Epoch Capabilities Index
A composite capability index from Epoch AI that statistically stitches together scores from 40+ benchmarks (using an Item-Response-Theory-style model) into a single saturation-resistant general-capability scale, calibrated so Claude 3.5 Sonnet=130 and GPT-5=150.
What this benchmark measures
A composite capability index from Epoch AI that statistically stitches together scores from 40+ benchmarks (using an Item-Response-Theory-style model) into a single saturation-resistant general-capability scale, calibrated so Claude 3.5 Sonnet=130 and GPT-5=150.
Rows on this page are sourced from public benchmark artifacts, leaderboard exports, or source-linked model reports. Each row keeps benchmark version, source model name, and available run details attached to the score.
The metric shown here is Index. It should be interpreted within Epoch Capabilities Index, not compared as part of a site-wide ranking.