GPT-5.1
OpenAI · November 2025
● activeClosedsparse moemultimodalAPI Available
Context Window400K tokens
Description
Incremental update to GPT-5 with improved adaptive reasoning — the model dynamically adjusts how much 'thinking' it does based on question difficulty. Achieved near-perfect scores on graduate-level math benchmarks.
Key Innovations
Reasoning
ReasoningStructured step-by-step problem solving, often using chain-of-thought or tree-of-thought approaches.