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
Compare AI models
Choose two to four models. The table and chart update instantly; every number comes from the leaderboard data.
Data as of Oct 18, 2026 · method 1.0.0
| Metric | GPT-6 Astra | GPT-6.1 Sol | Claude Opus 5.5 | Claude Sonnet 5.5 |
|---|---|---|---|---|
| SI-IQ | 150146–153 | 148144–152 | 144141–148 | 140137–143 |
| Reasoning | 154 | 150 | 146 | 142 |
| Math | 148 | 148 | 145 | 140 |
| Knowledge | 149 | 147 | 137 | 137 |
| Developer | OpenAI | OpenAI | Anthropic | Anthropic |
| Released | Sep 3, 2026 | Sep 29, 2026 | Sep 22, 2026 | Sep 28, 2026 |
| Access | API access | API access | API access | API access |
| Price in / out (USD per 1M tokens) | $10 / $50 | $2.00 / $10 | $4.00 / $20 | $2.00 / $10 |
| Benchmarks used | 9 | 9 | 9 | 9 |
Popular comparisons
- Claude Fable 5.1 vs Claude Opus 5.5
- Claude Fable 5.1 vs Claude Sonnet 5.5
- Claude Fable 5.1 vs Gemini 4 Argon
- Claude Fable 5.1 vs GPT-5.6 Sol
- Claude Fable 5.1 vs GPT-6.1 Sol
- Claude Fable 5.1 vs GPT-6 Astra
- Claude Fable 5.1 vs GPT-6 Sol
- Claude Opus 5.5 vs Claude Sonnet 5.5
- Claude Opus 5.5 vs Gemini 4 Argon
- Claude Opus 5.5 vs GPT-5.6 Sol
- Claude Opus 5.5 vs GPT-6.1 Sol
- Claude Opus 5.5 vs GPT-6 Astra
- Claude Opus 5.5 vs GPT-6 Sol
- Claude Sonnet 5.5 vs Gemini 4 Argon
- Claude Sonnet 5.5 vs GPT-5.6 Sol
- Claude Sonnet 5.5 vs GPT-6.1 Sol
- Claude Sonnet 5.5 vs GPT-6 Astra
- Claude Sonnet 5.5 vs GPT-6 Sol
- DeepSeek V4.1 Flash vs GPT-6 Luna
- Gemini 4 Argon vs GPT-5.6 Sol
- Gemini 4 Argon vs GPT-6.1 Sol
- Gemini 4 Argon vs GPT-6 Astra
- Gemini 4 Argon vs GPT-6 Sol
- GPT-5.6 Sol vs GPT-6.1 Sol
- GPT-5.6 Sol vs GPT-6 Astra
- GPT-5.6 Sol vs GPT-6 Sol
- GPT-6.1 Sol vs GPT-6 Astra
- GPT-6.1 Sol vs GPT-6 Sol
- GPT-6 Astra vs GPT-6 Sol
Data sources: Aider polyglot leaderboard data (Apache-2.0); Arena leaderboard dataset on Hugging Face (CC BY 4.0); Berkeley Function Calling Leaderboard, Gorilla project (Apache-2.0); Epoch AI, ‘Capabilities & benchmarking’ (CC BY 4.0); LiteLLM, model_prices_and_context_window.json (MIT); Source: OpenRouter (openrouter.ai), licensed under CC BY 4.0: reuse and republish with attribution to OpenRouter (licences and changes).