Model dossier

Anthropic: Claude Opus 5.5

Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code...

ProviderAnthropic Start comparison

Context1,000,000

Max output128,000

Pricing viewTVP price

Identity

Anthropic: Claude Opus 5.5

Model ID: anthropic/claude-opus-5.5
Canonical slug: anthropic/claude-opus-5.5-20260921
Knowledge cutoff: n/a
Created: 9/22/2026

Capabilities

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Modalities

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Capacity

Context1,000,000

Max output128,000

TokenizerClaude