OpenAI promised developers six months’ notice. GPT-4o users got three.
The New Stack 1 day ago 37
OpenAI will retire GPT-4o, GPT-4o mini, GPT-4.1, and GPT-4.1 mini from its API on January 14, 2027, including dated snapshots and fine-tunes based on them. The deprecation notice delivered Wednesday gives developers about 3 months to migrate production traffic. Developers must move to GPT-6 Luna and adjust API usage and settings because tool-calling and reasoning behavior differs, including limits on temperature/top_p/logprobs and the need to use the Responses API for combined reasoning plus tools.