Skip to contentGPT-5.5 nano
CurrentVerified ·
The smallest and fastest current GPT-5.5 model, built for high-volume, latency-sensitive workloads with a 400K context window.
profile normalized against the 47-model field
Context window· 400K of 1.05M38%
Max output· 64K of 272K24%
Output speed· 195 tok/s61%
Affordability· $0.72 / Mtok out100%
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$0.12 / Mtok USD/Mtok
Cached input $/Mtok$0.012 / Mtok USD/Mtok
Output $/Mtok$0.72 / Mtok USD/Mtok
Performance
Output speed195 tok/s tok/s
Time to first token210 ms ms
Capabilities
Input modalitiesText, image
Tool / function useYes
API
API model IDgpt-5.5-nano
General
Knowledge cutoffJanuary 2026
Benchmarks
Sourced evaluation scores, each verified against its primary source.
GPQA Diamond
GPQA Diamond: 68.9%
SWE-bench Verified
SWE-bench Verified: 54.2%
AIME 2025
AIME 2025: 76.8%