Epoch Capabilities Index
An index that fits model capability and benchmark difficulty from scores on over 50 benchmarks in Epoch AI's hub, using item response theory. Scores read like Elo ratings.
Each model needs at least four benchmark scores. Epoch also offers math, software engineering and cyber presets. The November 2026 export lists 271 models.
- Made by
- Epoch AI
- Released
- October 2025
- Kind
- Composite indices
- Level
- Research frontier
- Scored
- Checked automatically
- Answers
- Short answer
- Tasks
- All public
No scores here yet
We have no scores for Epoch Capabilities Index yet.
No lab model card reports it yet
We read the headline results of 522 launch posts from 52 labs, and none of them list this benchmark.
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- MTEB Fading Massive Text Embedding Benchmark: retrieval, clustering, classification across languages and modalities.
sonar 42% - Anthropic ECI (AECI) Only in system cards Index that combines a basket of capability benchmarks into one capability score to track trends across Anthropic models. Claude Opus 5.5 169.4
- SPEED-Bench Only in system cards Measures speculative decoding across varied prompts and domains. Reports the average acceptance length of draft tokens, so higher means faster generation at the same output.
Nemotron 3 Ultra 5.15