OpenAI Codex CLI
According to AI Tier List, OpenAI Codex CLI is rated Tier A for Coding & Development. How we rank →
CLI coding tool included with ChatGPT Plus
OpenAI Codex CLI comes included with ChatGPT Plus ($20/month) for great value. GPT-5.1-Codex achieves 77% on SWE-bench at ~50% lower cost per token vs Claude. Supports cloud agent mode.
Best For
Tier Reason
Included with ChatGPT Plus at no extra cost. Solid 77% on SWE-bench. Cloud agent mode enables async work.
Strengths
Included with ChatGPT Plus (no extra cost), 50% cheaper than Claude, cloud agent mode, GPT-5.1 performance
Weaknesses
Less autonomous than Claude Code, CLI-only, locked into OpenAI ecosystem
Recent Changes
Achieved 77% on SWE-bench with GPT-5.1-Codex model, added cloud agent mode
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