Preview reasoning-enabled chat model with built-in problem-solving for conversational interfaces.
Context Window
128K tokens
≈ 96K words
Input Price
$1.25
per 1M tokens
Output Price
$10
per 1M tokens
Released
November 2025
Preview reasoning chat model with built-in reasoning capabilities for conversational AI.
API identifier
gpt-5.1-chatCompare GPT-5.1 Chat side-by-side with any other model
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