{"slug":"openai-codex","name":"OpenAI Codex","domain":"openai.com","verdict":"As of 2026-07-15, ChatGPT, Claude, Gemini, Grok collectively rank OpenAI Codex #3 of 10 for background coding agent (one of 2 leaderboards it appears on). Source: https://modelsagree.com/product/openai-codex (modelsagree.com, CC BY 4.0).","best_rank":3,"categories":2,"brief":{"category":"best-background-coding-agent","title":"Best background coding agent","rank":3,"of":10,"top":"GitHub Copilot Coding Agent","day":"2026-07-17","why":[{"t":"Polished ticket-to-PR pipeline","m":["ChatGPT","Claude"],"q":"The most polished ticket-to-PR pipeline as of 2026"},{"t":"Long-running parallel cloud sandboxes","m":["ChatGPT","Claude"],"q":"capable long-running cloud sandboxes, parallel delegation"},{"t":"Direct issue assignment and PRs","m":["ChatGPT","Claude"],"q":"GitHub integration for assigning work and auto-opening PRs"},{"t":"Strong review-driven iteration","m":["ChatGPT","Claude"],"q":"test execution, and review-driven iteration"}],"gap":[{"t":"Plan-first steerability before execution","m":["Gemini"],"q":"inspect, modify, and validate the agent's plan before execution"},{"t":"Firewalled runner and org controls","m":["Claude"],"q":"it works in a firewalled Actions runner, opens a draft PR, responds to review comments, and inherits org policy/audit controls"},{"t":"Issue and Jira assignment","m":["ChatGPT"],"q":"issue and Jira assignment"}],"fix":[{"t":"Complex private environments need configuration","m":["ChatGPT","Claude"],"q":"Private dependencies and service-heavy environments require substantial sandbox configuration"},{"t":"Clunky non-GitHub ticket integrations","m":["Claude"],"q":"Jira/Linear flows are clunkier than Devin's"},{"t":"Cloud-task costs can vary","m":["ChatGPT"],"q":"token-based cloud-task costs can vary"}]},"entries":[{"slug":"best-background-coding-agent","title":"Best background coding agent","rank":3,"of":10,"score":10,"appearances":2,"modelRanks":{"ChatGPT":1,"Claude":1},"reason":"Best overall for a typical GitHub team: consistently strong real-world PR acceptance, capable long-running cloud sandboxes, parallel delegation, direct issue assignment, test execution, and review-driven iteration. Assumes tickets are well scoped and repositories have reproducible setup.","reasons":[{"model":"ChatGPT","reason":"Best overall for a typical GitHub team: consistently strong real-world PR acceptance, capable long-running cloud sandboxes, parallel delegation, direct issue assignment, test execution, and review-driven iteration. Assumes tickets are well scoped and repositories have reproducible setup."},{"model":"Claude","reason":"The most polished ticket-to-PR pipeline as of 2026 — cloud sandboxes that run many tasks in parallel, GitHub integration for assigning work and auto-opening PRs, strong code-review mode, and GPT-5-Codex-class models tuned specifically for long autonomous runs; bundled into ChatGPT Plus/Pro/Team plans, so the typical practitioner gets it at effectively marginal cost. Rank assumes the practitioner wants a hosted, low-setup agent rather than self-hosted control."}],"fixes":[{"model":"ChatGPT","fix":"Private dependencies and service-heavy environments require substantial sandbox configuration, while token-based cloud-task costs can vary."},{"model":"Claude","fix":"Weakest at deep integration with non-GitHub ticket systems (Jira/Linear flows are clunkier than Devin's), and its sandboxed environment setup for complex monorepos with private dependencies still takes real configuration effort."}],"updated":"2026-07-15","rank_history":{"days":["2026-07-13","2026-07-15"],"ranks":[1,null]},"api":"https://modelsagree.com/api/v1/best/best-background-coding-agent.json"},{"slug":"best-ai-coding-assistant","title":"Best AI coding assistant","rank":4,"of":7,"score":7,"appearances":3,"modelRanks":{"ChatGPT":3,"Claude":4,"Grok":4},"reason":"Excellent autonomous implementation and review, strong long-horizon reasoning, parallel-agent workflows, and convenient local, cloud, desktop, and GitHub surfaces; especially valuable when already paying for ChatGPT","reasons":[{"model":"ChatGPT","reason":"Excellent autonomous implementation and review, strong long-horizon reasoning, parallel-agent workflows, and convenient local, cloud, desktop, and GitHub surfaces; especially valuable when already paying for ChatGPT"},{"model":"Claude","reason":"GPT-5-codex-class models are genuinely competitive at hard, long-horizon tasks, and the cloud-parallel agent model (fan out several tasks, review diffs async) is a distinct, productive workflow bundled cheaply into ChatGPT plans. Near-tie with Copilot on overall practitioner value."},{"model":"Grok","reason":"Powerful multi-agent platform with strong model backbone, excellent for app development and cloud/desktop workflows, high value in subscriptions for heavy engineering"}],"fixes":[{"model":"ChatGPT","fix":"Less cohesive as an always-on editor experience than Cursor, with substantial work often happening outside the developer’s normal IDE flow"},{"model":"Claude","fix":"Single-vendor by design — OpenAI models only, with a thinner extensibility/ecosystem story (hooks, integrations) than Claude Code or Cursor."},{"model":"Grok","fix":"Speed up response times and reduce occasional over-proactiveness that ignores fine instructions"}],"updated":"2026-07-15","rank_history":{"days":["2026-06-29","2026-06-30","2026-07-08","2026-07-09","2026-07-10","2026-07-12","2026-07-13","2026-07-14","2026-07-15"],"ranks":[5,4,4,4,3,5,4,3,4]},"reasoning_shift":[{"model":"ChatGPT","from":"2026-07-14","to":"2026-07-15","added":[{"t":"ChatGPT subscription value","q":"especially valuable when already paying for ChatGPT"},{"t":"Less cohesive editor experience","q":"Less cohesive as an always-on editor experience than Cursor"},{"t":"Work outside normal IDE","q":"substantial work often happening outside the developer’s normal IDE flow"}],"dropped":[{"t":"Near-tied with Claude Code","q":"near-tied with Claude Code"},{"t":"Heavy usage can become expensive","q":"Heavy usage can become expensive"},{"t":"Review destructive commands and architecture","q":"careful review around destructive commands and subtle architectural choices"}]},{"model":"Claude","from":"2026-07-13","to":"2026-07-14","added":[{"t":"near-tie with Copilot","q":"Near-tie with Copilot on overall practitioner value."}],"dropped":[{"t":"capable CLI and IDE extension","q":"plus a capable CLI/IDE extension backed by codex-tuned GPT-5-class models"}]}],"api":"https://modelsagree.com/api/v1/best/best-ai-coding-assistant.json"}],"page":"https://modelsagree.com/product/openai-codex","check":"https://modelsagree.com/check?q=OpenAI%20Codex","updated":"2026-08-10T18:18:45.051Z","attribution":"modelsagree.com, CC BY 4.0"}