GPT 5.1 Thinking (Fast)
By openai
openai/gpt-5.1-thinking-fastAn upgraded version of GPT-5 that adapts thinking time more precisely to the question to spend more time on complex questions and respond more quickly to simpler tasks.
ReleasedNov 12, 2025
Pricing
Pricing (Input)$2.50/M
Pricing (Output)$20.00/M
CachingYes
Limits
Context Length400K
Max Output Tokens128K
Input Modalities
TextSupported
ImageSupported
PDFSupported
AudioNot supported
Output Modalities
TextSupported
ImageNot supported
AudioNot supported
Features
ReasoningSupported
ToolsSupported
TemperatureSupported