OpenAI ChatGPT Update: GPT-5 introduces three modes, while the 4o model reverts

OpenAI CEO Sam Altman announced a major update to ChatGPT. GPT-5 introduces three new modes: “Auto,” “Fast,” and “Think,” allowing users to choose according to their needs. The “Think” mode is limited to 3,000 messages per week; once exceeded, users can switch to the mini version, which has a context limit of 196,000 tokens. The 4o model has returned, and paid users can switch between multiple models in the web settings.