Claude Opus 4.1
Claude Opus 4.1 is developed by Anthropic, released 2025-08-05.
Model ID: claude-opus-4-1-20250805
Input price
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Output price
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Blended price
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Epoch Capabilities Index (ECI)
No public data yet
Epoch Mock AIME accuracy
40.0%
Epoch AI · as of 2025-08-05
Epoch FrontierMath (T1–3) accuracy
No public data yet
Arena text rating
1448.1
69th percentile of 164 models with an Arena text rating score
LMArena · as of 2026-11-06
Arena coding rating (human preference votes, not task accuracy)
1504.5
LMArena · as of 2026-11-06
Arena math rating
1432.7
LMArena · as of 2026-11-06
Arena WebDev rating
1389.7
LMArena · as of 2026-11-06
No API price is published for this model in our data sources (models.dev,
LiteLLM), so we show — rather than guess. It may be unreleased via API, open-weights
only, or simply not tracked yet.
See all of Anthropic's models on its provider page, or browse the full model directory. Full source licenses and sync dates: /data-sources/.