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Best AI models for reasoning

The most capable AI models for reasoning and complex problem-solving, ranked by an independent capability index. Anthropic: Claude Opus 5.5 leads the 25 models below. All on one OpenAI-compatible API through Hormouz.

  1. 1Anthropic: Claude Opus 5.5Anthropic · text, imageCapability: 58
  2. 2Anthropic: Claude Opus 5.5 (batch)Anthropic · text, imageCapability: 58
  3. 3Anthropic: Claude Sonnet 5.5Anthropic · text, imageCapability: 56
  4. 4Anthropic: Claude Sonnet 5.5 (batch)Anthropic · text, imageCapability: 56
  5. 5Anthropic: Claude Fable 5.1Anthropic · text, imageCapability: 53
  6. 6Anthropic: Claude Fable 5.1 (batch)Anthropic · text, imageCapability: 53
  7. 7OpenAI: GPT-6 AstraOpenAI · text, imageCapability: 53
  8. 8OpenAI: GPT-6 Astra (batch)OpenAI · text, imageCapability: 53
  9. 9OpenAI: GPT-6.1 SolOpenAI · text, imageCapability: 52
  10. 10OpenAI: GPT-6.1 Sol (batch)OpenAI · text, imageCapability: 52
  11. 11Google: Gemini 2.5 Pro Preview 06-05Google · text, image, audioCapability: 51
  12. 12Anthropic: Claude Opus 5Anthropic · text, imageCapability: 51
  13. 13Anthropic: Claude Opus 5 (batch)Anthropic · text, imageCapability: 51
  14. 14Anthropic: Claude Fable 5Anthropic · text, imageCapability: 50
  15. 15Anthropic: Claude Fable 5 (batch)Anthropic · text, imageCapability: 50
  16. 16Meta: Muse Spark 1.3Meta · text, image, videoCapability: 48
  17. 17OpenAI: GPT-6 SolOpenAI · text, imageCapability: 48
  18. 18OpenAI: GPT-6 Sol (batch)OpenAI · text, imageCapability: 48
  19. 19OpenAI: GPT-5.6 SolOpenAI · text, imageCapability: 47
  20. 20OpenAI: GPT-5.6 Sol (batch)OpenAI · text, imageCapability: 47
  21. 21SpaceXAI: Grok 4.7xAI · text, imageCapability: 46
  22. 22Xiaomi: MiMo-V2.6-ProXiaomi · text, image, video, audioCapability: 46
  23. 23Qwen: Qwen3.8 Max (0902)Qwen · text, image, videoCapability: 45
  24. 24Z.ai: GLM 5.3Z.ai · textCapability: 45
  25. 25Z.ai: GLM 5.3 (batch)Z.ai · textCapability: 45

FAQ

Which AI model is best for reasoning?
Anthropic: Claude Opus 5.5 tops the 25 models ranked here by overall capability. Reasoning-heavy tasks. Analysis, math and planning. Benefit most from the highest-ranked models.
What does the capability score mean?
It is an aggregate 0–100 index built from independent evaluations; a higher score means stronger general reasoning and problem-solving.

Updated 2026-10-13