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OpenAI: GPT-5.1 Context Window

GPT-5.1 has a context window of 400K tokens. Its context score is 59.

Data sourced from OpenRouter API and manual data collection | Last updated: Nov 3, 2026, 8:01 AM UTC

Context
400K
Context score
59

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Frequently asked questions

How large is the GPT-5.1 context window?

GPT-5.1 has a context window of 400K tokens. Its context score is 59.