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.
| 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 | 8 | 8 | 8 | 8 |
Benchmarks every compared model was tested on
Raw scores as published by the evaluators.
| Benchmark | GPT-6 Astra | GPT-6.1 Sol | Claude Opus 5.5 | Claude Sonnet 5.5 |
|---|---|---|---|---|
| Chess Puzzles | 74.0% | 68.0% | 67.0% | 59.0% |
| FrontierMath Tier 4 | 97.6% | 100.0% | 95.0% | 80.5% |
| FrontierMath Tiers 1–3 | 93.7% | 93.7% | 91.2% | 88.8% |
| Furniture Assembly | 80.0% | 80.0% | 83.3% | 75.0% |
| GPQA Diamond | 95.8% | 95.4% | 90.6% | 95.6% |
| GPQA Diamond (OpenRouter run) | 94.7% | 94.4% | 90.2% | 92.9% |
| Mystery Game Puzzles | 84.0% | 80.0% | 71.0% | 65.0% |
| OTIS Mock AIME 2024–2025 | 100.0% | 100.0% | 100.0% | 100.0% |
| SimpleQA Verified | 75.6% | 73.9% | 72.2% | 46.5% |
| τ²-bench Airline (OpenRouter run) | 67.7% | 68.2% | 75.6% | 77.5% |
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); 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..