Claude Sonnet 5
Claude Sonnet 5 is an API-only (closed weights) language model from Anthropic, released June 30, 2026. The context window is 1M tokens. On the Epoch Capabilities Index it scores 156.9, rank 33 of 256 rated models. API price: $2 input / $10 output per million tokens.
Claude Sonnet 5 is built to be the most agentic Sonnet model yet. It can make plans, use tools like browsers and terminals, and run autonomously at a level that, just a few months ago, required larger and more expensive models.
Check it against your own PC →
Strengths by category
ModelTape's 0–100 fit on Epoch AI benchmark results.
| Category | Score | Based on |
|---|---|---|
| Reasoning | 22.8 | Chess Puzzles, SimpleBench, Mystery Game Puzzles |
| Math | 58.4 | ProofBench, OTIS Mock AIME 2024-2025, FrontierMath-Tiers-1-3-v2-Private, FrontierMath-Tier-4-v2-Private |
| Coding | 62.9 | GSO-Bench, MirrorCode, DeepSWE |
| Knowledge | 71.1 | GPQA diamond, SimpleQA Verified |
Benchmark results
| Benchmark (Epoch AI) | Score |
|---|---|
| OTIS Mock AIME | 94.7% |
| GPQA Diamond | 91.0% |
| ProofBench | 77.0% |
| FrontierMath (Tiers 1–3) | 69.1% |
| MirrorCode | 63.3% |
| DeepSWE | 53.8% |
| SimpleBench | 52.7% |
| Chess Puzzles | 42.1% |
| GSO-Bench | 37.3% |
| SimpleQA Verified | 33.7% |
| FrontierMath-Tier-4-v2-Private | 29.3% |
| Mystery Game Puzzles | 28.4% |
Links
Announcement · Epoch AI benchmarks
Models with a similar score
GPT-5.6 Terra · Claude Haiku 5.5 · GPT-5.4 Pro · GPT-5.5 · Claude Opus 4.8 · DeepSeek V4.1 Flash 1017 · Gemini 3.8 Flash · Kimi K3
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 Fable 5 · Claude Mythos 5