Topic · Product
Codex
Codex is OpenAI's coding agent, available in the terminal, in editors, in the cloud and inside ChatGPT. The name is older than the product: OpenAI used it in 2021 for a code-generation model that powered the first GitHub Copilot, and reused it in 2025 for the agent covered here.
Fact file
Codex CLI introducedApril 16, 2025 (open source)
Codex cloud agentMay 16, 2025 (codex-1)
CLI licenseApache-2.0
Plan access (per OpenAI)Included in ChatGPT plans; Plus $20/mo; Pro $100, $200 or $500/mo; Business $20/user/mo billed annually or $25 monthly (2+ seats)
Codex CLI version0.162.0 (npm latest, published October 8, 2026)
Original 2021 Codex modelAnnounced August 10, 2021; deprecated March 2023
Latest on Codex
Oct 9Agents · ExplainerWhat "agentic" really means in 2026
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Timeline
MAY 2025Codex cloud agent
APR 2025Codex CLI introduced