Automated page. Written and translated automatically by AI and checked against the sources by software; no human editor. SI-IQ is an index built from public benchmark results, not an IQ test. How it works
How smart is Claude Sonnet 5?
Claude Sonnet 5 is a model from Anthropic, released on Jun 30, 2026. Its SI-IQ is 126 (90% interval 123–129), estimated from 8 benchmark results by 2 independent evaluators. Its strongest area is Reasoning and its weakest is Knowledge.
Facts
- Developer
- Anthropic
- Released
- Jun 30, 2026
- Access
- API access
- Benchmarks used
- 8 results from 2 evaluators
- API price
- $2.00 input / $10 output per 1M tokens (developer's price list, Oct 18, 2026)
- Context window
- 1,000,000 tokens
Ability by area (SI-IQ, 90% interval)
Every benchmark result we used
Each score is one value exactly as the source published it: for Epoch AI the best of its run settings, for OpenRouter the median hosting provider (the developer's own hosting when it ran the test). “Implied SI-IQ” is the ability that this single result points to; the overall SI-IQ is their precision-weighted average.
| Benchmark | Score | Evaluated by | Source |
|---|---|---|---|
| Chess Puzzles | 45.0% | Epoch AI | Epoch AI Benchmarking Hub · data file |
| Mystery Game Puzzles | 35.0% | Epoch AI | Epoch AI Benchmarking Hub · data file |
| FrontierMath Tier 4 | 29.3% | Epoch AI | Epoch AI Benchmarking Hub · data file |
| FrontierMath Tiers 1–3 | 65.6% | Epoch AI | Epoch AI Benchmarking Hub · data file |
| OTIS Mock AIME 2024–2025 | 94.7% | Epoch AI | Epoch AI Benchmarking Hub · data file |
| GPQA Diamond | 90.5% | Epoch AI | Epoch AI Benchmarking Hub · data file |
| GPQA Diamond (OpenRouter run) | 85.8% | OpenRouter | OpenRouter benchmark datasets · data file |
| SimpleQA Verified | 33.7% | Epoch AI | Epoch AI Benchmarking Hub · data file |
| τ²-bench Airline (OpenRouter run) | 76.0% | OpenRouter | OpenRouter benchmark datasets · data file |
Models with similar SI-IQ
| Model | SI-IQ | |
|---|---|---|
| Grok 4.6xAI | 126 | Claude Sonnet 5 vs Grok 4.6 |
| Gemini 3.5 FlashGoogle DeepMind | 126 | Claude Sonnet 5 vs Gemini 3.5 Flash |
| Gemini 3.1 ProGoogle DeepMind | 127 | Claude Sonnet 5 vs Gemini 3.1 Pro |
| GLM-5.3Z.ai (Zhipu AI) | 125 | Claude Sonnet 5 vs GLM-5.3 |
| Claude Opus 4.7Anthropic | 127 | Claude Sonnet 5 vs Claude Opus 4.7 |
Computed with SI-IQ method version 1.0.0. Read the full methodology
Data sources: Epoch AI, ‘Capabilities & benchmarking’ (CC BY 4.0); API list prices via LiteLLM's price table (MIT); each price links to the developer's pricing page; Source: OpenRouter (openrouter.ai), licensed under CC BY 4.0: reuse and republish with attribution to OpenRouter..