Overview
As of February 13, 2026, ChatGPT retired the following models:
GPT-4o
GPT-4.1
GPT-4.1 mini
OpenAI o4-mini
GPT-5 (Instant and Thinking), as previously announced
As of March 11, 2026, ChatGPT retired the following models:
GPT-5.1 Instant
GPT-5.1 Thinking
GPT-5.1 Pro
ChatGPT Enterprise workspaces will retain access to GPT-5 models through February 19, 2026. GPT-5 Pro will also remain available to all paid users through February 19.
What’s changing
These models will no longer be available for use in ChatGPT.
GPT-5.1 models were retired on March 11, 2026 across both normal chats and GPTs.
They will continue to be available through the OpenAI API, and we’ll provide advance notice ahead of any future API retirements.
ChatGPT Business, Enterprise, and Edu customers will retain access to GPT-4o within Custom GPTs until April 3, 2026. After April 3, GPT-4o will be fully retired across all plans.
Learn more
For additional background on this decision and what’s coming next, please refer to our blog post: Retiring GPT-4o, GPT-4.1, GPT-4.1 mini, and OpenAI o4-mini in ChatGPT
FAQ
What happens to my conversations I have with GPT-4o or other deprecated models?
Conversations and projects are defaulted to their GPT-5.3 Instant and GPT-5.4 Thinking and Pro equivalents going forward.
What happens to my GPTs?
GPTs using retired models will automatically move to the closest GPT-5.3 Instant and GPT-5.4 Thinking and Pro equivalent.
Will voice mode still run on GPT-4o?
ChatGPT Voice is not changing as part of this update. While voice uses a similar base model as GPT-4o, it’s ultimately a different model from the text GPT-4o model being retired.
Will ChatGPT Images still run on GPT-4o?
ChatGPT Images is not changing as part of this update. While image generation uses a similar base model as GPT-4o, it’s ultimately a different model from the text GPT-4o model being retired.