The convergence of scale and reasoning
Product AnnouncementReleased GPT-5, unifying the GPT and o-series into a single model with auto/fast/thinking modes. Replaced GPT-4o, o3, o4-mini, and GPT-4.1 as the new default in ChatGPT, representing the convergence of scale and reasoning.
GPT-5 combined the broad knowledge and fast inference of the GPT series with the reasoning capabilities of the o-series. Users could choose between "Auto" (model decides how much to think), "Fast" (optimized for speed), and "Thinking" (extended reasoning) modes.
GPT-5 replaced GPT-4o, GPT-4.1, GPT-4.1 mini, o3, and o4-mini in ChatGPT. One model for everything.
Full text, image, audio, and video input/output in a single model.
Developers could use GPT-5 directly from the command line for coding tasks.