Tools/Coding agentFree tiermoderate

Codex

OpenAI's coding agent — hand off tasks from web, IDE, terminal, or your phone

Codex is OpenAI's autonomous coding agent, powered by the GPT-5 model family. It runs multi-step tasks — building features, fixing bugs, opening pull requests — in isolated cloud sandboxes wired to your GitHub repos, and can run several tasks in parallel. Drive it from the web, the VS Code extension, the CLI, or iOS. It's bundled into ChatGPT plans, so if you subscribe to ChatGPT you may already have it.

Pricing

Bundled with ChatGPT: limited free tier; Go $8/mo; Plus $20/mo; Pro $100–200/mo for 5–20× capacity. Credits refill on a rolling 5-hour window.

Last verified July 28, 2026 — pricing changes often; trust the date, not the internet.

Where it shines

Works everywhere: web, VS Code extension, CLI, and iOS
Cloud agents run tasks in parallel against your GitHub repos
Bundled into ChatGPT plans — you may already have it
Strong at PR-sized tasks and code-review automation

Honest trade-offs

Usage is credit-metered — heavy use hits the 5-hour window caps
Cloud-sandbox model gives less direct control than a local-first agent
Happiest in a GitHub-centric workflow

Best for: ChatGPT subscribers who want an agent shipping PRs while they do something else

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