. Together enables the SDK per organisation on request, publishes no rate limits or SLA, and its status page has no sandbox component." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/celesto-vs-together-code-sandbox", "json": "https://www.anchorterminal.com/compare/celesto-vs-together-code-sandbox.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/celesto-vs-together-code-sandbox.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/celesto-vs-together-code-sandbox.min.md" }, "markdown": "Celesto (formerly SmolVM) scores 68 (B) on agent readiness against Together Code Sandbox's 54.7 (C), and leads in 4 of 7 scored categories. Both do code sandboxes.\n\n- Celesto (formerly SmolVM): grade B, 68/100, rank #298 of 1486. Markdown https://www.anchorterminal.com/tools/celesto.md · JSON https://www.anchorterminal.com/api/v1/tools/celesto.json\n- Together Code Sandbox: grade C, 54.7/100, rank #896 of 1486. Markdown https://www.anchorterminal.com/tools/together-code-sandbox.md · JSON https://www.anchorterminal.com/api/v1/tools/together-code-sandbox.json\n- Best code execution sandboxes for AI agents: https://www.anchorterminal.com/best/code-sandboxes/index.md\n- All 231 sandboxes comparisons: https://www.anchorterminal.com/compare/code-sandboxes/index.md\n\n## Which one, for what\n\n### Celesto (formerly SmolVM) (B)\n\nGood for: Local microVM sandboxes for agent code, browsers and desktops on Linux and macOS, with a path to a hosted cloud.\n\nAhead on:\n- Reliability, 66 against 32\n- Security \u0026 auth, 52 against 46\n- Payments \u0026 pricing, 60 against 20\n- Transparency \u0026 trust, 70 against 59\n\nAlso in its favour:\n- No key needed to call it\n- Free to start without a card\n- Open source\n\nWatch for: Version 0.1.13 and declared pre-1.0 in SECURITY.md, with the TypeScript SDK an alpha installed from a GitHub tarball\n\n### Together Code Sandbox (C)\n\nGood for: Teams already buying from Together, and former CodeSandbox SDK users, who want Docker-defined sandboxes with disk and memory snapshots from Python or TypeScript.\n\nAlso in its favour:\n- A hosted endpoint, with nothing to install\n\nWatch for: The SDK and CLI work only for organisations Together has enabled, and the docs say to contact Together for access\n\n\n## Why the edge\n\n### Payments \u0026 pricing: Celesto (formerly SmolVM) +40\n\n- Celesto (formerly SmolVM) (60): Read with the self-hosted rule, scoring the hosted option for the price lines. No x402, MPP or L402 (0 of 40). Celesto Cloud publishes hourly prices for six sizes without a login (20). A one-time $5 Micro credit needs no card, and the local SDK is free (20). The graded local SDK installs from PyPI and runs with no account, so an agent needs no signup (20). Cloud use needs a browser signup and a card top-up. Total 60.\n- Together Code Sandbox (20): No x402, MPP or L402 found (0). The pricing page still lists Code Sandbox at $0.0446 per vCPU-hour and $0.0149 per GiB of RAM per hour without a login, and does not say whether the rate covers the new SDK as well as the legacy one (20). The billing docs say Together has no free trial and that platform access needs a minimum $15 credit purchase (0). Access needs a browser signup, a payment and a request to Together to enable the organisation (0). 0 + 20 + 0 + 0 = 20.\n\n### Reliability: Celesto (formerly SmolVM) +34\n\n- Celesto (formerly SmolVM) (66): Read with the local-software lines, because the graded surface runs on the owner's machine. Installs from PyPI as `celesto` with Python 3.11 or newer on Linux and macOS stated, plus an install script (20). The repository has pytest, e2e, lint, TypeScript and smoke-test workflows and 38 test packages, but GitHub's API answered with a rate limit, so no run result was read (15 of 25, unchecked). 22 open issues and pull requests against about 188 commits in 90 days. The open bugs include a snapshot restore that can lose a VM's disk if interrupted and a thread-safety issue with five replies (18 of 25). A dated changelog with Security, Fixed, Added and Removed sections, and the rename to Celesto marked as a breaking release, though versions stay below 1.0 (13 of 15). Pre-1.0 per SECURITY.md (0). Total 66.\n- Together Code Sandbox (32): Read with the hosted lines. status.together.ai lists the website, the playground and inference models with no component for the sandbox service, and a vendor status page with no component for the product takes 15. Incident line kept at 5. The Together page posts no incident since 6 January 2025, while status.codesandbox.io, which lists the CodeSandbox API and two clusters, wasn't re-read on 4 November (codesandbox.io answers a bot check, so its terms are unread), per the 8 October check (5). No rate or concurrency limits found, and the migration guide says the concurrency count and limit are not exposed (0). Both SDKs retry 408, 429, 500, 502, 503 and 504 three times with exponential backoff from 0.5 seconds plus jitter, and the SDK references say `snapshots.create` is not idempotent and should be excluded from retries. That is safe-retry guidance with no idempotency keys (12). No SLA found, and the terms make no uptime guarantee outside an order form (0). The docs still say the SDK must be enabled for an organisation, on request to sales, which is not general availability (0). 15 + 5 + 0 + 12 + 0 + 0 = 32.\n\n### Transparency \u0026 trust: Celesto (formerly SmolVM) +11\n\n- Celesto (formerly SmolVM) (70): Apache-2.0 in LICENSE and on PyPI (30). The privacy policy of 30 October 2026 links a subprocessor registry and describes the CLI telemetry in the same terms as the docs, but gives no retention periods beyond as long as necessary. Stopped cloud disks are kept 30 days per the pricing page (18 of 30). The changelog marks removals and the breaking rename, and the glossary lists older names still accepted, with no written deprecation policy (10 of 20). Telemetry is disclosed in the README, CLI reference and privacy policy, with three opt-outs, but it is on by default after the notice (16 of 20). Total 74.\n- Together Code Sandbox (59): A closed service under Together's terms of service (19 May 2026). The SDKs, CLI and OpenAPI documents are MIT, which doesn't raise the line for a closed API, as for the Together inference and fine-tuning listings (15). The privacy policy (17 December 2025) says data is not used for training without opt-in. Its table of data types covers inference, fine-tuning and GPU clusters with no sandbox row, and no retention period for sandbox filesystems or snapshots was found beyond an optional snapshot `ttl` (12). The legacy `@codesandbox/sdk` page is still marked deprecated with no end date, the deprecations page covers models only, and breaking SDK changes are marked in the changelog. Kept as a partial (8). No sub-processor list or data locations for sandboxes found. A docs example names a cluster `na-us-ce-01`, and the trust centre was unread (3). 15 + 12 + 8 + 3 = 38.\n\n### Security \u0026 auth: Celesto (formerly SmolVM) +6\n\n- Celesto (formerly SmolVM) (52): Framework reading for local software. No credential is needed for local use, and the local API server and dashboard each require a bearer token, and cloud keys carry named permissions (22 of 30). Each computer has its own guest kernel, browser and display access uses capability URLs with a read-only option, and raw VNC is off. Against that, outbound networking is open by default and the restricting modes are opt-in (12 of 20). The security doc warns against giving connection URLs to a model as page content, but there is no guidance on treating command or page output as untrusted (5 of 15). `computer logs` shows startup output, with no audit log of commands (5 of 15). SECURITY.md with GitHub private vulnerability reporting and a supported-versions table, Security sections in the changelog, no security.txt, bug bounty or certification (8 of 20). Total 52.\n- Together Code Sandbox (46): Project-scoped API keys, revocable within about five minutes, with optional expiry and rotation guidance, read as the Together inference and fine-tuning listings read the same key model (30). The in-VM OpenAPI document still lists `?token=` as a documented way to authenticate the WebSocket exec path, so the checklist's fixed 10 comes off (20). Each sandbox is a virtual machine. Every port is open to everyone unless the experimental inbound policy is set, no outbound rules exist, and project roles are admin and editor with no read-only role (8). The sandbox returns the output of code the agent ran, with no guidance on untrusted output found (8). Sandboxes can be listed with tags and `status_reason`. No audit log found (3). A PGP-signed security.txt (Expires 2028-09-30) points Contact and Policy at HackerOne with no acknowledgement time, the value this run gives a disclosure route with no stated time (7). 20 + 8 + 8 + 3 + 7 = 46.\n\n## Score by category\n\n| Category | Weight | Celesto (formerly SmolVM) | Together Code Sandbox | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 66 | 32 | Celesto (formerly SmolVM) +34 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 85 | 86 | Together Code Sandbox +1 |\n| Agent ergonomics | 13% (16.2 this run) | 69 | 70 | Together Code Sandbox +1 |\n| Security \u0026 auth | 14% (17.5 this run) | 52 | 46 | Celesto (formerly SmolVM) +6 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 60 | 20 | Celesto (formerly SmolVM) +40 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 81 | 83 | Together Code Sandbox +2 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 70 | 59 | Celesto (formerly SmolVM) +11 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **68 · B** | **54.7 · C** | |\n\n## Facts side by side\n\n| Fact | Celesto (formerly SmolVM) | Together Code Sandbox |\n| --- | --- | --- |\n| Kind | SDK + MCP | HTTP API |\n| Vendor | Celesto AI, Inc. | Together AI |\n| Hosted endpoint | no (local only) | `https://api.bartender.codesandbox.io` |\n| Transports | | HTTP |\n| Auth | None | API key |\n| Pricing | Freemium | Pay per use |\n| x402 | no | no |\n| Licence | Apache-2.0 | Proprietary service under Together's terms of service. The SDKs, CLI and OpenAPI documents on GitHub are MIT |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-11-05 | 2026-10-07 |\n| Terms last updated | 2026-10-30 | no date given |\n| Privacy policy last updated | 2026-10-30 | no date given |\n| Customer content may train models | not found in the text | not found in the text |\n| Terms restrict automated access | not found in the text | not found in the text |\n| Terms restrict benchmarking | not found in the text | yes |\n| Terms or service can change without notice | not found in the text | not found in the text |\n| Arbitration or class-action waiver | not found in the text | not found in the text |\n| Popularity | 1.1k stars, 699 PyPI/wk | 3 stars, 1.3k npm/wk |\n\n## How the scores have moved\n\n### Celesto (formerly SmolVM)\n\nNo score change since it was listed.\n\n### Together Code Sandbox\n\n- +0.9 on 4 November 2026 (D to C): correction\n- +0.1 on 28 October 2026: new evidence\n- +0.1 on 27 October 2026: checklist\n\n## Verdicts\n\n**Celesto (formerly SmolVM).** Celesto runs each agent task in a local Firecracker or QEMU microVM with its own kernel, driven by a CLI with a stable JSON envelope and a Python SDK, free under Apache-2.0. It is pre-1.0, renamed from SmolVM on 19 September 2026, sends usage telemetry after a first-use notice, and leaves outbound networking open unless a mode is set.\n\n**Together Code Sandbox.** Two public OpenAPI documents, MIT clients for Python and TypeScript, cursor pagination and SDK retries with guidance on which writes not to retry make the surface easy for an agent to drive. Access is the limit. Together enables the SDK per organisation on request, publishes no rate limits or SLA, and its status page has no sandbox component.\n\n## Before you call either\n\n### Celesto (formerly SmolVM)\n\n1. Pass `--json` to every `celesto` command and branch on `ok` and `exit_code`, not on printed text\n2. Create computers with unique names and delete them by exact name when the job ends, including after failures\n3. Set `internet_settings={\"mode\": \"off\"}` or `restricted` for untrusted code, since the default is open\n4. Set CELESTO_NO_TELEMETRY=1 in unattended runs if usage events must not leave the machine\n5. Never paste browser or display connection URLs into model context; possession of the URL grants control\n\n### Together Code Sandbox\n\n1. Confirm the organisation is on Together's allowlist before installing. A valid `TOGETHER_API_KEY` alone is not enough\n2. Build a snapshot first with `snapshots.create`. No default image exists, and every sandbox needs `snapshot_id` or `snapshot_alias`\n3. Set `ttl` at creation or call `terminate()`. Nothing stops a sandbox otherwise, and closing the Python client leaves it running\n4. Store the snapshot alias, not the sandbox ID. A terminated sandbox can't restart, and its state lives at `sandbox:\u003cid\u003e`\n5. Exclude `snapshots.create` from retries with `should_retry`, and set `experimental.network_policy` before serving anything private on a port\n\n## Questions\n\n### Which is better for AI agents, Celesto (formerly SmolVM) or Together Code Sandbox?\n\nCelesto (formerly SmolVM) scores 68 (B) on agent readiness against Together Code Sandbox's 54.7 (C), and leads in 4 of 7 scored categories.\n\n### Can an agent call Celesto (formerly SmolVM) and Together Code Sandbox without installing anything?\n\nNo hosted endpoint is listed for Celesto (formerly SmolVM). Together Code Sandbox has a hosted endpoint at https://api.bartender.codesandbox.io.\n\n### Are Celesto (formerly SmolVM) and Together Code Sandbox open source?\n\nCelesto (formerly SmolVM) is open source (Apache-2.0). No open-source release is listed for Together Code Sandbox.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/celesto-vs-together-code-sandbox.json, and with the fewest tokens: https://www.anchorterminal.com/compare/celesto-vs-together-code-sandbox.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"celesto\", \"b\": \"together-code-sandbox\"}`. From a terminal: `anchor compare celesto together-code-sandbox`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/celesto.json and https://www.anchorterminal.com/api/v1/tools/together-code-sandbox.json\n\n## Other comparisons with Celesto (formerly SmolVM) or Together Code Sandbox\n\n- [Amazon Bedrock AgentCore Code Interpreter vs Celesto (formerly SmolVM)](https://www.anchorterminal.com/compare/agentcore-code-interpreter-vs-celesto.md)\n- [Amazon Bedrock AgentCore Code Interpreter vs Together Code Sandbox](https://www.anchorterminal.com/compare/agentcore-code-interpreter-vs-together-code-sandbox.md)\n- [Blaxel Sandboxes vs Celesto (formerly SmolVM)](https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-celesto.md)\n- [Blaxel Sandboxes vs Together Code Sandbox](https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-together-code-sandbox.md)\n- [Celesto (formerly SmolVM) vs Cloudflare Sandbox SDK](https://www.anchorterminal.com/compare/celesto-vs-cloudflare-sandbox-sdk.md)\n- [Celesto (formerly SmolVM) vs Daytona](https://www.anchorterminal.com/compare/celesto-vs-daytona.md)\n- [Celesto (formerly SmolVM) vs DeltaBox Lite](https://www.anchorterminal.com/compare/celesto-vs-deltabox-lite.md)\n- [Celesto (formerly SmolVM) vs Deno Sandbox](https://www.anchorterminal.com/compare/celesto-vs-deno-sandbox.md)\n- [Celesto (formerly SmolVM) vs E2B](https://www.anchorterminal.com/compare/celesto-vs-e2b.md)\n- [Celesto (formerly SmolVM) vs Freestyle](https://www.anchorterminal.com/compare/celesto-vs-freestyle.md)\n- [Celesto (formerly SmolVM) vs InstaVM](https://www.anchorterminal.com/compare/celesto-vs-instavm.md)\n- [Celesto (formerly SmolVM) vs Maritime](https://www.anchorterminal.com/compare/celesto-vs-maritime.md)\n- [Celesto (formerly SmolVM) vs Microsoft Execution Containers](https://www.anchorterminal.com/compare/celesto-vs-microsoft-execution-containers.md)\n- [Celesto (formerly SmolVM) vs Modal Sandboxes](https://www.anchorterminal.com/compare/celesto-vs-modal-sandboxes.md)\n- [Celesto (formerly SmolVM) vs Morph Cloud](https://www.anchorterminal.com/compare/celesto-vs-morph-cloud.md)\n- [Celesto (formerly SmolVM) vs Offscreen](https://www.anchorterminal.com/compare/celesto-vs-offscreen.md)\n- [Celesto (formerly SmolVM) vs SPACE](https://www.anchorterminal.com/compare/celesto-vs-perplexity-space.md)\n- [Celesto (formerly SmolVM) vs Runloop Devboxes](https://www.anchorterminal.com/compare/celesto-vs-runloop.md)\n- [Celesto (formerly SmolVM) vs Sandbox0](https://www.anchorterminal.com/compare/celesto-vs-sandbox0.md)\n- [Celesto (formerly SmolVM) vs Sprites](https://www.anchorterminal.com/compare/celesto-vs-sprites.md)\n- [Celesto (formerly SmolVM) vs Vercel Sandbox](https://www.anchorterminal.com/compare/celesto-vs-vercel-sandbox.md)\n- [Cloudflare Sandbox SDK vs Together Code Sandbox](https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-together-code-sandbox.md)\n- [Daytona vs Together Code Sandbox](https://www.anchorterminal.com/compare/daytona-vs-together-code-sandbox.md)\n- [Deno Sandbox vs Together Code Sandbox](https://www.anchorterminal.com/compare/deno-sandbox-vs-together-code-sandbox.md)\n- [E2B vs Together Code Sandbox](https://www.anchorterminal.com/compare/e2b-vs-together-code-sandbox.md)\n- [Freestyle vs Together Code Sandbox](https://www.anchorterminal.com/compare/freestyle-vs-together-code-sandbox.md)\n- [InstaVM vs Together Code Sandbox](https://www.anchorterminal.com/compare/instavm-vs-together-code-sandbox.md)\n- [Maritime vs Together Code Sandbox](https://www.anchorterminal.com/compare/maritime-vs-together-code-sandbox.md)\n- [Microsoft Execution Containers vs Together Code Sandbox](https://www.anchorterminal.com/compare/microsoft-execution-containers-vs-together-code-sandbox.md)\n- [Modal Sandboxes vs Together Code Sandbox](https://www.anchorterminal.com/compare/modal-sandboxes-vs-together-code-sandbox.md)\n- [Morph Cloud vs Together Code Sandbox](https://www.anchorterminal.com/compare/morph-cloud-vs-together-code-sandbox.md)\n- [Offscreen vs Together Code Sandbox](https://www.anchorterminal.com/compare/offscreen-vs-together-code-sandbox.md)\n- [SPACE vs Together Code Sandbox](https://www.anchorterminal.com/compare/perplexity-space-vs-together-code-sandbox.md)\n- [Runloop Devboxes vs Together Code Sandbox](https://www.anchorterminal.com/compare/runloop-vs-together-code-sandbox.md)\n- [Sandbox0 vs Together Code Sandbox](https://www.anchorterminal.com/compare/sandbox0-vs-together-code-sandbox.md)\n- [Sprites vs Together Code Sandbox](https://www.anchorterminal.com/compare/sprites-vs-together-code-sandbox.md)\n- [Together Code Sandbox vs Vercel Sandbox](https://www.anchorterminal.com/compare/together-code-sandbox-vs-vercel-sandbox.md)\n- [Agent 37 Cloud vs Celesto (formerly SmolVM)](https://www.anchorterminal.com/compare/agent37-vs-celesto.md)\n- [Agent 37 Cloud vs Together Code Sandbox](https://www.anchorterminal.com/compare/agent37-vs-together-code-sandbox.md)\n- [DeltaBox Lite vs Together Code Sandbox](https://www.anchorterminal.com/compare/deltabox-lite-vs-together-code-sandbox.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "attributionRequired": true, "credit": "CC BY 4.0, credit Anchor Terminal and link the page or API address you took it from (https://www.anchorterminal.com/terms/#data)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-11-07", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.7", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run", "terms": "https://www.anchorterminal.com/terms/#data" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Celesto (formerly SmolVM) vs Together Code Sandbox", "url": "" } ], "description": "Celesto scores 68 (B) to Together Code Sandbox's 54.7 (C) for code sandboxes. Prices, MCP, x402, uptime and agent notes side by side.", "facts": [ "Celesto (formerly SmolVM) B 68", "Together Code Sandbox C 54.7", "scores" ], "h1": "Celesto (formerly SmolVM) vs Together Code Sandbox", "image": "https://www.anchorterminal.com/assets/og/default.png", "path": "/compare/celesto-vs-together-code-sandbox", "published": "2026-10-01", "section": "tools", "title": "Celesto vs Together Code Sandbox for AI agents (2026)", "toc": null, "updated": "2026-11-07", "url": "https://www.anchorterminal.com/compare/celesto-vs-together-code-sandbox" }, "tokens": { "markdown": 4900, "slim": 2280 }, "version": 1 }