[OpenAI: Discontinued Use of Five Older ChatGPT Models] According to Jinshi News, OpenAI announced that as of February 13 (local time), it has discontinued the use of five older ChatGPT models, including GPT-4o, GPT-4.1, GPT-4.1 mini, OpenAI o4-mini, and GPT-5 (Instant and Thinking versions). ChatGPT Enterprise workspaces will retain access to the GPT-5 model until February 19, 2026. Additionally, GPT-5 Pro will remain available to all paid users until February 19, 2026. These models will continue to be accessible in the future via the OpenAI API.