1LLM1
#6AnthropicClosed weights

Claude Opus 5.5

Claude Opus 5.5 scores 57.6 on the Artificial Analysis Intelligence Index (highest reasoning-effort setting). List price $4 input / $20 output per 1M tokens.

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Overall
78.7
Input $/M
$4.00
Output $/M
$20.00
Context
1M
Released
Sep 22, 2026
Updated
Oct 3, 2026

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