Skip to contentGPT-5.1
LegacyVerified ·
The first GPT-5 point release, now legacy; an incremental update over GPT-5 with improved reasoning and tool use.
profile normalized against the 47-model field
Context window· 400K of 1.05M38%
Max output· 100K of 272K37%
Output speed· 82 tok/s26%
Affordability· $12.00 / Mtok out94%
Capability breadth· 7 of 1164%
Capability switches · 7 of 11
Reasoning mode
Tool / function use
Streaming
JSON mode
Structured outputs
Prompt caching
Fine-tuning
Web search
Code execution
Vision input
Audio input
Specifications
Every value carries a primary source and a verification date.
Pricing
Input $/Mtok$1.75 / Mtok USD/Mtok
Cached input $/Mtok$0.175 / Mtok USD/Mtok
Output $/Mtok$12.00 / Mtok USD/Mtok
Performance
Output speed82 tok/s tok/s
Time to first token600 ms ms
Capabilities
Input modalitiesText, image
Tool / function usetrue
Structured outputstrue
General
Knowledge cutoffSeptember 30, 2024
Release dateOctober 21, 2025
Benchmarks
Sourced evaluation scores, each verified against its primary source.
GPQA Diamond
GPQA Diamond: 73.5%
SWE-bench Verified
SWE-bench Verified: 61.7%
AIME 2025
AIME 2025: 82.6%