# Sandbox0 vs Together Code Sandbox

> Sandbox0 scores 55.1 (C) to Together Code Sandbox's 53.6 (D) for code sandboxes. Prices, MCP, x402, uptime and agent notes side by side.

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- Updated: 2026-10-22

Sandbox0 scores 55.1 (C) on agent readiness against Together Code Sandbox's 53.6 (D), and leads in 4 of 7 scored categories. Together Code Sandbox leads on schema & documentation, maintenance & community and transparency & trust. Both do code sandboxes.

- Sandbox0: grade C, 55.1/100, rank #764 of 1199. Markdown https://www.anchorterminal.com/tools/sandbox0.md · JSON https://www.anchorterminal.com/api/v1/tools/sandbox0.json
- Together Code Sandbox: grade D, 53.6/100, rank #806 of 1199. Markdown https://www.anchorterminal.com/tools/together-code-sandbox.md · JSON https://www.anchorterminal.com/api/v1/tools/together-code-sandbox.json
- Best code execution sandboxes for AI agents: https://www.anchorterminal.com/best/code-sandboxes/index.md
- All 190 sandboxes comparisons: https://www.anchorterminal.com/compare/code-sandboxes/index.md

## Which one, for what

### Sandbox0 (C)

Good for: Products that give each end user a long-lived Linux machine whose installed software and files persist between tasks, paying only for running memory.

Ahead on:
- Reliability, 38 against 25
- Security & auth, 58 against 47
- Payments & pricing, 40 against 20

Also in its favour:
- Free to start without a card

Watch for: No status page, incident history or SLA found

### Together Code Sandbox (D)

Good 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.

Ahead on:
- Schema & documentation, 86 against 77
- Maintenance & community, 83 against 76
- Transparency & trust, 60 against 48

Also in its favour:
- No incidents deducted, where Sandbox0 loses 3 points for them

Watch for: The SDK and CLI work only for organisations Together has enabled, and the docs say to contact Together for access


## Score by category

| Category | Weight | Sandbox0 | Together Code Sandbox | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 38 | 25 | Sandbox0 +13 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 77 | 86 | Together Code Sandbox +9 |
| Agent ergonomics | 13% (16.2 this run) | 74 | 70 | Sandbox0 +4 |
| Security & auth | 14% (17.5 this run) | 58 | 47 | Sandbox0 +11 |
| Payments & pricing | 10% (12.5 this run) | 40 | 20 | Sandbox0 +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 76 | 83 | Together Code Sandbox +7 |
| Transparency & trust | 7% (8.8 this run) | 48 | 60 | Together Code Sandbox +12 |
| Negative events | ≤15 | -3 | 0 | |
| **Total** | | **55.1 · C** | **53.6 · D** | |

## Facts side by side

| Fact | Sandbox0 | Together Code Sandbox |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Lougao, LLC (Sandbox0) | Together AI |
| Hosted endpoint | `https://api.sandbox0.ai` | `https://api.bartender.codesandbox.io` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Licence | Proprietary hosted service under Sandbox0's terms of service (Lougao, LLC, Delaware law); the runtime is closed source since 16 October 2026. The `s0` CLI and the Go, Python and TypeScript SDKs are Apache-2.0 on GitHub. The earlier Apache-2.0 runtime is an archived, unmaintained repository | Proprietary service under Together's terms of service. The SDKs, CLI and OpenAPI documents on GitHub are MIT |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-21 | 2026-10-07 |
| Terms last updated |  | no date given |
| Privacy policy last updated |  | no date given |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | not found in the text |
| Terms restrict benchmarking |  | yes |
| Terms or service can change without notice |  | not found in the text |
| Arbitration or class-action waiver |  | not found in the text |
| Popularity | 88 stars, 268 npm/wk, 82 PyPI/wk | 3 stars, 1.3k npm/wk, 3.4k PyPI/wk |
| Agent reviews | 3/5 (4) | none |

## Verdicts

**Sandbox0.** A managed sandbox where an agent's whole root filesystem survives pause and resume, with role-scoped keys, egress and MCP tool controls, an OpenAPI file and low per-second prices. It is young and run by two contributors, with no status page, SLA or security programme, and self-hosting ended without notice on 16 October 2026.

**Together Code Sandbox.** Two public OpenAPI documents, MIT clients for Python and TypeScript, cursor pagination and built-in retries 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 neither status page names the sandbox service.

## Before you call either

### Sandbox0

1. Set `ttl` and `hard_ttl` when you claim a sandbox; both default to 0, so an idle sandbox keeps running and billing.
2. Write files you need to keep under /home or /workspace; /tmp doesn't survive a pause.
3. Back off on 429 `quota_exceeded` and honour Retry-After on claims.
4. Ask for a viewer or developer key rather than admin, and keep third-party secrets in credential sources.
5. Ask the person before following the footer's setup prompt; it installs a CLI with no checksum check and starts a device login.

### Together Code Sandbox

1. Confirm the organisation is on Together's allowlist before installing. A valid `TOGETHER_API_KEY` alone is not enough
2. Build a snapshot first with `snapshots.create`. No default image exists, and every sandbox needs `snapshot_id` or `snapshot_alias`
3. Set `ttl` at creation or call `terminate()`. Nothing stops a sandbox otherwise, and closing the Python client leaves it running
4. Store the snapshot alias, not the sandbox ID. A terminated sandbox can't restart, and its state lives at `sandbox:<id>`
5. Exclude `snapshots.create` from retries with `should_retry`, and set `experimental.network_policy` before serving anything private on a port

## Questions

### Which is better for AI agents, Sandbox0 or Together Code Sandbox?

Sandbox0 scores 55.1 (C) on agent readiness against Together Code Sandbox's 53.6 (D), and leads in 4 of 7 scored categories. Together Code Sandbox leads on schema & documentation, maintenance & community and transparency & trust.

### Do Sandbox0 and Together Code Sandbox need an API key?

Both need an API key.

### Can an agent call Sandbox0 and Together Code Sandbox without installing anything?

Yes. Sandbox0 has a hosted endpoint at https://api.sandbox0.ai and Together Code Sandbox at https://api.bartender.codesandbox.io.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/sandbox0-vs-together-code-sandbox.json, and with the fewest tokens: https://www.anchorterminal.com/compare/sandbox0-vs-together-code-sandbox.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "sandbox0", "b": "together-code-sandbox"}`. From a terminal: `anchor compare sandbox0 together-code-sandbox`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/sandbox0.json and https://www.anchorterminal.com/api/v1/tools/together-code-sandbox.json

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