Claude Sonnet 4
Claude Sonnet 4 is an API-only (closed weights) language model from Anthropic, released May 22, 2025. On the Epoch Capabilities Index it scores 141.9, rank 112 of 256 rated models.
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Lab
Anthropic
Released
May 22, 2025
Weights
API-only (closed weights)
Parameters
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Context
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Price / M tokens
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Epoch ECI
141.9 #112
Strengths by category
ModelTape's 0–100 fit on Epoch AI benchmark results.
| Category | Score | Based on |
|---|---|---|
| Reasoning | 12.5 | SimpleBench, Humanity's Last Exam |
| Math | 31.7 | MATH level 5, OTIS Mock AIME 2024-2025, FrontierMath-2025-02-28-Private, FrontierMath-Tier-4-2025-07-01-Private |
| Coding | 39.7 | Aider polyglot, GSO-Bench |
| Agent | 25.4 | The Agent Company, OSWorld |
Benchmark results
| Benchmark (Epoch AI) | Score |
|---|---|
| MATH level 5 | 84.4% |
| GPQA Diamond | 75.3% |
| OTIS Mock AIME | 71.1% |
| Aider Polyglot | 61.3% |
| OSWorld | 43.9% |
| SimpleBench | 34.6% |
| The Agent Company | 33.1% |
| Humanity's Last Exam | 7.8% |
| FrontierMath-2025-02-28-Private | 7.3% |
| GSO-Bench | 4.9% |
| FrontierMath-Tier-4-2025-07-01-Private | 0.0% |
Links
Models with a similar score
Gemini 3.5 Flash-Lite · Kimi K2 Thinking · o4-mini · Gemini 3.1 Flash-Lite · Gemini 2.5 Pro (Jun 2025) · Claude Opus 4.1 · DeepSeek-V3.2-Exp · Grok 4 Fast
More from Anthropic
Claude Fable 5.2 · Claude Haiku 5.5 · Claude Sonnet 5.5 · Claude Opus 5.5 · Claude Fable 5.1 · Claude Opus 5 · Claude Sonnet 5 · Claude Fable 5