OpenAI has announced the withdrawal of GPT-5.5 starting from October 14, across ChatGPT, Work and Codex on all plans. For the majority of users the change will go unnoticed, but those who built specific workflows around this model will need to intervene manually before the deadline.
OpenAI Withdraws GPT-5.5: automatic transition for ChatGPT, manual action for Codex
For standard ChatGPT users the transition will be completely seamless: existing conversations will automatically migrate to the new default model, with no intervention required.
The story changes for those using Codex, particularly developers who have set up specific workflows around GPT-5.5: before October 14 it will be necessary to update the workspace’s default settings, the saved and managed configurations, the custom agents, the scheduled tasks, and any scripts that explicitly call GPT-5.5.
API calls remain unchanged
OpenAI notes that authenticated API calls via an API key are not affected by the withdrawal and will continue to function normally even after October 14. This is an important distinction for those integrating OpenAI models into third-party products or services via API, which can continue to operate without urgent changes tied to this specific announcement.
GPT-5.6 Sol and GPT-6 Astra as reference after the withdrawal
As alternatives after the discontinuation of GPT-5.5, OpenAI points to GPT-5.6 Sol and GPT-6 Astra. Note that GPT-5.5 was launched just on April 23, 2026, a sign of a relatively short life cycle for a flagship model, in line with the increasingly rapid update pace adopted by the company in recent months.
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