o4-mini
OpenAI · April 2025
⚠ deprecatedCloseddecoder onlymultimodalAPI Available
Context Window200K tokens
Sunset DateFebruary 2026
Description
A compact, cost-efficient reasoning model that delivers strong performance at a fraction of o3's cost. Designed for applications that need solid reasoning ability but can't justify the compute expense of the full-size models. Supports multimodal inputs including images.
Benchmark Scores
GPQAGraduate-level science QA
83.3%AIMEAMC/AIME math competition
95.2%Key Innovations
Reasoning
ReasoningStructured step-by-step problem solving, often using chain-of-thought or tree-of-thought approaches.
Test-Time Compute
Test-Time ComputeUsing extra computation during inference (not training) to improve answer quality — thinking longer on harder problems.
Tool Use
Tool UseAbility to call external tools, APIs, and functions — enabling web browsing, code execution, and real-world actions.
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Related Research (1)
Ten Advances in Mathematics and Theoretical Computer ScienceReasoning
2026 · OpenAI
Showcased AI solving complex mathematical problems with Lean-formalized proofs, achieving breakthroughs in problems that had seen no progress for deca…