{ "data": { "a": { "slug": "openai-agents-api", "name": "OpenAI Agents API", "vendor": "OpenAI", "vendorUrl": "https://openai.com/index/introducing-the-agents-api/", "kind": "http-api", "category": "agent-harnesses", "summary": "The OpenAI Agents API runs OpenAI's managed Codex harness as a hosted service. One call creates a session with a model, tools, MCP servers, subagents and an OpenAI-hosted or self-hosted sandbox, and OpenAI runs the loop.", "url": "https://www.anchorterminal.com/tools/openai-agents-api", "markdownUrl": "https://www.anchorterminal.com/tools/openai-agents-api.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/openai-agents-api.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/openai-agents-api.json", "dns": "openai-agents-api.grade.anchorterminal.com", "license": "Proprietary hosted API under OpenAI's Services Agreement. The SDKs are Apache 2.0", "transports": [ "https" ], "remoteUrl": "https://api.openai.com/v1/agents/sessions", "packages": [ { "registry": "pypi", "name": "openai" }, { "registry": "npm", "name": "openai" } ], "auth": "api-key", "authNotes": "An OpenAI project API key as a Bearer token, with the header `OpenAI-Beta: agents=v1`. Project keys can be restricted per endpoint or read-only, and service accounts and workload identity federation are available, per the openai-api listing. Signing up and creating a key need a person in a browser.", "pricing": "usage", "pricingNotes": "No fee for the API itself. Model tokens are billed at the chosen model's API rates, OpenAI tools at their built-in rates (web search $10.00 per 1,000 calls plus content tokens), and OpenAI-hosted sandboxes at container rates, $0.03 for 1 GB, $0.12 for 4 GB, $0.48 for 16 GB and $1.92 for 64 GB per 20-minute session, billed by the minute with a 5-minute minimum. Since 9 October sandbox compute is billed only during active turns (checked 2026-11-06).", "priceSummary": "Pay per use", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the Agents API guides or on OpenAI's pricing page; billing is to an OpenAI account (checked 2026-11-06).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-11-06" }, "docsUrl": "https://developers.openai.com/api/docs/guides/agents-api/overview", "llmsTxt": "https://developers.openai.com/api/docs/llms.txt", "capabilities": [ "agent.harness" ], "tags": [ "official", "hosted", "beta", "usage-priced", "llms-txt", "status-page", "mcp-client", "sandbox", "subagents", "webhooks", "soc2", "iso27001", "bug-bounty" ], "lastRelease": "2026-10-16", "graded": true, "anchor": { "graded": true, "score": 73.3, "grade": "BB", "agentReady": true, "rank": 99, "ranked": true, "rankOf": 1354, "categoryRank": 2, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 80, "maintenance": 87, "payments": 30, "reliability": 60, "schema": 88, "security": 87, "transparency": 85 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-06" }, "negative": 0, "verdict": "OpenAI's hosted agent runtime, the Codex harness behind one session call, with MCP, functions, web search, computer use, subagents and sandboxes on OpenAI or your own infrastructure. Documentation, errors and SDKs are thorough. It's still public beta, can't use Zero Data Retention and keeps data in the United States only.", "bestFor": "Teams that want OpenAI to run the agent loop, with sandboxes, MCP tools and subagents, and are fine with a beta API, US-only data residency and no Zero Data Retention.", "strengths": [ "One session call configures the model, tools, MCP servers, subagents and the sandbox, and OpenAI runs and recovers the loop", "Sandboxes on OpenAI or self-hosted, with guides for ten providers including E2B, Daytona, Modal, Cloudflare and Vercel", "An errors guide with codes per status and turn, Retry-After and a check-before-retry procedure", "Webhooks, streamed events, tracing and usage views for each session", "SDK examples in Python, JavaScript, Go, Java and Ruby", "Status page with its own Agents component" ], "weaknesses": [ "Public beta since 10 September 2026 behind the agents=v1 beta header, with no GA date", "Not eligible for Zero Data Retention, and data residency is United States only", "No idempotency key for session or turn requests; retries depend on checking state first", "One API-wide major outage on 29 September included it, plus several smaller incidents since release", "No retention period stated for published artifacts after a sandbox expires" ], "agentNotes": [ "POST https://api.openai.com/v1/agents/sessions with a project key and the header OpenAI-Beta: agents=v1, or use client.beta.agents in the SDKs", "Before retrying, retrieve the session and turn and check which actions completed, since there's no idempotency key", "Set the sandbox network to restricted with an allowlist of up to 100 hosts when the agent doesn't need the open web", "Save files from /workspace/outputs before deleting a session; no retention period is stated for artifacts", "Don't send data that needs Zero Data Retention or non-US residency; the Agents API supports neither" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "BB", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 73.3 } ], "editorialScores": { "ergonomics": 80, "maintenance": 87, "payments": 30, "reliability": 60, "schema": 88, "security": 87, "transparency": 75 }, "provenanceScore": 95, "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": { "http": "curl https://api.openai.com/v1/agents/sessions \\\n -H \"Authorization: Bearer $OPENAI_API_KEY\" \\\n -H \"OpenAI-Beta: agents=v1\" \\\n -H \"Content-Type: application/json\" \\\n -d @session.json # model, tools, environment and input, per the quickstart" }, "letme": { "capability": "https://letme.dev/agent.harness", "tool": "https://letme.dev/openai-agents-api" }, "sameCompany": [ "openai-api", "openai-embeddings", "openai-guardrails", "openai-moderation", "openai-image-api", "openai-sora", "openai-speech-to-text", "gpt-live", "openai-realtime", "openai-agents-sdk", "openai-decisions-api", "openai-codex", "gpt-oss-120b", "gpt-oss-20b" ], "area": "frameworks", "provenance": { "legalEntity": "OpenAI OpCo, LLC", "domain": "openai.com", "domainRegistered": "2007-01-19", "domainNote": "openai.com was registered in 2007, before OpenAI existed, per the openai-api listing.", "endpointOnVendorDomain": true, "terms": "https://openai.com/policies/services-agreement/", "privacy": "https://openai.com/policies/privacy-policy/", "statusPage": "https://status.openai.com", "changelog": "https://developers.openai.com/api/docs/changelog", "securityTxt": "valid", "checked": "2026-11-06", "notes": [ "The endpoint is on api.openai.com, the same host as the rest of the OpenAI API. Terms, privacy, security.txt and the domain are the openai-api listing's readings." ], "score": 95 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/openai-agents-api.json", "live": { "slug": "openai-agents-api", "probe": { "target": "https://api.openai.com/v1/agents/sessions", "method": "get", "lastAt": "2026-11-06T09:47:41.371658489Z", "lastOk": true, "lastStatus": 400, "lastMs": 162, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 148, "p95ms24h": 166, "samples24h": 47, "samples30d": 47, "days": [ { "date": "2026-11-06", "probes": 47, "ok": 47 } ] }, "vendorStatus": { "page": "https://status.openai.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-11-06T09:43:26.425829944Z" }, "updatedAt": "2026-11-06T09:47:41.371658489Z" } }, "answer": "OpenAI Agents API scores 73.3 (BB) on agent readiness against Unstoppable's 34.7 (F), and leads in 6 of 7 scored categories.", "b": { "slug": "unstoppable", "name": "Unstoppable", "vendor": "Unstoppable Domains, Inc.", "vendorUrl": "https://unstoppable.ai/", "kind": "harness", "category": "agent-harnesses", "summary": "Unstoppable, from Unstoppable Domains, is a desktop agent IDE for macOS and Windows that runs Claude Code, Codex, Cursor and other coding agents side by side in separate Git worktrees, with Remote Control from iOS, Android and the web.", "url": "https://www.anchorterminal.com/tools/unstoppable", "markdownUrl": "https://www.anchorterminal.com/tools/unstoppable.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/unstoppable.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/unstoppable.json", "dns": "unstoppable.grade.anchorterminal.com", "license": "Proprietary, under Unstoppable Domains, Inc.'s Terms of Service. No source published", "transports": [], "packages": [], "auth": "none", "authNotes": "No credential for an outside agent, because the app exposes no agent interface. A person can use the desktop app as a guest, or sign in through the browser with Google or GitHub, with optional authenticator-app two-factor authentication. Claude, Codex and Cursor connect through their own sign-ins in Settings, Accounts.", "pricing": "freemium", "pricingNotes": "Free to download, and the app is published as free. Agents run on the owner's Claude, ChatGPT or Cursor plan, on Ollama locally, or on AI credits. 10 free AI credits a day once turned on, no card. Credit prices appear only after sign-in. A 14 October post says a plan may not include Remote Control, and an 11 August post lists $19, $29 and $49 plans that no pricing page shows.", "priceSummary": "Freemium", "where": "local", "x402": { "level": "no", "evidence": "No x402, MPP or L402 on the site, the help centre, the terms or llms.txt (checked 2026-10-27). AI credits are bought on the billing page after sign-in; the site's content security policy allows Stripe.", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-10-27" }, "docsUrl": "https://unstoppable.ai/support", "llmsTxt": "https://unstoppable.ai/llms.txt", "capabilities": [ "agent.multi-agent", "agent.harness", "agent.mcp-client", "code.git", "browser.control" ], "tags": [ "not-for-agents", "closed-source", "desktop-app", "macos", "windows", "ios", "android", "local", "hosted", "cloud-agent", "freemium", "byo-plan", "no-card", "approvals", "llms-txt", "new" ], "lastRelease": "2026-10-23", "graded": true, "anchor": { "graded": true, "score": 34.7, "grade": "F", "agentReady": false, "rank": 1249, "ranked": true, "rankOf": 1354, "categoryRank": 47, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 5, "maintenance": 58, "payments": 30, "reliability": 45, "schema": 30, "security": 36, "transparency": 56 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-27" }, "negative": 0, "verdict": "Unstoppable runs several coding agents side by side in separate worktrees on the owner's Claude, ChatGPT or Cursor plans, with dated help articles and a public changelog. It has no API, MCP server or documented command an outside agent can call, every chat starts in Full access, and its pages disagree on which parts need a paid plan.", "bestFor": "A developer who runs Claude Code, Codex and Cursor on existing plans and wants parallel worktrees, pipelines and phone check-ins in one app.", "strengths": [ "Each task runs in its own Git worktree, so parallel agents don't overwrite each other, and the app opens the pull request when asked", "Runs Claude Code, Codex and Cursor on the owner's own plans, Ollama models locally, or hosted models on AI credits, with 10 free credits a day and no card", "Activity sharing to Unstoppable's cloud is Off for every activity type on every plan by default, and secrets are removed before any upload, per the privacy policy", "Approval modes Ask and Accept edits with allow and deny rules by command, file write, MCP tool or network host, where deny wins and safety rules block force-pushes", "A dated changelog for versions 1.12.0 to 1.15.0 (20 to 23 October 2026) and 22 help articles updated between 19 and 24 October 2026" ], "weaknesses": [ "No API, MCP server, SDK or documented CLI for an outside agent. A Linux command-line tool and MCP tools for cloud tasks appear only in changelog lines", "Every kind of chat starts in Full access, which skips approval prompts and the safety rules for risky commands, until the person changes the default", "The home page says every app feature is free when signed in, while a 14 October post says a plan may not include Remote Control and the governance page ties controls to subscriptions", "AI credit prices are shown only after sign-in, and no status page covers the accounts, cloud agents or Remote Control relay", "No security.txt on unstoppable.ai. The parent's security.txt expired on 22 January 2024 and its bug bounty policy link returns 404" ], "agentNotes": [ "Don't plan to drive Unstoppable from another agent. It has no documented API, MCP server or CLI. Call Claude Code, Codex or Cursor directly and let the person use Unstoppable around them", "Inside Unstoppable, check the approval mode before acting. New chats start in Full access unless the person set Ask or Accept edits in Settings, Approvals", "When a Claude or Codex usage limit is reached, ask the person before choosing Use credits now or Always use credits, since both spend their AI credits", "Keep each task in its own worktree and let the person review the diff and press Create PR, rather than pushing to a shared branch" ], "metrics": { "kind": "local", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "F", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 34.7 } ], "editorialScores": { "ergonomics": 5, "maintenance": 58, "payments": 30, "reliability": 45, "schema": 30, "security": 36, "transparency": 40 }, "provenanceScore": 72, "checked": { "categories": { "ergonomics": "2026-10-27", "maintenance": "2026-10-27", "payments": "2026-10-27", "reliability": "2026-10-27", "schema": "2026-10-27", "security": "2026-10-27", "transparency": "2026-10-27" }, "last": "2026-10-27", "lastMoved": "2026-10-30", "oldest": "2026-10-27", "stale": false, "staleAfterDays": 90 } }, "letme": { "capability": "https://letme.dev/agent.multi-agent", "tool": "https://letme.dev/unstoppable" }, "area": "frameworks", "provenance": { "legalEntity": "Unstoppable Domains, Inc.", "domain": "unstoppable.ai", "domainRegistered": "2021-01-05", "endpointOnVendorDomain": null, "terms": "https://unstoppable.ai/terms", "privacy": "https://unstoppable.ai/privacy", "statusPage": "", "changelog": "https://unstoppable.ai/changelog", "securityTxt": "none", "checked": "2026-10-27", "notes": [ "The terms (effective 6 October 2026) name Unstoppable Domains, Inc., choose Delaware law and AAA arbitration, and cover the desktop app, web surface, a command-line interface and an optional agent cloud.", "The privacy policy (effective 8 October 2026) is written for this product and names privacy@unstoppabledomains.com as the contact.", "RDAP gives a registration date of 5 January 2021 for unstoppable.ai, with a registrar transfer on 28 July 2026.", "unstoppable.ai/.well-known/security.txt returned 404 on 27 October 2026. unstoppabledomains.com/.well-known/security.txt expired on 22 January 2024 and its policy link, /bug-bounty, returns 404.", "status.unstoppabledomains.com lists the domains business's web application and APIs, with no component for Unstoppable.ai.", "No endpoint an agent calls, so none is recorded." ], "score": 72 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/unstoppable.json", "live": { "slug": "unstoppable", "securityTxt": { "url": "https://unstoppable.ai/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-05T15:56:07.614551239Z" }, "llmsTxt": { "url": "https://unstoppable.ai/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-05T15:27:32.757856245Z" }, "domain": { "domain": "unstoppable.ai", "registered": "2021-01-05", "source": "https://rdap.identitydigital.services/rdap/domain/unstoppable.ai", "checkedAt": "2026-11-01T14:09:36.833511396Z" }, "pages": [ { "url": "https://unstoppable.ai/changelog", "kind": "changelog", "status": 200, "checkedAt": "2026-11-05T13:07:19.145766611Z", "changedAt": "2026-11-05T13:07:19.145766611Z", "fingerprint": "75920cd30c3f" }, { "url": "https://unstoppable.ai/privacy", "kind": "privacy", "status": 200, "checkedAt": "2026-11-05T13:07:21.56851618Z", "changedAt": "2026-11-05T13:07:21.56851618Z", "fingerprint": "6a38cb7b40b1" }, { "url": "https://unstoppable.ai/terms", "kind": "terms", "status": 200, "checkedAt": "2026-11-05T13:07:23.583518937Z", "changedAt": "2026-11-05T13:07:23.583518937Z", "fingerprint": "fda8dce50002" } ], "updatedAt": "2026-11-05T15:56:07.614551239Z" } }, "edges": [ { "by": 75, "category": "ergonomics", "leads": "openai-agents-api", "name": "Agent ergonomics", "reasons": { "a": "Read as an API an agent drives. Context is compacted automatically, and session budgets and streamed events keep output sized (20 of 25). Sessions can be listed, continued and steered, events streamed or sent by webhook, artifacts fetched (15 of 20). Actionable error codes with recovery steps (20). No idempotency key; a documented check-then-retry procedure (10 of 20). One session call with defaults (medium sandbox, network enabled), SDKs in five languages (15). 20 + 15 + 20 + 10 + 15 = 80.", "b": "These lines measure an interface an agent calls, and Unstoppable has none, so context cost, output controls and retries score nothing. For the person, a usage limit shows choices to wait for the reset or continue on credits (2 of 20). Guest use with no account, a first-run page that imports Claude and Codex projects, and few required settings. No SDK (3 of 15). Total 5." }, "scores": { "a": 80, "b": 5 } }, { "by": 58, "category": "schema", "leads": "openai-agents-api", "name": "Schema \u0026 documentation", "reasons": { "a": "The reference is linked from the overview and the SDKs carry beta.agents types; we didn't confirm /agents/sessions in OpenAI's public OpenAPI file, so 15 of 25. llms.txt with every Agents API page and Markdown twins (10). The overview, architecture page and the agents guide that compares the Agents API, Agents SDK and Responses API say when to use it (20). Typed configuration with enumerated container sizes, network modes and environment types (13 of 15). Examples in six languages and an errors page with codes per HTTP status, turn and session (15). Dated changelog entries and a versioned beta header (15). 15 + 10 + 20 + 13 + 15 + 15 = 88.", "b": "Graded on the interface an outside agent can use, which is none. No API, OpenAPI file, MCP server or documented command (0). unstoppable.ai/llms.txt lists the product, help and policy pages in Markdown (10). Twenty-two dated help articles explain for a person what each part does and when to use it, such as Code and Work modes and approval modes (5 of 20). No typed inputs an agent could call (0). Step-by-step examples for people and named error states such as usage limit reached and update failed, with no error responses for an agent (3 of 15). Numbered versions and a public dated changelog, which lists only four releases from 20 to 23 October 2026 (12 of 15). Total 30." }, "scores": { "a": 88, "b": 30 } }, { "by": 51, "category": "security", "leads": "openai-agents-api", "name": "Security \u0026 auth", "reasons": { "a": "Project keys with restricted per-endpoint permissions, service accounts and workload identity, per the openai-api listing; we didn't confirm a key can be limited to /v1/agents (27 of 30). Automatic review for approvals, a sandbox network restricted to a host allowlist, vaults for secrets and a sandbox security guide (17 of 20). The agent reads web pages, MCP results and browser content; the sandbox security guide and approval flow are the mitigations, with no prompt-injection guide of its own found (8 of 15). Tracing, observability and usage per session and admin audit logs (15). SOC 2 Type 2, ISO 27001 family, Bugcrowd bounty and a disclosure policy, per the openai-api listing (20). Not ZDR-eligible and US residency only, recorded under transparency. 27 + 17 + 8 + 15 + 20 = 87.", "b": "Harness reading of the framework checklist, as for the other harnesses. 30 for what leaves the machine by default, 20 for approvals and sandboxing, 15 for prompt-injection posture, 15 for audit and 20 for the security programme. Activity sharing is Off for every activity type by default and secrets are removed before upload, but the privacy policy also collects usage telemetry (feature use, session activity, token and spend metrics, diagnostics) with no opt-out stated, and updates download automatically by default (15 of 30). Ask and Accept edits modes with allow and deny rules by command, file write, MCP tool and network host, deny winning, and safety rules that block force-pushes and destructive deletes. Every kind of chat starts in Full access, which skips prompts and safety rules, and local agents have no documented sandbox. Cloud worktrees get their own sandbox (8 of 20). The in-app browser stops agents acting on private sign-in pages. No other guidance on untrusted content from web pages, MCP servers or connected tools (3 of 15). Cost and usage panels, a team feed with tool-use metadata, approval rules with their origin, and an Audit Trail experiment in Labs (8 of 15). Two-factor authentication for accounts. No security.txt on unstoppable.ai, the parent's security.txt expired on 22 January 2024, its bug bounty policy link returns 404, and no SOC 2 or ISO 27001 found (2 of 20). Total 36." }, "scores": { "a": 87, "b": 36 } }, { "by": 29, "category": "maintenance", "leads": "openai-agents-api", "name": "Maintenance \u0026 community", "reasons": { "a": "Closed API. Last dated change 16 October 2026, Ultrafast mode and document skills (30). Four dated changelog entries in the 57 days since release, 10 September, 29 September, 9 October and 16 October (20). Changelog and help centre, as the openai-api listing reads them (12 of 15). Official SDKs carry beta.agents (15). SDK CI, per the openai-api listing (10). 30 + 20 + 12 + 15 + 10 = 87.", "b": "Read for a closed product. Version 1.15.0 on 23 October 2026, and iOS 1.1.9 on 27 October (30). Four desktop releases from 20 to 23 October and nine iOS updates since 11 August 2026 (20). A public changelog, a support email, in-app feedback and a Discord server, none tested for replies. Help articles were updated between 19 and 24 October (6 of 15). No SDK and no MCP registry entry (0). Windows updates check signatures per the 1.13.0 notes, with no build pipeline to inspect (2 of 10). Total 58." }, "scores": { "a": 87, "b": 58 } }, { "by": 29, "category": "transparency", "leads": "openai-agents-api", "name": "Transparency \u0026 trust", "reasons": { "a": "Closed service with clear terms, Apache-2.0 SDKs (15). Session state retained until deleted, deletable sessions and artifacts, not ZDR-eligible, US residency only, and the data-controls guide agrees; no retention period for artifacts after a sandbox expires (25 of 30). Dated deprecation notices with minimum periods for GA models; a beta API can change faster (15 of 20). Subprocessors and processing countries listed, per the openai-api listing (20). 15 + 25 + 15 + 20 = 75.", "b": "Closed source under terms of 6 October 2026 that name Unstoppable Domains, Inc. and Delaware law. The terms forbid reverse engineering and building a competing product (15). The privacy policy of 8 October 2026 is written for this product. It states activity sharing levels, Off by default, secret removal and encryption, and configurable transcript retention. It gives no retention periods, names no subprocessors, and says usage telemetry may sync depending on settings, which the site's 'we don't collect your code or conversations' leaves open (16 of 30). No deprecation policy. The terms allow removing parts of the service without notice. The changelog dates one retirement (GPT 5.5 to GPT 6.1 Sol) (3 of 20). No subprocessors or data locations disclosed, and the telemetry the app sends has no documented opt-out (6 of 20). Total 40." }, "scores": { "a": 85, "b": 56 } }, { "by": 15, "category": "reliability", "leads": "openai-agents-api", "name": "Reliability", "reasons": { "a": "Read as a hosted API. status.openai.com has an Agents component under APIs (20). Since release on 10 September (57 days, not 90), the feed names the Agents API in a degraded-performance incident on 14 September, the elevated errors across ChatGPT, Codex and the API on 29 September (the openai-api listing reads that one as a major, 17:52 to 23:14 UTC), computer use issues and degraded workspace agents on 6 and 7 October, degraded performance across the APIs for 22 minutes on 21 October, and overbilling for hosted containers on 19 September. One major, the rest minor (10). Rate limits come from the shared guide, published per tier and model with headers, and the errors page adds a Files API allowance on session creation (15). 429 and 503 guidance with Retry-After, capped backoff and a check-then-retry procedure for turns (15). The Scale Tier SLA in the openai-api listing isn't shown to cover a beta API (0). Public beta behind the agents=v1 header (0). 20 + 10 + 15 + 15 + 0 + 0 = 60.", "b": "Read as local software, because the product is the desktop app the owner runs, as for the other harnesses. Signed downloads for macOS Apple Silicon, macOS Intel and Windows on the download page, version 1.15.0, plus iOS and Android apps in the stores, with the supported platforms stated. No package registry (20). Closed source with no public CI or test suite (0). No public issue tracker. Bugs go through in-app feedback, email and Discord, none of which shows a record we could read (0). Version numbers and a dated changelog, but only 1.12.0 to 1.15.0 are listed and breaking changes are not marked as such (10). Version 1.15.0 (15). The hosted parts (accounts, AI credits, cloud agents, Remote Control) have no status page. status.unstoppabledomains.com covers the domains business only." }, "scores": { "a": 60, "b": 45 } } ], "facts": [ { "a": "HTTP API", "b": "Agent harness", "name": "Kind" }, { "a": "OpenAI", "b": "Unstoppable Domains, Inc.", "name": "Vendor" }, { "a": "https://api.openai.com/v1/agents/sessions", "b": "no (local only)", "name": "Hosted endpoint" }, { "a": "https", "b": "", "name": "Transports" }, { "a": "API key", "b": "None", "name": "Auth" }, { "a": "Pay per use", "b": "Freemium", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Proprietary hosted API under OpenAI's Services Agreement. The SDKs are Apache 2.0", "b": "Proprietary, under Unstoppable Domains, Inc.'s Terms of Service. No source published", "name": "Licence" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "2026-10-16", "b": "2026-10-23", "name": "Last release" }, { "a": "couldn't be read", "b": "2026-10-06", "name": "Terms last updated" }, { "a": "couldn't be read", "b": "2026-10-08", "name": "Privacy policy last updated" }, { "a": "couldn't be read", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "couldn't be read", "b": "not found in the text", "name": "Terms restrict automated access" }, { "a": "couldn't be read", "b": "yes", "name": "Terms restrict benchmarking" }, { "a": "couldn't be read", "b": "not found in the text", "name": "Terms or service can change without notice" }, { "a": "couldn't be read", "b": "yes", "name": "Arbitration or class-action waiver" } ], "faq": [ { "answer": "OpenAI Agents API scores 73.3 (BB) on agent readiness against Unstoppable's 34.7 (F), and leads in 6 of 7 scored categories.", "question": "Which is better for AI agents, OpenAI Agents API or Unstoppable?" }, { "answer": "OpenAI Agents API has a hosted endpoint at https://api.openai.com/v1/agents/sessions. No hosted endpoint is listed for Unstoppable.", "question": "Can an agent call OpenAI Agents API and Unstoppable without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Reliability, 60 against 45", "Schema \u0026 documentation, 88 against 30", "Agent ergonomics, 80 against 5", "Security \u0026 auth, 87 against 36", "Maintenance \u0026 community, 87 against 58", "Transparency \u0026 trust, 85 against 56" ], "also": [ "Agent-ready, a grade of BB or better", "A hosted endpoint, with nothing to install" ], "goodFor": "Teams that want OpenAI to run the agent loop, with sandboxes, MCP tools and subagents, and are fine with a beta API, US-only data residency and no Zero Data Retention.", "slug": "openai-agents-api", "watchFor": "Public beta since 10 September 2026 behind the agents=v1 beta header, with no GA date" }, { "aheadOn": null, "also": [ "No key needed to call it", "Free to start without a card" ], "goodFor": "A developer who runs Claude Code, Codex and Cursor on existing plans and wants parallel worktrees, pipelines and phone check-ins in one app.", "slug": "unstoppable", "watchFor": "No API, MCP server, SDK or documented CLI for an outside agent. A Linux command-line tool and MCP tools for cloud tasks appear only in changelog lines" } ], "history": { "openai-agents-api": null, "unstoppable": [ { "causes": [ "method" ], "date": "2026-10-30", "delta": -0.2, "from": 34.9, "fromGrade": "F", "to": 34.7, "toGrade": "F" } ] }, "job": { "capability": "agent.harness", "name": "Agent harnesses" }, "others": [ { "json": "https://www.anchorterminal.com/compare/agent-zero-vs-openai-agents-api.json", "title": "Agent Zero vs OpenAI Agents API", "url": "https://www.anchorterminal.com/compare/agent-zero-vs-openai-agents-api" }, { "json": "https://www.anchorterminal.com/compare/agent-zero-vs-unstoppable.json", "title": "Agent Zero vs Unstoppable", "url": "https://www.anchorterminal.com/compare/agent-zero-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/aider-vs-openai-agents-api.json", "title": "Aider vs OpenAI Agents API", "url": "https://www.anchorterminal.com/compare/aider-vs-openai-agents-api" }, { "json": 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Unstoppable", "url": "https://www.anchorterminal.com/compare/jules-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/junie-vs-openai-agents-api.json", "title": "Junie CLI vs OpenAI Agents API", "url": "https://www.anchorterminal.com/compare/junie-vs-openai-agents-api" }, { "json": "https://www.anchorterminal.com/compare/junie-vs-unstoppable.json", "title": "Junie CLI vs Unstoppable", "url": "https://www.anchorterminal.com/compare/junie-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/kilo-code-cli-vs-openai-agents-api.json", "title": "Kilo Code CLI vs OpenAI Agents API", "url": "https://www.anchorterminal.com/compare/kilo-code-cli-vs-openai-agents-api" }, { "json": "https://www.anchorterminal.com/compare/kilo-code-cli-vs-unstoppable.json", "title": "Kilo Code CLI vs Unstoppable", "url": "https://www.anchorterminal.com/compare/kilo-code-cli-vs-unstoppable" }, { "json": 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(Warp Agent CLI and the Oz Agent API)", "url": "https://www.anchorterminal.com/compare/openai-agents-api-vs-warp" }, { "json": "https://www.anchorterminal.com/compare/openai-codex-vs-unstoppable.json", "title": "OpenAI Codex vs Unstoppable", "url": "https://www.anchorterminal.com/compare/openai-codex-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/opencode-vs-unstoppable.json", "title": "OpenCode vs Unstoppable", "url": "https://www.anchorterminal.com/compare/opencode-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/openhands-vs-unstoppable.json", "title": "OpenHands vs Unstoppable", "url": "https://www.anchorterminal.com/compare/openhands-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/prime-agent-vs-unstoppable.json", "title": "Prime Agent vs Unstoppable", "url": "https://www.anchorterminal.com/compare/prime-agent-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/qoder-cli-vs-unstoppable.json", "title": "Qoder CLI vs Unstoppable", "url": "https://www.anchorterminal.com/compare/qoder-cli-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/qwen-code-vs-unstoppable.json", "title": "Qwen Code vs Unstoppable", "url": "https://www.anchorterminal.com/compare/qwen-code-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/reflection-mirror-vs-unstoppable.json", "title": "Mirror CLI vs Unstoppable", "url": "https://www.anchorterminal.com/compare/reflection-mirror-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/rovo-dev-cli-vs-unstoppable.json", "title": "Rovo Dev CLI vs Unstoppable", "url": "https://www.anchorterminal.com/compare/rovo-dev-cli-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/clawboo-vs-unstoppable.json", "title": "Clawboo vs Unstoppable", "url": "https://www.anchorterminal.com/compare/clawboo-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/cli-manager-vs-unstoppable.json", "title": "CLI Manager vs Unstoppable", "url": "https://www.anchorterminal.com/compare/cli-manager-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/harness-autonomous-vs-unstoppable.json", "title": "Harness vs Unstoppable", "url": "https://www.anchorterminal.com/compare/harness-autonomous-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/openmausbot-vs-unstoppable.json", "title": "OpenMausBot vs Unstoppable", "url": "https://www.anchorterminal.com/compare/openmausbot-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/paperclip-vs-unstoppable.json", "title": "Paperclip vs Unstoppable", "url": "https://www.anchorterminal.com/compare/paperclip-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/parallax-agents-vs-unstoppable.json", "title": "Parallax vs Unstoppable", "url": "https://www.anchorterminal.com/compare/parallax-agents-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/unstoppable-vs-vibe-trading.json", "title": "Unstoppable vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/unstoppable-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/unstoppable-vs-warp.json", "title": "Unstoppable vs Warp (Warp Agent CLI and the Oz Agent API)", "url": "https://www.anchorterminal.com/compare/unstoppable-vs-warp" } ], "panel": null, "scores": [ { "by": 15, "edge": "openai-agents-api", "key": "reliability", "name": "Reliability", "openai-agents-api": 60, "unstoppable": 45, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 58, "edge": "openai-agents-api", "key": "schema", "name": "Schema \u0026 documentation", "openai-agents-api": 88, "unstoppable": 30, "weight": 13 }, { "by": 75, "edge": "openai-agents-api", "key": "ergonomics", "name": "Agent ergonomics", "openai-agents-api": 80, "unstoppable": 5, "weight": 13 }, { "by": 51, "edge": "openai-agents-api", "key": "security", "name": "Security \u0026 auth", "openai-agents-api": 87, "unstoppable": 36, "weight": 14 }, { "by": 0, "edge": "", "key": "payments", "name": "Payments \u0026 pricing", "openai-agents-api": 30, "unstoppable": 30, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 29, "edge": "openai-agents-api", "key": "maintenance", "name": "Maintenance \u0026 community", "openai-agents-api": 87, "unstoppable": 58, "weight": 7 }, { "by": 29, "edge": "openai-agents-api", "key": "transparency", "name": "Transparency \u0026 trust", "openai-agents-api": 85, "unstoppable": 56, "weight": 7 } ], "summary": "OpenAI Agents API scores 73.3 (BB) on agent readiness against Unstoppable's 34.7 (F), and leads in 6 of 7 scored categories. Both do agent harnesses.", "tasks": null, "tutorials": [], "verdicts": { "openai-agents-api": "OpenAI's hosted agent runtime, the Codex harness behind one session call, with MCP, functions, web search, computer use, subagents and sandboxes on OpenAI or your own infrastructure. Documentation, errors and SDKs are thorough. It's still public beta, can't use Zero Data Retention and keeps data in the United States only.", "unstoppable": "Unstoppable runs several coding agents side by side in separate worktrees on the owner's Claude, ChatGPT or Cursor plans, with dated help articles and a public changelog. It has no API, MCP server or documented command an outside agent can call, every chat starts in Full access, and its pages disagree on which parts need a paid plan." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/openai-agents-api-vs-unstoppable", "json": "https://www.anchorterminal.com/compare/openai-agents-api-vs-unstoppable.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/openai-agents-api-vs-unstoppable.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/openai-agents-api-vs-unstoppable.min.md" }, "markdown": "OpenAI Agents API scores 73.3 (BB) on agent readiness against Unstoppable's 34.7 (F), and leads in 6 of 7 scored categories. Both do agent harnesses.\n\n- OpenAI Agents API: grade BB, 73.3/100, rank #99 of 1354. Markdown https://www.anchorterminal.com/tools/openai-agents-api.md · JSON https://www.anchorterminal.com/api/v1/tools/openai-agents-api.json\n- Unstoppable: grade F, 34.7/100, rank #1249 of 1354. Markdown https://www.anchorterminal.com/tools/unstoppable.md · JSON https://www.anchorterminal.com/api/v1/tools/unstoppable.json\n- Best agent harnesses and coding agents: https://www.anchorterminal.com/best/agent-harnesses/index.md\n- All 1041 harnesses comparisons: https://www.anchorterminal.com/compare/agent-harnesses/index.md\n\n## Which one, for what\n\n### OpenAI Agents API (BB)\n\nGood for: Teams that want OpenAI to run the agent loop, with sandboxes, MCP tools and subagents, and are fine with a beta API, US-only data residency and no Zero Data Retention.\n\nAhead on:\n- Reliability, 60 against 45\n- Schema \u0026 documentation, 88 against 30\n- Agent ergonomics, 80 against 5\n- Security \u0026 auth, 87 against 36\n- Maintenance \u0026 community, 87 against 58\n- Transparency \u0026 trust, 85 against 56\n\nAlso in its favour:\n- Agent-ready, a grade of BB or better\n- A hosted endpoint, with nothing to install\n\nWatch for: Public beta since 10 September 2026 behind the agents=v1 beta header, with no GA date\n\n### Unstoppable (F)\n\nGood for: A developer who runs Claude Code, Codex and Cursor on existing plans and wants parallel worktrees, pipelines and phone check-ins in one app.\n\nAlso in its favour:\n- No key needed to call it\n- Free to start without a card\n\nWatch for: No API, MCP server, SDK or documented CLI for an outside agent. A Linux command-line tool and MCP tools for cloud tasks appear only in changelog lines\n\n\n## Why the edge\n\n### Agent ergonomics: OpenAI Agents API +75\n\n- OpenAI Agents API (80): Read as an API an agent drives. Context is compacted automatically, and session budgets and streamed events keep output sized (20 of 25). Sessions can be listed, continued and steered, events streamed or sent by webhook, artifacts fetched (15 of 20). Actionable error codes with recovery steps (20). No idempotency key; a documented check-then-retry procedure (10 of 20). One session call with defaults (medium sandbox, network enabled), SDKs in five languages (15). 20 + 15 + 20 + 10 + 15 = 80.\n- Unstoppable (5): These lines measure an interface an agent calls, and Unstoppable has none, so context cost, output controls and retries score nothing. For the person, a usage limit shows choices to wait for the reset or continue on credits (2 of 20). Guest use with no account, a first-run page that imports Claude and Codex projects, and few required settings. No SDK (3 of 15). Total 5.\n\n### Schema \u0026 documentation: OpenAI Agents API +58\n\n- OpenAI Agents API (88): The reference is linked from the overview and the SDKs carry beta.agents types; we didn't confirm /agents/sessions in OpenAI's public OpenAPI file, so 15 of 25. llms.txt with every Agents API page and Markdown twins (10). The overview, architecture page and the agents guide that compares the Agents API, Agents SDK and Responses API say when to use it (20). Typed configuration with enumerated container sizes, network modes and environment types (13 of 15). Examples in six languages and an errors page with codes per HTTP status, turn and session (15). Dated changelog entries and a versioned beta header (15). 15 + 10 + 20 + 13 + 15 + 15 = 88.\n- Unstoppable (30): Graded on the interface an outside agent can use, which is none. No API, OpenAPI file, MCP server or documented command (0). unstoppable.ai/llms.txt lists the product, help and policy pages in Markdown (10). Twenty-two dated help articles explain for a person what each part does and when to use it, such as Code and Work modes and approval modes (5 of 20). No typed inputs an agent could call (0). Step-by-step examples for people and named error states such as usage limit reached and update failed, with no error responses for an agent (3 of 15). Numbered versions and a public dated changelog, which lists only four releases from 20 to 23 October 2026 (12 of 15). Total 30.\n\n### Security \u0026 auth: OpenAI Agents API +51\n\n- OpenAI Agents API (87): Project keys with restricted per-endpoint permissions, service accounts and workload identity, per the openai-api listing; we didn't confirm a key can be limited to /v1/agents (27 of 30). Automatic review for approvals, a sandbox network restricted to a host allowlist, vaults for secrets and a sandbox security guide (17 of 20). The agent reads web pages, MCP results and browser content; the sandbox security guide and approval flow are the mitigations, with no prompt-injection guide of its own found (8 of 15). Tracing, observability and usage per session and admin audit logs (15). SOC 2 Type 2, ISO 27001 family, Bugcrowd bounty and a disclosure policy, per the openai-api listing (20). Not ZDR-eligible and US residency only, recorded under transparency. 27 + 17 + 8 + 15 + 20 = 87.\n- Unstoppable (36): Harness reading of the framework checklist, as for the other harnesses. 30 for what leaves the machine by default, 20 for approvals and sandboxing, 15 for prompt-injection posture, 15 for audit and 20 for the security programme. Activity sharing is Off for every activity type by default and secrets are removed before upload, but the privacy policy also collects usage telemetry (feature use, session activity, token and spend metrics, diagnostics) with no opt-out stated, and updates download automatically by default (15 of 30). Ask and Accept edits modes with allow and deny rules by command, file write, MCP tool and network host, deny winning, and safety rules that block force-pushes and destructive deletes. Every kind of chat starts in Full access, which skips prompts and safety rules, and local agents have no documented sandbox. Cloud worktrees get their own sandbox (8 of 20). The in-app browser stops agents acting on private sign-in pages. No other guidance on untrusted content from web pages, MCP servers or connected tools (3 of 15). Cost and usage panels, a team feed with tool-use metadata, approval rules with their origin, and an Audit Trail experiment in Labs (8 of 15). Two-factor authentication for accounts. No security.txt on unstoppable.ai, the parent's security.txt expired on 22 January 2024, its bug bounty policy link returns 404, and no SOC 2 or ISO 27001 found (2 of 20). Total 36.\n\n### Maintenance \u0026 community: OpenAI Agents API +29\n\n- OpenAI Agents API (87): Closed API. Last dated change 16 October 2026, Ultrafast mode and document skills (30). Four dated changelog entries in the 57 days since release, 10 September, 29 September, 9 October and 16 October (20). Changelog and help centre, as the openai-api listing reads them (12 of 15). Official SDKs carry beta.agents (15). SDK CI, per the openai-api listing (10). 30 + 20 + 12 + 15 + 10 = 87.\n- Unstoppable (58): Read for a closed product. Version 1.15.0 on 23 October 2026, and iOS 1.1.9 on 27 October (30). Four desktop releases from 20 to 23 October and nine iOS updates since 11 August 2026 (20). A public changelog, a support email, in-app feedback and a Discord server, none tested for replies. Help articles were updated between 19 and 24 October (6 of 15). No SDK and no MCP registry entry (0). Windows updates check signatures per the 1.13.0 notes, with no build pipeline to inspect (2 of 10). Total 58.\n\n### Transparency \u0026 trust: OpenAI Agents API +29\n\n- OpenAI Agents API (85): Closed service with clear terms, Apache-2.0 SDKs (15). Session state retained until deleted, deletable sessions and artifacts, not ZDR-eligible, US residency only, and the data-controls guide agrees; no retention period for artifacts after a sandbox expires (25 of 30). Dated deprecation notices with minimum periods for GA models; a beta API can change faster (15 of 20). Subprocessors and processing countries listed, per the openai-api listing (20). 15 + 25 + 15 + 20 = 75.\n- Unstoppable (56): Closed source under terms of 6 October 2026 that name Unstoppable Domains, Inc. and Delaware law. The terms forbid reverse engineering and building a competing product (15). The privacy policy of 8 October 2026 is written for this product. It states activity sharing levels, Off by default, secret removal and encryption, and configurable transcript retention. It gives no retention periods, names no subprocessors, and says usage telemetry may sync depending on settings, which the site's 'we don't collect your code or conversations' leaves open (16 of 30). No deprecation policy. The terms allow removing parts of the service without notice. The changelog dates one retirement (GPT 5.5 to GPT 6.1 Sol) (3 of 20). No subprocessors or data locations disclosed, and the telemetry the app sends has no documented opt-out (6 of 20). Total 40.\n\n### Reliability: OpenAI Agents API +15\n\n- OpenAI Agents API (60): Read as a hosted API. status.openai.com has an Agents component under APIs (20). Since release on 10 September (57 days, not 90), the feed names the Agents API in a degraded-performance incident on 14 September, the elevated errors across ChatGPT, Codex and the API on 29 September (the openai-api listing reads that one as a major, 17:52 to 23:14 UTC), computer use issues and degraded workspace agents on 6 and 7 October, degraded performance across the APIs for 22 minutes on 21 October, and overbilling for hosted containers on 19 September. One major, the rest minor (10). Rate limits come from the shared guide, published per tier and model with headers, and the errors page adds a Files API allowance on session creation (15). 429 and 503 guidance with Retry-After, capped backoff and a check-then-retry procedure for turns (15). The Scale Tier SLA in the openai-api listing isn't shown to cover a beta API (0). Public beta behind the agents=v1 header (0). 20 + 10 + 15 + 15 + 0 + 0 = 60.\n- Unstoppable (45): Read as local software, because the product is the desktop app the owner runs, as for the other harnesses. Signed downloads for macOS Apple Silicon, macOS Intel and Windows on the download page, version 1.15.0, plus iOS and Android apps in the stores, with the supported platforms stated. No package registry (20). Closed source with no public CI or test suite (0). No public issue tracker. Bugs go through in-app feedback, email and Discord, none of which shows a record we could read (0). Version numbers and a dated changelog, but only 1.12.0 to 1.15.0 are listed and breaking changes are not marked as such (10). Version 1.15.0 (15). The hosted parts (accounts, AI credits, cloud agents, Remote Control) have no status page. status.unstoppabledomains.com covers the domains business only.\n\n## Score by category\n\n| Category | Weight | OpenAI Agents API | Unstoppable | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 60 | 45 | OpenAI Agents API +15 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 88 | 30 | OpenAI Agents API +58 |\n| Agent ergonomics | 13% (16.2 this run) | 80 | 5 | OpenAI Agents API +75 |\n| Security \u0026 auth | 14% (17.5 this run) | 87 | 36 | OpenAI Agents API +51 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 30 | 30 | even |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 87 | 58 | OpenAI Agents API +29 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 85 | 56 | OpenAI Agents API +29 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **73.3 · BB** | **34.7 · F** | |\n\n## Facts side by side\n\n| Fact | OpenAI Agents API | Unstoppable |\n| --- | --- | --- |\n| Kind | HTTP API | Agent harness |\n| Vendor | OpenAI | Unstoppable Domains, Inc. |\n| Hosted endpoint | `https://api.openai.com/v1/agents/sessions` | no (local only) |\n| Transports | https | |\n| Auth | API key | None |\n| Pricing | Pay per use | Freemium |\n| x402 | no | no |\n| Licence | Proprietary hosted API under OpenAI's Services Agreement. The SDKs are Apache 2.0 | Proprietary, under Unstoppable Domains, Inc.'s Terms of Service. No source published |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-10-16 | 2026-10-23 |\n| Terms last updated | couldn't be read | 2026-10-06 |\n| Privacy policy last updated | couldn't be read | 2026-10-08 |\n| Customer content may train models | couldn't be read | not found in the text |\n| Terms restrict automated access | couldn't be read | not found in the text |\n| Terms restrict benchmarking | couldn't be read | yes |\n| Terms or service can change without notice | couldn't be read | not found in the text |\n| Arbitration or class-action waiver | couldn't be read | yes |\n\n## How the scores have moved\n\n### OpenAI Agents API\n\nNo score change since it was listed.\n\n### Unstoppable\n\n- -0.2 on 30 October 2026: checklist\n\n## Verdicts\n\n**OpenAI Agents API.** OpenAI's hosted agent runtime, the Codex harness behind one session call, with MCP, functions, web search, computer use, subagents and sandboxes on OpenAI or your own infrastructure. Documentation, errors and SDKs are thorough. It's still public beta, can't use Zero Data Retention and keeps data in the United States only.\n\n**Unstoppable.** Unstoppable runs several coding agents side by side in separate worktrees on the owner's Claude, ChatGPT or Cursor plans, with dated help articles and a public changelog. It has no API, MCP server or documented command an outside agent can call, every chat starts in Full access, and its pages disagree on which parts need a paid plan.\n\n## Before you call either\n\n### OpenAI Agents API\n\n1. POST https://api.openai.com/v1/agents/sessions with a project key and the header OpenAI-Beta: agents=v1, or use client.beta.agents in the SDKs\n2. Before retrying, retrieve the session and turn and check which actions completed, since there's no idempotency key\n3. Set the sandbox network to restricted with an allowlist of up to 100 hosts when the agent doesn't need the open web\n4. Save files from /workspace/outputs before deleting a session; no retention period is stated for artifacts\n5. Don't send data that needs Zero Data Retention or non-US residency; the Agents API supports neither\n\n### Unstoppable\n\n1. Don't plan to drive Unstoppable from another agent. It has no documented API, MCP server or CLI. Call Claude Code, Codex or Cursor directly and let the person use Unstoppable around them\n2. Inside Unstoppable, check the approval mode before acting. New chats start in Full access unless the person set Ask or Accept edits in Settings, Approvals\n3. When a Claude or Codex usage limit is reached, ask the person before choosing Use credits now or Always use credits, since both spend their AI credits\n4. Keep each task in its own worktree and let the person review the diff and press Create PR, rather than pushing to a shared branch\n\n## Questions\n\n### Which is better for AI agents, OpenAI Agents API or Unstoppable?\n\nOpenAI Agents API scores 73.3 (BB) on agent readiness against Unstoppable's 34.7 (F), and leads in 6 of 7 scored categories.\n\n### Can an agent call OpenAI Agents API and Unstoppable without installing anything?\n\nOpenAI Agents API has a hosted endpoint at https://api.openai.com/v1/agents/sessions. No hosted endpoint is listed for Unstoppable.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/openai-agents-api-vs-unstoppable.json, and with the fewest tokens: https://www.anchorterminal.com/compare/openai-agents-api-vs-unstoppable.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"openai-agents-api\", \"b\": \"unstoppable\"}`. From a terminal: `anchor compare openai-agents-api unstoppable`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/openai-agents-api.json and https://www.anchorterminal.com/api/v1/tools/unstoppable.json\n\n## Other comparisons with OpenAI Agents API or Unstoppable\n\n- [Agent Zero vs OpenAI Agents API](https://www.anchorterminal.com/compare/agent-zero-vs-openai-agents-api.md)\n- [Agent Zero vs Unstoppable](https://www.anchorterminal.com/compare/agent-zero-vs-unstoppable.md)\n- [Aider vs OpenAI Agents API](https://www.anchorterminal.com/compare/aider-vs-openai-agents-api.md)\n- [Aider vs Unstoppable](https://www.anchorterminal.com/compare/aider-vs-unstoppable.md)\n- [Amp vs OpenAI Agents API](https://www.anchorterminal.com/compare/amp-vs-openai-agents-api.md)\n- [Amp vs Unstoppable](https://www.anchorterminal.com/compare/amp-vs-unstoppable.md)\n- [Antigravity CLI vs OpenAI Agents API](https://www.anchorterminal.com/compare/antigravity-cli-vs-openai-agents-api.md)\n- 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[OpenMausBot vs Unstoppable](https://www.anchorterminal.com/compare/openmausbot-vs-unstoppable.md)\n- [Paperclip vs Unstoppable](https://www.anchorterminal.com/compare/paperclip-vs-unstoppable.md)\n- [Parallax vs Unstoppable](https://www.anchorterminal.com/compare/parallax-agents-vs-unstoppable.md)\n- [Unstoppable vs Vibe-Trading](https://www.anchorterminal.com/compare/unstoppable-vs-vibe-trading.md)\n- [Unstoppable vs Warp (Warp Agent CLI and the Oz Agent API)](https://www.anchorterminal.com/compare/unstoppable-vs-warp.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": "2026-11-06", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.7", "openapi": 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