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OpenAI: o3 Pro Context Window

o3 Pro has a context window of 200K tokens. Its context score is 50.

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

Context
200K
Context score
50

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Frequently asked questions

How large is the o3 Pro context window?

o3 Pro has a context window of 200K tokens. Its context score is 50.