Context Window
400K tokens
Parameters
Undisclosed
Source
Closed
Modality
Text, Vision, Code
GPT-5.1 Instant is OpenAI’s high-throughput model optimized for low latency and high tokens-per-second output. Ideal for streaming chat interfaces.
Specifications
Technical details
Developer
OpenAI
Model Family
GPT-5
Parameters
Undisclosed
Context Window
400,000 tokens (400K)
Modality
Text, Vision, Code
Open Source
No
License
Proprietary
API Available
Yes
Release Date
November 12, 2025
Pricing
$2.22 blended per M tokens