OpenAI Simplifies ChatGPT Lineup

OpenAI has trimmed ChatGPT’s public model picker and moved more users onto GPT-5.3 as the default experience. (help.openai.com) The company’s help center says GPT-4o, GPT-4.1, GPT-4.1 mini, OpenAI o4-mini, and GPT-5 Instant and Thinking were retired from ChatGPT on February 13, 2026. The same notice says application programming interface access to those models did not change. (help.openai.com) OpenAI now describes GPT-5.3 in ChatGPT as the default for all logged-in users and calls it a single auto-switching system. The same page says GPT-5.3 Instant is the everyday model and GPT-5.4 Thinking is reserved for harder reasoning work. (help.openai.com) In plain terms, ChatGPT is narrowing the number of model names most people see in the app while keeping a larger catalog behind the scenes for developers. OpenAI’s separate retirement notice says the goal is to focus on the models “most people use today.” (openai.com) That split matters because ChatGPT and the application programming interface now operate more like two different storefronts. The consumer product is being simplified around fewer choices, while the developer platform still offers older models for teams that built tools around them. (help.openai.com) (openai.com) OpenAI also set a deadline for one major exception. Help-center pages for Business, Enterprise, and Edu said those customers could keep using GPT-4o inside Custom GPTs until April 3, 2026, before a full retirement across all plans. (help.openai.com 1) (help.openai.com 2) As of April 12, 2026, that April 3 date has passed. OpenAI’s current help pages now say GPT-4o is fully retired across all plans in ChatGPT, even though older-model access in the application programming interface remains available. (help.openai.com 1) (help.openai.com 2) The cleanup has unfolded in stages, not all at once. OpenAI’s model release notes say GPT-5.1 Instant, Thinking, and Pro were removed from ChatGPT on March 11, 2026, and old chats were mapped onto newer replacements such as GPT-5.3 Instant and GPT-5.4 Thinking. (help.openai.com) OpenAI is still adding hidden fallback models even as it removes visible options. On April 9, 2026, the company said GPT-5.3 Instant Mini replaced GPT-5 Instant Mini as the fallback after users hit GPT-5.3 Instant rate limits, and it would not appear in the model picker. (help.openai.com) For ChatGPT users, the result is a shorter list of names and more automatic routing. For developers and enterprise buyers, the result is continuity in the application programming interface even as the main ChatGPT app sheds older labels. (help.openai.com) (openai.com)