OpenAI Codex
OpenAI's coding agent for terminal, IDE, web and desktop.
What it is
Codex is included in ChatGPT plans: limited trial access on Free and Go, expanded usage on Plus ($20) and Pro (from $100). Cloud features such as automatic code review start at Plus.
Pricing
Free / GoLimited trial access in the desktop app, subject to rollout
$0 / $8/moPlusWeb, CLI, IDE extension, iOS; cloud code review
$20/moProHigher usage for full workdays
$100 / $200 / $500/moAPI keyFor CI and automation
pay per useSource: official pricing page. Prices checked Nov 5, 2026. Prices change often.
Sources and caveats
Caveats
- OpenAI's two Codex pricing pages disagree on whether GPT-5.5 is still listed; the developer docs state it was retired for ChatGPT sign-in on Oct 14, 2026.
We read these pages for prices and plan details. Feature descriptions summarise what the vendor says and were not tested by us; pros, cons and scores are our opinion. These are third-party sites with their own terms; linking to them does not imply any affiliation.
Pros
- No separate subscription if you already pay for ChatGPT
- Works in CLI, IDE extension, web and desktop app
- API-key mode for CI
Cons
- Usage draws from one allowance shared with ChatGPT Work
- Free and Go only get limited trial access, without cloud features
- Model lineup changes fast: GPT-5.5 was retired from Codex with ChatGPT sign-in on Oct 14, 2026 (API-key use unaffected)
Where it ranks
Rankings aren't paid for. UseWhich has no affiliate links or sponsored placements today; if any are added, they will be clearly labelled. Scores are UseWhich editorial judgments based on published features, pricing and public track record. They are not lab benchmarks.