Per OpenAI's model docs, GPT-5.5 retires from ChatGPT, ChatGPT Work and Codex on all plans on 2026-10-14; the OpenAI API is not affected. Codex users on ChatGPT sign-in should pick gpt-6-sol (Plus, Pro, Business, Enterprise, Edu) or gpt-6-luna in the desktop app (Free, Go), with gpt-6.1-sol recommended for complex coding. Any config.toml, custom agent, scheduled task or script pinned to gpt-5.5 needs updating now.

Key Takeaways

  • ✓Effective 2026-10-14: GPT-5.5 leaves ChatGPT, ChatGPT Work and Codex on every plan; the OpenAI API is unaffected
  • ✓Replacements: gpt-6-sol for Plus/Pro/Business/Enterprise/Edu, gpt-6-luna in the desktop app for Free/Go (both 'when available')
  • ✓For complex coding OpenAI recommends gpt-6.1-sol, near-Astra at 1/5 of Astra's standard price per OpenAI
  • ✓Check 4 places: model in config.toml, codex exec -m, custom agents, scheduled tasks and scripts
  • ✓Enterprise/Edu admins must enable newer models first; GPT-5.6 Sol/Terra/Luna remain available during the rollout
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Project Links & Resources

Direct Access
Direct access to official project resources and documentation
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OpenAI Codex / ChatGPT models documentation (GPT-5.5 retirement)
learn.chatgpt.com/docs/models
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Introducing GPT-6.1 Sol (OpenAI)
openai.com/index/introducing-gpt-6-1-sol/
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GPT-6.1 Sol API model page
developers.openai.com/api/docs/models/gpt-6.1-sol
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In-Depth Technical Analysis

OpenAI's Codex model documentation states that GPT-5.5 retires from ChatGPT, ChatGPT Work and Codex on all plans, including Business, Enterprise and Edu, on October 14, 2026. The retirement does not apply to the OpenAI API. Codex users on ChatGPT sign-in should choose GPT-6 Sol (gpt-6-sol) on Plus, Pro, Business, Enterprise and Edu, or GPT-6 Luna (gpt-6-luna) in the desktop app on Free and Go, both 'when available'. For complex coding and agentic work the docs recommend GPT-6.1 Sol, which OpenAI positions as near GPT-6 Astra at one-fifth of Astra's standard price. In Enterprise and Edu, newer models are off until an admin enables them, and choosing a model locally does not grant access. GPT-5.6 Sol, Terra and Luna stay available during the rollout. The practical risk is unattended configuration: search for gpt-5.5 in config.toml, codex exec -m invocations, custom agents and scheduled tasks, switch to gpt-6.1-sol or the plan-appropriate replacement, and move anything that truly depends on GPT-5.5 to the API while you regression-test.

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