AI Services

Codex

OpenAI

OpenAI's coding agent. It can run tasks in parallel in the cloud and is available from ChatGPT, a CLI, and IDEs.

Pricing

  • ChatGPT に込みFrom Plus $20/mo

    Included with ChatGPT Plus, Pro, and Business subscriptions.

  • API 従量課金Per-token

    Also available via API key.

For reference as of January 2026. Prices and plans change often — always check the official site for the latest.

Key features

  • Parallel cloud tasks

    Run many sandboxed tasks at once, each ending in a pull request.

  • CLI & IDE extension

    Open-source CLI and a VS Code extension for local work.

  • GitHub & code review

    Repo integration plus automated PR code review.

  • Work from your phone

    Fire off tasks and check progress from the ChatGPT app.

Tier lists featuring this service

Categories aggregate their whole subtree; threads count their own votes. Tap a row to open the tier list.

Not ranked in any tier list yet. Cast the first vote in a thread you care about.

Arena benchmark standings

arena.ai (formerly LMArena) blind-battle results converted into tiers for reference. See each category page for the conversion rules