OpenAI product changes noted

OpenAI has removed GPT-5 Instant, GPT-5 Thinking, GPT-4o, GPT-4.1, GPT-4.1 mini, and OpenAI o4-mini from ChatGPT as of February 13, 2026. (help.openai.com) The company said those retirements apply to ChatGPT, not the application programming interface used by developers, where access “remains unchanged.” OpenAI’s Help Center says Business, Enterprise, and Edu customers kept GPT-4o inside Custom GPTs until April 3, 2026. (help.openai.com) OpenAI also said GPTs that use retired models are moved automatically to the nearest replacement, which it lists as GPT-5.3 Instant or GPT-5.4 Thinking and Pro equivalents. Voice mode and ChatGPT Images are not part of this retirement, according to a separate Help Center article. (help.openai.com) A model in ChatGPT is the engine behind a conversation, and a Custom GPT is a user-built version with its own instructions, files, and tools. When OpenAI retires a model from ChatGPT, people can still keep using ChatGPT, but the engine under older chats and GPTs may change. (help.openai.com) That matters for users who built workflows around specific model behavior. OpenAI’s model release notes say GPT-4.1 was added to ChatGPT because it “excels at coding tasks,” which means its removal from the ChatGPT picker changes the options available to people choosing models inside the app. (help.openai.com) OpenAI’s public release notes also say GPT-5 is rolling out across ChatGPT Plus, Pro, Team, and Free plans on web, mobile, and desktop. The same note says Enterprise and Edu availability is still “soon,” showing that model access now differs by plan and by product surface. (help.openai.com) For GPTs with Custom Actions, OpenAI’s release notes say the supported models on the web are GPT-4o and GPT-4.1 for Plus, Pro, and Team plans. The same note lists Enterprise and Edu support as “coming soon.” (help.openai.com) OpenAI’s Enterprise and Edu release notes show that support is still shifting. On April 9, 2026, the company said Enterprise and Edu users “can now choose from the full set of ChatGPT models” when building Custom GPTs, including GPT-4o, o3, and o4-mini. (help.openai.com) The result is a split between ChatGPT’s consumer-facing model picker and the tools used to build GPTs and developer apps. OpenAI is narrowing the list of default chat models while keeping older options alive longer in the application programming interface and, in some cases, in GPT-building tools. (help.openai.com)