Anthropic
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Listed September 2026
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Multimodal Foundation
Claude Opus 5.5
Arena #2 • score 1507 ±8
Proprietary model from Anthropic, listed September 2026. Arena text score 1507 (#2 of 414 entries). $4.00 input / $20.00 output per 1M tokens. 1M tokens context.
Parameters
Not disclosed
Context Window
1M tokens
Input / 1M tokens
$4.00
Output / 1M tokens
$20.00
Benchmark Results
- Arena Text Elo: 1507 (#2 of 414 on arena.ai · ±8 · 6,272 votes · variant: claude-opus-5.5-high)
- AA Intelligence Index: 57.6 (Artificial Analysis v4.3 · best setting: Claude Opus 5.5 (Max, Default Fallback) · checked 2026-10-11)