GPT-5.1 is an AI model released by OpenAI on Nov 12 2025, 4 days after GPT-5-Codex-Mini. It is the 24th tracked release from OpenAI out of 33 total.
On published benchmarks, it scores 88.1% on GPQA Diamond (graduate-level science reasoning), 76.3% on SWE-Bench Verified (real-world software engineering), 76% on MMMU (multimodal understanding).
About OpenAI: Creators of ChatGPT and the GPT series of models. Pioneered large-scale language model research.