1LLM1
#2AnthropicClosed weights

Claude Sonnet 5.5

Claude Sonnet 5.5 scores 56.0 on the Artificial Analysis Intelligence Index (highest reasoning-effort setting). List price $2 input / $10 output per 1M tokens.

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Overall
81.9
Input $/M
$2.00
Output $/M
$10.00
Context
1M
Released
Sep 28, 2026
Updated
Oct 3, 2026

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