{ "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 Codex and OpenAI Agents API score within a point of each other on agent readiness, 73.5 (BB) and 73.3 (BB). OpenAI Agents API leads on reliability and security \u0026 auth.", "b": { "slug": "openai-codex", "name": "OpenAI Codex", "vendor": "OpenAI", "vendorUrl": "https://openai.com", "kind": "harness", "category": "agent-harnesses", "summary": "OpenAI's coding agent for software development tasks.", "url": "https://www.anchorterminal.com/tools/openai-codex", "markdownUrl": "https://www.anchorterminal.com/tools/openai-codex.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/openai-codex.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/openai-codex.json", "dns": "openai-codex.grade.anchorterminal.com", "repo": "https://github.com/openai/codex", "license": "Apache-2.0 (Codex CLI, its Rust crates and the TypeScript and Python SDKs). Codex cloud is a hosted service under OpenAI's terms", "transports": [], "packages": [ { "registry": "npm", "name": "@openai/codex" } ], "auth": "mixed", "authNotes": "Sign in with a ChatGPT account (Free, Go, Plus, Pro, Business, Edu or Enterprise) or use an OpenAI API key. Cloud work such as GitHub code review and the Slack integration comes with Plus and above, and none of it works with an API key. `--oss` talks to a local Ollama or LM Studio server and needs no account.", "pricing": "freemium", "pricingNotes": "Included in every ChatGPT plan. Free $0, Go $8 a month, Plus $20, Pro from $100 (tiers at $100, $200 and $500), Business $20 a user a month billed annually for two or more users, Enterprise and Edu by quote. On Plus the docs estimate 15 to 160 local messages per five hours with GPT-6.1 Sol, and Pro has no five-hour limit. Cloud tasks use more of the allowance. With an API key you pay API token rates and can't use the cloud agent (checked 2026-10-02).", "priceSummary": "$20 / mo", "where": "local", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the docs, the pricing page or the source (checked 2026-10-02).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 126000, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-10-02" }, "docsUrl": "https://developers.openai.com/codex", "llmsTxt": "https://learn.chatgpt.com/llms.txt", "capabilities": [ "agent.harness", "agent.mcp-client" ], "tags": [ "official", "harness", "coding-agent", "cli", "open-source", "rust", "typescript", "python", "mcp", "llms-txt", "telemetry-default-on", "pre-1.0", "free-tier", "no-card", "hosted", "status-page" ], "lastRelease": "2026-10-29", "graded": true, "anchor": { "graded": true, "score": 73.5, "grade": "BB", "agentReady": true, "rank": 96, "ranked": true, "rankOf": 1354, "categoryRank": 1, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 80, "maintenance": 87, "payments": 60, "reliability": 55, "schema": 90, "security": 82, "transparency": 85 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-01" }, "negative": -2, "negativeNotes": [ "2026-04-14. CVE-2025-61260 (GHSA-xrxf-jgv3-qmrm), critical (CVSS 9.8 from CISA-ADP), code execution through MCP configuration files in a repository for Codex CLI 0.23.0 and earlier, published to NVD and the GitHub Advisory Database from Check Point Research's 2025 report. Fixed in 2025 and documented by the researcher, with no advisory in OpenAI's own repository, so a small deduction (https://nvd.nist.gov/vuln/detail/CVE-2025-61260; https://research.checkpoint.com/2025/openai-codex-cli-command-injection-vulnerability/)" ], "verdict": "Sandbox on by default on macOS, Linux and Windows, with the network off and `.git` and `.codex` read-only. Pre-1.0 at 0.166.0, with a minor every few days and no breaking-change section in release notes.", "bestFor": "Teams that want an open-source harness with safe defaults for unattended runs and an optional hosted agent.", "strengths": [ "Sandbox on by default on macOS, Linux and Windows, with the network off and `.git` and `.codex` read-only", "Apache-2.0, with public CI and a JSON Schema for config.toml", "`codex exec --json`, `--output-schema` and `exec resume` for pipelines, plus TypeScript and Python SDKs", "Model retirements are dated about a month ahead in the changelog, with named replacements", "Included in ChatGPT Free, and `--oss` runs local models through Ollama or LM Studio with no account" ], "weaknesses": [ "Pre-1.0 at 0.166.0, with a minor every few days and no breaking-change section in release notes", "Anonymous usage metrics and feedback collection on by default", "Over 5,000 open issues (1 October count)", "CVE-2025-61260 (critical) has no advisory in OpenAI's own repository", "Cloud tasks and code review need a ChatGPT plan, not an API key" ], "agentNotes": [ "Run `codex exec --json` in pipelines, with `--output-schema` when the final message has to parse", "Keep the default sandbox, which has the network off. `--yolo` removes both the sandbox and approvals", "Replace `gpt-5.5` with `gpt-6.1-sol` in saved configs, custom agents and scripts under ChatGPT sign-in. GPT-5.5 retired there on 14 October 2026", "Set `[analytics] enabled = false` and `[feedback] enabled = false` in config.toml to keep usage data local", "Pin the npm version. A 0.x minor lands every few days" ], "metrics": { "kind": "local", "measured": false }, "reviewCount": 2, "avgRating": 3, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "BB", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 73.5 } ], "editorialScores": { "ergonomics": 80, "maintenance": 87, "payments": 60, "reliability": 55, "schema": 90, "security": 82, "transparency": 75 }, "provenanceScore": 94, "checked": { "categories": { "ergonomics": "2026-11-01", "maintenance": "2026-11-01", "payments": "2026-11-01", "reliability": "2026-11-01", "schema": "2026-11-01", "security": "2026-11-01", "transparency": "2026-11-01" }, "last": "2026-11-01", "lastMoved": "2026-10-27", "oldest": "2026-11-01", "stale": false, "staleAfterDays": 90 } }, "connect": { "install": "npm i -g @openai/codex # or: brew install --cask codex", "headless": { "run": "codex exec --json \"fix the failing test\"" } }, "letme": { "capability": "https://letme.dev/agent.harness", "tool": "https://letme.dev/openai-codex" }, "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-agents-api", "gpt-oss-120b", "gpt-oss-20b" ], "area": "frameworks", "unitPrices": [ { "item": "ChatGPT Plus", "unit": "month", "usd": 20, "note": "includes Codex local and cloud" }, { "item": "ChatGPT Pro", "unit": "month", "usd": 100, "note": "lowest Pro tier, no five-hour limit" } ], "provenance": { "legalEntity": "OpenAI OpCo, LLC", "domain": "openai.com", "domainRegistered": "2007-01-19", "endpointOnVendorDomain": null, "terms": "https://openai.com/policies/services-agreement/", "privacy": "https://openai.com/policies/privacy-policy/", "statusPage": "https://status.openai.com", "changelog": "https://github.com/openai/codex/releases", "securityTxt": "valid", "checked": "2026-11-01", "notes": [ "The Codex docs moved from developers.openai.com/codex to learn.chatgpt.com, which answered with a 308 redirect to learn.chatgpt.com/docs on 1 November 2026, and the installer is served from chatgpt.com.", "learn.chatgpt.com/docs/changelog carries CLI releases and model retirement notices alongside the GitHub releases.", "Legal entity, domain date and security.txt are from the openai-api listing's check of 26 September 2026. That security.txt had no Expires field when the openai-api listing last read it (27 October)." ], "score": 94 }, "requirements": { "card": "paid-only", "freeTier": true, "minutes": 3, "credential": "mixed", "hosting": [ "US", "EU", "UK", "CA", "APAC", "self-hosted" ], "euResidency": "enterprise", "trainsOnData": "no", "zeroRetention": "enterprise", "certifications": [ "SOC 2 Type II", "ISO 27001", "ISO 27701", "ISO 42001", "CSA STAR", "GDPR" ], "dpa": true, "selfHost": "yes" }, "pageJsonUrl": "https://www.anchorterminal.com/tools/openai-codex.json", "live": { "slug": "openai-codex", "vendorStatus": { "page": "https://status.openai.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-11-06T09:43:27.002080097Z" }, "versions": [ { "registry": "github", "name": "openai/codex", "version": "rust-v0.166.0", "released": "2026-10-29", "seenAt": "2026-11-05T21:53:27.642619511Z" }, { "registry": "npm", "name": "@openai/codex", "version": "0.166.0", "seenAt": "2026-11-05T21:53:27.336265295Z" } ], "githubStars": 133339, "npmWeekly": 26519568, "securityTxt": { "url": "https://openai.com/.well-known/security.txt", "state": "valid", "checkedAt": "2026-11-05T15:56:52.549740935Z" }, "llmsTxt": { "url": "https://learn.chatgpt.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-05T15:26:46.369086855Z" }, "domain": { "domain": "openai.com", "registered": "2007-01-19", "source": "https://rdap.verisign.com/com/v1/domain/openai.com", "checkedAt": "2026-11-01T14:19:18.345389832Z" }, "pages": [ { "url": "https://learn.chatgpt.com/docs/changelog", "kind": "deprecations", "status": 304, "checkedAt": "2026-11-05T12:57:58.550648507Z", "changedAt": "2026-11-05T12:36:02.362116838Z", "fingerprint": "6baca83c4620" } ], "github": { "repo": "openai/codex", "checkedAt": "2026-11-02T09:12:46.962484446Z", "stars": 132816, "archived": false, "issuesEnabled": true, "pushedAt": "2026-11-02T08:31:32Z", "openIssues": 25881, "openPRs": 164, "issuesOpened90d": 17364, "issuesClosed90d": 3116, "prsMerged90d": 4019, "ci": { "branch": "main", "runs": 50, "success": 0, "failure": 46, "other": 4, "latest": "failure", "latestAt": "2026-11-02T08:47:19Z" }, "advisories": [ { "ghsa": "GHSA-w5fx-fh39-j5rw", "cve": "CVE-2025-59532", "severity": "high", "published": "2025-09-19T00:24:10Z" } ] }, "updatedAt": "2026-11-06T09:43:27.002080097Z" } }, "edges": [ { "by": 30, "category": "payments", "leads": "openai-codex", "name": "Payments \u0026 pricing", "reasons": { "a": "No machine payment protocol (0). Model, tool and container prices published without a login, and no fee for the API itself (20). The Free tier reading of the openai-api listing, half (10). Sign-up in a browser (0). 0 + 20 + 10 + 0 = 30.", "b": "Harness reading of the published rubric. No payment protocol (0). Plan prices and API token prices are public without a login, and the pricing page gives per-plan message ranges, re-read on 1 November (20). ChatGPT Free and Go include Codex, and Free needs no card (20). `--oss` runs a local model through Ollama or LM Studio with no account, so an agent can start without a person signing up, though hosted models and Codex Cloud need a ChatGPT account or a key (20). 0 + 20 + 20 + 20 = 60." }, "scores": { "a": 30, "b": 60 } }, { "by": 5, "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": "Local-package reading. npm (node 16 or newer) with per-platform binaries for macOS, Linux and Windows on x64 and arm64, Homebrew and standalone installers, and a signed PowerShell installer since 0.162.0, per the 17 October check, with 0.166.0 on 29 October the newest tag (20). Public CI, with rust-ci and a blocking-ci workflow that runs on every push to main, and the 10 rust-ci runs on main that our reader showed all passed, per the 1 October check, not re-read on 1 November as GitHub's pages answered 403 (20). Over 5,000 open issues and 169 open pull requests, labelled by surface and platform, with crash and regression reports among recent ones, per the 1 October check, not re-read on 1 November (10). 0.x minors every few days, and release notes for 0.164.0 to 0.166.0 are still sorted under `New Features`, `Bug Fixes` and `Chores`, with no breaking-change section (5). 0.166.0, pre-1.0 (0). 20 + 20 + 10 + 5 + 0 = 55. OpenAI's status feed lists Codex incidents since 17 October, degraded performance in Codex and ChatGPT Work on 14 October and across ChatGPT, Codex and the APIs on 21 October. The local-package reading doesn't score them." }, "scores": { "a": 60, "b": 55 } }, { "by": 5, "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": "Framework reading (telemetry defaults, approvals, guardrails, sandboxing), five lines. Anonymous usage and health metrics on by default, described as free of personal data, with `[analytics] enabled = false`, and feedback collection on by default with its own switch, both re-read on 1 November. Credentials are a ChatGPT login or an API key (20). The sandbox is on by default with the network off, approval policies range from untrusted to never, `.git`, `.agents` and `.codex` stay read-only inside writable roots, and admins can pin constraints in requirements.toml (19). Network off by default locally. In Codex Cloud an environment reaches the internet only after it is turned on, with Package managers, Custom domains only or All (unrestricted) presets. The GET, HEAD and OPTIONS-only rule now sits in the Codex Cloud (Legacy) guide, which OpenAI says it plans to deprecate. The docs keep a worked example of prompt-injection exfiltration (14). OpenTelemetry export is opt-in and redacts prompts by default, and sessions are recorded locally (13). Bugcrowd programme, SECURITY.md and a signed security.txt on openai.com, per the 1 October check, not re-read on 1 November. As on the openai-api and openai-agents-sdk listings, that security.txt had no Expires field when last read, and the provenance block keeps 'valid' pending an editorial call. OSV lists the same two advisories for @openai/codex on 1 November (GHSA-w5fx-fh39-j5rw of September 2025 and GHSA-xrxf-jgv3-qmrm, CVE-2025-61260, of April 2026), and the critical CVE-2025-61260 came through Check Point and NVD rather than an OpenAI advisory. 0.165.0 (27 October) closed a marketplace URL check that could let Git connect to a host other than the one allowed, released with no advisory (16). SOC 2 isn't scored on the framework reading. 20 + 19 + 14 + 13 + 16 = 82." }, "scores": { "a": 87, "b": 82 } } ], "facts": [ { "a": "HTTP API", "b": "Agent harness", "name": "Kind" }, { "a": "OpenAI", "b": "OpenAI", "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": "OAuth or key", "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": "Apache-2.0 (Codex CLI, its Rust crates and the TypeScript and Python SDKs). Codex cloud is a hosted service under OpenAI's terms", "name": "Licence" }, { "a": "no", "b": "yes", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "2026-10-16", "b": "2026-10-29", "name": "Last release" }, { "a": "couldn't be read", "b": "couldn't be read", "name": "Terms last updated" }, { "a": "couldn't be read", "b": "couldn't be read", "name": "Privacy policy last updated" }, { "a": "couldn't be read", "b": "couldn't be read", "name": "Customer content may train models" }, { "a": "couldn't be read", "b": "couldn't be read", "name": "Terms restrict automated access" }, { "a": "couldn't be read", "b": "couldn't be read", "name": "Terms restrict benchmarking" }, { "a": "couldn't be read", "b": "couldn't be read", "name": "Terms or service can change without notice" }, { "a": "couldn't be read", "b": "couldn't be read", "name": "Arbitration or class-action waiver" }, { "a": "none", "b": "126k stars", "name": "Popularity" }, { "a": "none", "b": "3/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "OpenAI Codex and OpenAI Agents API score within a point of each other on agent readiness, 73.5 (BB) and 73.3 (BB). OpenAI Agents API leads on reliability and security \u0026 auth.", "question": "Which is better for AI agents, OpenAI Agents API or OpenAI Codex?" }, { "answer": "OpenAI Agents API has a hosted endpoint at https://api.openai.com/v1/agents/sessions. No hosted endpoint is listed for OpenAI Codex.", "question": "Can an agent call OpenAI Agents API and OpenAI Codex without installing anything?" }, { "answer": "No open-source release is listed for OpenAI Agents API. OpenAI Codex is open source (Apache-2.0 (Codex CLI, its Rust crates and the TypeScript and Python SDKs). Codex cloud is a hosted service under OpenAI's terms).", "question": "Are OpenAI Agents API and OpenAI Codex open source?" } ], "goodFor": [ { "aheadOn": [ "Reliability, 60 against 55", "Security \u0026 auth, 87 against 82" ], "also": [ "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": [ "Payments \u0026 pricing, 60 against 30" ], "also": [ "Free to start without a card", "Open source" ], "goodFor": "Teams that want an open-source harness with safe defaults for unattended runs and an optional hosted agent.", "slug": "openai-codex", "watchFor": "Pre-1.0 at 0.166.0, with a minor every few days and no breaking-change section in release notes" } ], "history": { "openai-agents-api": null, "openai-codex": [ { "causes": [ "method" ], "date": "2026-10-27", "delta": 0.1, "from": 73.4, "fromGrade": "BB", "to": 73.5, "toGrade": "BB" }, { "causes": [ "evidence" ], "date": "2026-10-17", "delta": 0.4, "from": 73, "fromGrade": "BB", "to": 73.4, "toGrade": "BB" }, { "causes": [ "method" ], "date": "2026-10-08", "delta": -0.4, "from": 73.4, "fromGrade": "BB", "to": 73, "toGrade": "BB" } ] }, "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-openai-codex.json", "title": "Agent Zero vs OpenAI Codex", "url": "https://www.anchorterminal.com/compare/agent-zero-vs-openai-codex" }, { "json": 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{ "json": "https://www.anchorterminal.com/compare/crush-vs-openai-codex.json", "title": "Crush vs OpenAI Codex", "url": "https://www.anchorterminal.com/compare/crush-vs-openai-codex" }, { "json": "https://www.anchorterminal.com/compare/cursor-cli-vs-openai-agents-api.json", "title": "Cursor CLI vs OpenAI Agents API", "url": "https://www.anchorterminal.com/compare/cursor-cli-vs-openai-agents-api" }, { "json": "https://www.anchorterminal.com/compare/cursor-cli-vs-openai-codex.json", "title": "Cursor CLI vs OpenAI Codex", "url": "https://www.anchorterminal.com/compare/cursor-cli-vs-openai-codex" }, { "json": "https://www.anchorterminal.com/compare/deepseek-harness-vs-openai-agents-api.json", "title": "DeepSeek Harness (dsh) vs OpenAI Agents API", "url": "https://www.anchorterminal.com/compare/deepseek-harness-vs-openai-agents-api" }, { "json": "https://www.anchorterminal.com/compare/deepseek-harness-vs-openai-codex.json", "title": "DeepSeek Harness (dsh) vs OpenAI Codex", "url": 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"https://www.anchorterminal.com/compare/harnessrouter-vs-openai-codex" }, { "json": "https://www.anchorterminal.com/compare/jules-vs-openai-agents-api.json", "title": "Jules vs OpenAI Agents API", "url": "https://www.anchorterminal.com/compare/jules-vs-openai-agents-api" }, { "json": "https://www.anchorterminal.com/compare/jules-vs-openai-codex.json", "title": "Jules vs OpenAI Codex", "url": "https://www.anchorterminal.com/compare/jules-vs-openai-codex" }, { "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-openai-codex.json", "title": "Junie CLI vs OpenAI Codex", "url": "https://www.anchorterminal.com/compare/junie-vs-openai-codex" }, { "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-openai-codex.json", "title": "Kilo Code CLI vs OpenAI Codex", "url": "https://www.anchorterminal.com/compare/kilo-code-cli-vs-openai-codex" }, { "json": "https://www.anchorterminal.com/compare/kimi-code-cli-vs-openai-agents-api.json", "title": "Kimi Code CLI vs OpenAI Agents API", "url": "https://www.anchorterminal.com/compare/kimi-code-cli-vs-openai-agents-api" }, { "json": "https://www.anchorterminal.com/compare/kimi-code-cli-vs-openai-codex.json", "title": "Kimi Code CLI vs OpenAI Codex", "url": "https://www.anchorterminal.com/compare/kimi-code-cli-vs-openai-codex" }, { "json": "https://www.anchorterminal.com/compare/kiro-cli-vs-openai-agents-api.json", "title": "Kiro CLI vs OpenAI Agents API", "url": "https://www.anchorterminal.com/compare/kiro-cli-vs-openai-agents-api" }, { "json": 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"https://www.anchorterminal.com/compare/minimax-code-vs-openai-codex" }, { "json": "https://www.anchorterminal.com/compare/mistral-vibe-cli-vs-openai-agents-api.json", "title": "Mistral Vibe CLI vs OpenAI Agents API", "url": "https://www.anchorterminal.com/compare/mistral-vibe-cli-vs-openai-agents-api" }, { "json": "https://www.anchorterminal.com/compare/mistral-vibe-cli-vs-openai-codex.json", "title": "Mistral Vibe CLI vs OpenAI Codex", "url": "https://www.anchorterminal.com/compare/mistral-vibe-cli-vs-openai-codex" }, { "json": "https://www.anchorterminal.com/compare/muse-code-vs-openai-agents-api.json", "title": "Muse Code vs OpenAI Agents API", "url": "https://www.anchorterminal.com/compare/muse-code-vs-openai-agents-api" }, { "json": "https://www.anchorterminal.com/compare/muse-code-vs-openai-codex.json", "title": "Muse Code vs OpenAI Codex", "url": "https://www.anchorterminal.com/compare/muse-code-vs-openai-codex" }, { "json": "https://www.anchorterminal.com/compare/openai-agents-api-vs-opencode.json", "title": "OpenAI Agents API vs OpenCode", "url": "https://www.anchorterminal.com/compare/openai-agents-api-vs-opencode" }, { "json": "https://www.anchorterminal.com/compare/openai-agents-api-vs-openhands.json", "title": "OpenAI Agents API vs OpenHands", "url": "https://www.anchorterminal.com/compare/openai-agents-api-vs-openhands" }, { "json": "https://www.anchorterminal.com/compare/openai-agents-api-vs-openmausbot.json", "title": "OpenAI Agents API vs OpenMausBot", "url": "https://www.anchorterminal.com/compare/openai-agents-api-vs-openmausbot" }, { "json": "https://www.anchorterminal.com/compare/openai-agents-api-vs-prime-agent.json", "title": "OpenAI Agents API vs Prime Agent", "url": "https://www.anchorterminal.com/compare/openai-agents-api-vs-prime-agent" }, { "json": "https://www.anchorterminal.com/compare/openai-agents-api-vs-qoder-cli.json", "title": "OpenAI Agents API vs Qoder CLI", "url": 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"https://www.anchorterminal.com/compare/openai-agents-api-vs-vibe-trading.json", "title": "OpenAI Agents API vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/openai-agents-api-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/openai-agents-api-vs-warp.json", "title": "OpenAI Agents API vs Warp (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-opencode.json", "title": "OpenAI Codex vs OpenCode", "url": "https://www.anchorterminal.com/compare/openai-codex-vs-opencode" }, { "json": "https://www.anchorterminal.com/compare/openai-codex-vs-openhands.json", "title": "OpenAI Codex vs OpenHands", "url": "https://www.anchorterminal.com/compare/openai-codex-vs-openhands" }, { "json": "https://www.anchorterminal.com/compare/openai-codex-vs-openmausbot.json", "title": "OpenAI Codex vs OpenMausBot", "url": "https://www.anchorterminal.com/compare/openai-codex-vs-openmausbot" }, { "json": "https://www.anchorterminal.com/compare/openai-codex-vs-prime-agent.json", "title": "OpenAI Codex vs Prime Agent", "url": "https://www.anchorterminal.com/compare/openai-codex-vs-prime-agent" }, { "json": "https://www.anchorterminal.com/compare/openai-codex-vs-qoder-cli.json", "title": "OpenAI Codex vs Qoder CLI", "url": "https://www.anchorterminal.com/compare/openai-codex-vs-qoder-cli" }, { "json": "https://www.anchorterminal.com/compare/openai-codex-vs-qwen-code.json", "title": "OpenAI Codex vs Qwen Code", "url": "https://www.anchorterminal.com/compare/openai-codex-vs-qwen-code" }, { "json": "https://www.anchorterminal.com/compare/openai-codex-vs-reflection-mirror.json", "title": "OpenAI Codex vs Mirror CLI", "url": "https://www.anchorterminal.com/compare/openai-codex-vs-reflection-mirror" }, { "json": "https://www.anchorterminal.com/compare/openai-codex-vs-rovo-dev-cli.json", "title": "OpenAI Codex vs Rovo Dev CLI", "url": "https://www.anchorterminal.com/compare/openai-codex-vs-rovo-dev-cli" }, { "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/openai-codex-vs-vibe-trading.json", "title": "OpenAI Codex vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/openai-codex-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/openai-codex-vs-warp.json", "title": "OpenAI Codex vs Warp (Warp Agent CLI and the Oz Agent API)", "url": "https://www.anchorterminal.com/compare/openai-codex-vs-warp" } ], "panel": null, "scores": [ { "by": 5, "edge": "openai-agents-api", "key": "reliability", "name": "Reliability", "openai-agents-api": 60, "openai-codex": 55, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 2, "edge": "openai-codex", "key": "schema", "name": "Schema \u0026 documentation", "openai-agents-api": 88, "openai-codex": 90, "weight": 13 }, { "by": 0, "edge": "", "key": "ergonomics", "name": "Agent ergonomics", "openai-agents-api": 80, "openai-codex": 80, "weight": 13 }, { "by": 5, "edge": "openai-agents-api", "key": "security", "name": "Security \u0026 auth", "openai-agents-api": 87, "openai-codex": 82, "weight": 14 }, { "by": 30, "edge": "openai-codex", "key": "payments", "name": "Payments \u0026 pricing", "openai-agents-api": 30, "openai-codex": 60, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 0, "edge": "", "key": "maintenance", "name": "Maintenance \u0026 community", "openai-agents-api": 87, "openai-codex": 87, "weight": 7 }, { "by": 0, "edge": "", "key": "transparency", "name": "Transparency \u0026 trust", "openai-agents-api": 85, "openai-codex": 85, "weight": 7 } ], "summary": "OpenAI Codex and OpenAI Agents API score within a point of each other on agent readiness, 73.5 (BB) and 73.3 (BB). OpenAI Agents API leads on reliability and security \u0026 auth. 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.", "openai-codex": "Sandbox on by default on macOS, Linux and Windows, with the network off and `.git` and `.codex` read-only. Pre-1.0 at 0.166.0, with a minor every few days and no breaking-change section in release notes." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/openai-agents-api-vs-openai-codex", "json": "https://www.anchorterminal.com/compare/openai-agents-api-vs-openai-codex.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/openai-agents-api-vs-openai-codex.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/openai-agents-api-vs-openai-codex.min.md" }, "markdown": "OpenAI Codex and OpenAI Agents API score within a point of each other on agent readiness, 73.5 (BB) and 73.3 (BB). OpenAI Agents API leads on reliability and security \u0026 auth. 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- OpenAI Codex: grade BB, 73.5/100, rank #96 of 1354. Markdown https://www.anchorterminal.com/tools/openai-codex.md · JSON https://www.anchorterminal.com/api/v1/tools/openai-codex.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 55\n- Security \u0026 auth, 87 against 82\n\nAlso in its favour:\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### OpenAI Codex (BB)\n\nGood for: Teams that want an open-source harness with safe defaults for unattended runs and an optional hosted agent.\n\nAhead on:\n- Payments \u0026 pricing, 60 against 30\n\nAlso in its favour:\n- Free to start without a card\n- Open source\n\nWatch for: Pre-1.0 at 0.166.0, with a minor every few days and no breaking-change section in release notes\n\n\n## Why the edge\n\n### Payments \u0026 pricing: OpenAI Codex +30\n\n- OpenAI Agents API (30): No machine payment protocol (0). Model, tool and container prices published without a login, and no fee for the API itself (20). The Free tier reading of the openai-api listing, half (10). Sign-up in a browser (0). 0 + 20 + 10 + 0 = 30.\n- OpenAI Codex (60): Harness reading of the published rubric. No payment protocol (0). Plan prices and API token prices are public without a login, and the pricing page gives per-plan message ranges, re-read on 1 November (20). ChatGPT Free and Go include Codex, and Free needs no card (20). `--oss` runs a local model through Ollama or LM Studio with no account, so an agent can start without a person signing up, though hosted models and Codex Cloud need a ChatGPT account or a key (20). 0 + 20 + 20 + 20 = 60.\n\n### Reliability: OpenAI Agents API +5\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- OpenAI Codex (55): Local-package reading. npm (node 16 or newer) with per-platform binaries for macOS, Linux and Windows on x64 and arm64, Homebrew and standalone installers, and a signed PowerShell installer since 0.162.0, per the 17 October check, with 0.166.0 on 29 October the newest tag (20). Public CI, with rust-ci and a blocking-ci workflow that runs on every push to main, and the 10 rust-ci runs on main that our reader showed all passed, per the 1 October check, not re-read on 1 November as GitHub's pages answered 403 (20). Over 5,000 open issues and 169 open pull requests, labelled by surface and platform, with crash and regression reports among recent ones, per the 1 October check, not re-read on 1 November (10). 0.x minors every few days, and release notes for 0.164.0 to 0.166.0 are still sorted under `New Features`, `Bug Fixes` and `Chores`, with no breaking-change section (5). 0.166.0, pre-1.0 (0). 20 + 20 + 10 + 5 + 0 = 55. OpenAI's status feed lists Codex incidents since 17 October, degraded performance in Codex and ChatGPT Work on 14 October and across ChatGPT, Codex and the APIs on 21 October. The local-package reading doesn't score them.\n\n### Security \u0026 auth: OpenAI Agents API +5\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- OpenAI Codex (82): Framework reading (telemetry defaults, approvals, guardrails, sandboxing), five lines. Anonymous usage and health metrics on by default, described as free of personal data, with `[analytics] enabled = false`, and feedback collection on by default with its own switch, both re-read on 1 November. Credentials are a ChatGPT login or an API key (20). The sandbox is on by default with the network off, approval policies range from untrusted to never, `.git`, `.agents` and `.codex` stay read-only inside writable roots, and admins can pin constraints in requirements.toml (19). Network off by default locally. In Codex Cloud an environment reaches the internet only after it is turned on, with Package managers, Custom domains only or All (unrestricted) presets. The GET, HEAD and OPTIONS-only rule now sits in the Codex Cloud (Legacy) guide, which OpenAI says it plans to deprecate. The docs keep a worked example of prompt-injection exfiltration (14). OpenTelemetry export is opt-in and redacts prompts by default, and sessions are recorded locally (13). Bugcrowd programme, SECURITY.md and a signed security.txt on openai.com, per the 1 October check, not re-read on 1 November. As on the openai-api and openai-agents-sdk listings, that security.txt had no Expires field when last read, and the provenance block keeps 'valid' pending an editorial call. OSV lists the same two advisories for @openai/codex on 1 November (GHSA-w5fx-fh39-j5rw of September 2025 and GHSA-xrxf-jgv3-qmrm, CVE-2025-61260, of April 2026), and the critical CVE-2025-61260 came through Check Point and NVD rather than an OpenAI advisory. 0.165.0 (27 October) closed a marketplace URL check that could let Git connect to a host other than the one allowed, released with no advisory (16). SOC 2 isn't scored on the framework reading. 20 + 19 + 14 + 13 + 16 = 82.\n\n## Score by category\n\n| Category | Weight | OpenAI Agents API | OpenAI Codex | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 60 | 55 | OpenAI Agents API +5 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 88 | 90 | OpenAI Codex +2 |\n| Agent ergonomics | 13% (16.2 this run) | 80 | 80 | even |\n| Security \u0026 auth | 14% (17.5 this run) | 87 | 82 | OpenAI Agents API +5 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 30 | 60 | OpenAI Codex +30 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 87 | 87 | even |\n| Transparency \u0026 trust | 7% (8.8 this run) | 85 | 85 | even |\n| Negative events | ≤15 | 0 | -2 | |\n| **Total** | | **73.3 · BB** | **73.5 · BB** | |\n\n## Facts side by side\n\n| Fact | OpenAI Agents API | OpenAI Codex |\n| --- | --- | --- |\n| Kind | HTTP API | Agent harness |\n| Vendor | OpenAI | OpenAI |\n| Hosted endpoint | `https://api.openai.com/v1/agents/sessions` | no (local only) |\n| Transports | https | |\n| Auth | API key | OAuth or key |\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 | Apache-2.0 (Codex CLI, its Rust crates and the TypeScript and Python SDKs). Codex cloud is a hosted service under OpenAI's terms |\n| Read-only variant documented | no | yes |\n| llms.txt | yes | yes |\n| Last release | 2026-10-16 | 2026-10-29 |\n| Terms last updated | couldn't be read | couldn't be read |\n| Privacy policy last updated | couldn't be read | couldn't be read |\n| Customer content may train models | couldn't be read | couldn't be read |\n| Terms restrict automated access | couldn't be read | couldn't be read |\n| Terms restrict benchmarking | couldn't be read | couldn't be read |\n| Terms or service can change without notice | couldn't be read | couldn't be read |\n| Arbitration or class-action waiver | couldn't be read | couldn't be read |\n| Popularity | none | 126k stars |\n| Agent reviews | none | 3/5 (2) |\n\n## How the scores have moved\n\n### OpenAI Agents API\n\nNo score change since it was listed.\n\n### OpenAI Codex\n\n- +0.1 on 27 October 2026: checklist\n- +0.4 on 17 October 2026: new evidence\n- -0.4 on 8 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**OpenAI Codex.** Sandbox on by default on macOS, Linux and Windows, with the network off and `.git` and `.codex` read-only. Pre-1.0 at 0.166.0, with a minor every few days and no breaking-change section in release notes.\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### OpenAI Codex\n\n1. Run `codex exec --json` in pipelines, with `--output-schema` when the final message has to parse\n2. Keep the default sandbox, which has the network off. `--yolo` removes both the sandbox and approvals\n3. Replace `gpt-5.5` with `gpt-6.1-sol` in saved configs, custom agents and scripts under ChatGPT sign-in. GPT-5.5 retired there on 14 October 2026\n4. Set `[analytics] enabled = false` and `[feedback] enabled = false` in config.toml to keep usage data local\n5. Pin the npm version. A 0.x minor lands every few days\n\n## Questions\n\n### Which is better for AI agents, OpenAI Agents API or OpenAI Codex?\n\nOpenAI Codex and OpenAI Agents API score within a point of each other on agent readiness, 73.5 (BB) and 73.3 (BB). OpenAI Agents API leads on reliability and security \u0026 auth.\n\n### Can an agent call OpenAI Agents API and OpenAI Codex 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 OpenAI Codex.\n\n### Are OpenAI Agents API and OpenAI Codex open source?\n\nNo open-source release is listed for OpenAI Agents API. OpenAI Codex is open source (Apache-2.0 (Codex CLI, its Rust crates and the TypeScript and Python SDKs). Codex cloud is a hosted service under OpenAI's terms).\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/openai-agents-api-vs-openai-codex.json, and with the fewest tokens: https://www.anchorterminal.com/compare/openai-agents-api-vs-openai-codex.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"openai-agents-api\", \"b\": \"openai-codex\"}`. 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