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Boards/Reasoning

Epoch Capabilities Index

One capability score stitched together from dozens of benchmarks with item response theory.
Epoch AI
GPT-6 Astra
#1 right now
166.6
ECI
100
Models ranked
Sep 24, 2026
Board published

Ranking

Best variant per model, as published. Higher is better.

  1. 1
    GPT-6 Astra
    166.6
  2. 2
    Claude Fable 5.1
    165.0
  3. 3
    Claude Fable 5
    163.6
  4. 4
    Claude Opus 5
    162.7
  5. 5
    GPT-5.5 Pro
    162.4
  6. 6
    GPT-5.6 Sol
    162.0
  7. 7
    GPT-5.6 Terra
    159.3
  8. 8
    GPT-5.5
    159.3
  9. 9
    GPT-5.4 Pro
    159.1
  10. 10
    Claude Opus 4.8
    158.3
  11. 11
    Gemini 3.7 Flash
    157.7
  12. 12
    Kimi K3
    157.7
  13. 13
    Gemini 3.8 Flash
    157.1
  14. 14
    GPT-5.4
    156.9
  15. 15
    Muse Spark 1.3
    156.9
  16. 16
    GPT-5.3 Codex
    156.8
  17. 17
    Qwen 3.8 Max
    156.7
  18. 18
    Grok 4.6
    156.5
  19. 19
    Claude Opus 4.7
    156.4
  20. 20
    Claude Sonnet 5
    156.3
  21. 21
    GPT-5.6 Luna
    156.3
  22. 22
    GLM-5.3
    155.6
  23. 23
    GPT-5.2 Pro
    155.4
  24. 24
    DeepSeek V4 Pro 0813
    155.4
  25. 25
    Claude Opus 4.6
    155.4

Rank over time

History builds with every daily capture. One capture so far.

Other reasoning boards

AA Intelligence
#1 Claude Opus 5.5
HLE
#1 GPT-6 Astra
GPQA Diamond
#1 GPT-6 Astra
ARC-AGI-2
#1 GPT-6 Astra
LiveBench
#1 Claude Fable 5.1
MMLU-Pro
#1 Gemini 3.1 Pro Preview
Open LLM LB
#1 none

Scores as published by Epoch AI on the capture date (2026-09-24). Source: epoch.ai eci_scores.csv (CC BY).

epoch.ai/benchmarks/eci

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