OpenAI Codex
An autonomous coding agent integrated into ChatGPT that handles everything from planning to execution.
An autonomous coding environment integrated into ChatGPT. Rated for the polish of working across CLI, IDE, and cloud.
| Category | Development & Coding |
|---|---|
| Pricing | Included with paid ChatGPT plans (Plus from $20/month) |
| Japanese support | β |
| Maker | OpenAI |
What it does: Works across the CLI, IDE extensions, and a cloud sandbox, planning coding work and carrying it out automatically.
Who it's for: People who already use ChatGPT and want serious development support.
Strengths: No separate purchase needed; it's included in paid ChatGPT plans. A direct rival to Claude Code.
Watch-outs: There are usage-based caps. Checking the generated code is essential.
* Pricing and features change; check the official site for the latest, accurate details. β ratings and "our verdict" are the editorial team's subjective opinion.