Codex
Codex
Delegate a task, come back to a diff with logs and test citations.
Updated
The read
Codex is a delegation tool rather than an assistant. You hand over a task, it works in an isolated sandbox for minutes or hours, and it returns a diff along with the logs and test evidence for what it did. That receipt is the real feature, because reviewing agent work is the actual bottleneck. It reaches you from the web, a command line, an editor extension and a phone, and it comes with every ChatGPT plan including the free one. The move to credit pricing makes heavy months harder to forecast.
Where it shines
- Returns logs and test citations, so review is not guesswork
- Included with every ChatGPT plan, the free one included
- Reachable from web, command line, editor and phone
Worth knowing first
- Credit pricing makes a heavy month hard to forecast
- Sandbox isolation means it cannot touch your local environment
Index score
78.7
Provisional. This score is read from the product's public capability, not from the one-prompt rebuild the fully reviewed entries went through, so treat it as a placing rather than a verdict.
- Rank
- 11 of 54
- Builds
- Tools
- Category
- Coding agent
- Output
- A reviewable diff with logs and test citations
- Pricing
- Free tier
- Best for
- Handing off a task and reviewing the result
Scores are our own editorial judgement, weighted craft 30, speed 25, control 25 and value 20.
Compare it with
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