ModelsGPT-5.1 Thinking

GPT-5.1 Thinking

by OpenAI

Premium

Complex reasoning, large context, state-of-the-art performance

Pricing
Input
$1.25
per 1M tokens
Output
$10.00
per 1M tokens
Cached
$0.125
per 1M tokens
Note: Released Nov 12, 2025. Advanced reasoning model, easier to understand
Context & Output
Context Window272K tokens
Max Output128K tokens
Latency
Adaptive
Capabilities
Multimodal
Streaming
Function Calling
Prompt Caching
Key Strengths
What makes this model stand out
Advanced reasoning
Faster on simple tasks
More persistent on complex
Try GPT-5.1 ThinkingCompare All Models
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