Anthropic: Claude Opus 5.5 Context Window
Claude Opus 5.5 has a context window of 1M tokens. Its context score is 70.
Data sourced from OpenRouter API and manual data collection | Last updated: Nov 3, 2026, 8:01 AM UTC
Context
1M
Context score
70
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Frequently asked questions
How large is the Claude Opus 5.5 context window?
Claude Opus 5.5 has a context window of 1M tokens. Its context score is 70.