GPT-5.1 Chat (AKA Instant is the fast, lightweight member of the 5.1 family, optimized for low-latency chat while retaining strong general intelligence. It uses adaptive reasoning to selectively “think” on...
Developer
OpenAI
Release Date
November 13, 2025
Context Window
128,000 tokens≈ 171 words
API Access
Publicly AvailableIntegrate via official API
Input Cost
$1.25per million tokens
Output Cost
$10.00per million tokens
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