ChatGPT announced that on October 14, 2026, GPT-5.5 will leave ChatGPT, ChatGPT Work, and Codex across all plans; Codex users should switch to GPT-5.6 Sol or GPT-6 Astra. OpenAI Developers clarified that GPT-5.5 remains available via the OpenAI API Platform and in Codex sessions authenticated with an API key.

Key Takeaways

  • โœ“Oct 14: GPT-5.5 exits ChatGPT, ChatGPT Work, and Codex across all plans.
  • โœ“Codex plan users should move to GPT-5.6 Sol or GPT-6 Astra.
  • โœ“GPT-5.5 stays on the API Platform and in API-key-authenticated Codex sessions.
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