Claude Sonnet 5.5

anthropic/claude-sonnet-5-5

Everyday Claude agent model with improved speed and lower cost for coding, planning, browsing, and general work.

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Context window: 1M
Input: Document · Image · Text
Output: Text
Released: 2026-09-28

Max output: 128K
Model parameters: 0
Active parameters: 0
Weights: Closed
Capabilities: Attachments, Reasoning, Tool call

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Performance

Overall capability

73.4/100

Coding: 75.9
Reasoning: 73.8
Professional work: 67.5
Knowledge & language: 65.2


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Vibe Code Bench v1.1	Coding	Vals AI	2026-11-05
SciCodeClaude Sonnet 5.5 (Max, Default Fallback)	Coding	Artificial Analysis	2026-11-05
Terminal-Bench 4.0 (AA rerun)Claude Sonnet 5.5 (Max, Default Fallback)	Coding	Artificial Analysis	2026-11-05
Terminal-Bench 4.0 (Vals rerun)	Coding	Vals AI	2026-11-05

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ModelRegistry · Catalog updated 2026-11-10