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Anthropic Context Window (1M)

Anthropic's largest context window is 1M tokens, on Claude Fable 5.

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

1M Context Window AI Models

Model NameContextInputOutputContext Score
Anthropic: Claude Fable 5
1M872K128K70
Anthropic: Claude Fable 5.1
1M872K128K70
Anthropic: Claude Haiku 5.5
1M872K128K70
Anthropic: Claude Opus 4.6
1M872K128K70
Anthropic: Claude Opus 4.7
1M872K128K70
Anthropic: Claude Opus 4.8
1M872K128K70
Anthropic: Claude Opus 5
1M872K128K70
Anthropic: Claude Opus 5.5
1M872K128K70
Anthropic: Claude Sonnet 4.5
1M936K64K70
Anthropic: Claude Sonnet 4.6
1M872K128K70
Anthropic: Claude Sonnet 5
1M872K128K70
Anthropic: Claude Sonnet 5.5
1M872K128K70

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200K Context Window AI Models

Model NameContextInputOutputContext Score
Anthropic: Claude Haiku 4.5
200K136K64K50
Anthropic: Claude Opus 4.1
200K168K32K50
Anthropic: Claude Opus 4.5
200K136K64K50

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Frequently asked questions

How large is the Anthropic context window?

Anthropic's largest context window is 1M tokens, on Claude Fable 5.