Claude Sonnet 4
Claude Sonnet 4 is developed by Anthropic, released 2025-05-22.
Model ID: claude-sonnet-4-20250514
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
28.9%
Epoch AI · as of 2025-05-22
Epoch FrontierMath (T1–3) accuracy
No public data yet
Arena text rating
1391.0
35th 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)
1448.8
LMArena · as of 2026-11-06
Arena math rating
1390.1
LMArena · as of 2026-11-06
Arena WebDev rating
No public data yet
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/.