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OpenAI Codex CLI

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OpenAI's official terminal coding agent; adopts the SKILL.md standard.

open source freemium https://github.com/openai/codex ↗ repo ↗ 
Codex CLI is OpenAI's open-source terminal coding agent. Adopted the SKILL.md standard so it can run the same skills as Claude Code. Common when teams already standardize on the OpenAI platform.

Strengths

  • Adopts cross-vendor SKILL.md standard
  • Open source
  • Native OpenAI Responses API integration

Tradeoffs

  • Smaller plugin ecosystem than Claude Code

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