o3-pro

OpenAI retired the o3 model family from ChatGPT on August 26, 2026, ending a 90-day sunset period that began with the May 28 announcement, forcing developers and enterprises to migrate workflows to th…

A new approach called Auto-Fill, which post-trains three specialist small language models (SLMs) for world knowledge, text-based reasoning, and code-based reasoning, achieves superior accuracy in pred…