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OpenAI Codex CLI

Open Source
CLI Coding Tools
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OpenAI's official CLI for GPT-5.5. Features session compaction for multi-million token deep sessions. Free with ChatGPT Plus ($20/mo) or Pro ($200/mo).

Supported Models

GPT-5.5GPT-5.5 Pro (Pro tier)

Key Features

  • Session compaction
  • GPT-5.5 models
  • Pay-as-you-go API
  • Open source

Pros

  • Official OpenAI tool
  • Session compaction
  • Open source

Cons

  • Requires ChatGPT subscription
  • Limited free tier

Best Use Cases

OpenAI ecosystemResearchDeep reasoning tasks