Codex
OpenAI's coding agent (CLI + cloud) with parallel tasks, built on the GPT-5 series.
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Our review
Codex is OpenAI's coding agent with a CLI and cloud parallel tasks, built on the GPT-5 series with leading benchmarks, deeply integrated with ChatGPT and multilingual.
It has quota limits, is occasionally verbose, and needs a subscription; but for developers already in ChatGPT who want a strong coding agent that runs tasks in parallel, Codex is a first-tier pick.
Pros
Cons
Key features
Best for
FAQ
What is Codex?
OpenAI's coding agent (CLI + cloud) with parallel tasks, built on the GPT-5 series.
What are the pros and cons of Codex?
Pros: ChatGPT integration, Parallel cloud tasks, Benchmark-leading, Multi-language. Cons: Quota limits, Sometimes verbose, Requires subscription.
How much does Codex cost?
Plus: $20/mo; Pro: $200/mo.
Who is Codex for?
Best for Automated development, Task delegation, Code review.
What are the alternatives to Codex?
Consider Claude Code, Cursor, Devin.