Epoch AI

Capabilities Index · Independent evaluations

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An independent measure of frontier AI capabilities, presented with the latest published results from Epoch AI.

Higher is better

Models with results

158

Highest score

166.31

Leading model

GPT-6 Astra

Last synced

16 Sept 2026

Source: Epoch AI. Scores and confidence intervals reflect the latest published ECI results.

Index leaderboard

Compare Epoch AI Capabilities Index scores across the current model set.

Capabilities Index

Frontier AI capability · Higher is better

166.31

163.27

162.3

162.25

161.81

159.14

159.12

158.95

158.3

157.63

157.44

156.86

156.58

156.54

Showing 14 of 158 models

Progress

See how the Capabilities Index has moved as new models have been released.

Score Progress

Compare Model Scores by Release Date.

Showing 74 of 131 Results

Pareto Frontier

Model Results

Rank	Model	Score	Released
1	GPT-6 AstraOpenAI	16695% CI 163.00–171.88	03 Sept 2026
2	Claude Fable 5Anthropic	16395% CI 160.54–167.10	09 Jun 2026
3	Claude Opus 5Anthropic	16295% CI 159.90–165.74	24 Jul 2026
4	GPT 5.5 ProOpenAI	16295% CI 159.32–165.76	23 Apr 2026
5	GPT 5.6 SolOpenAI	16295% CI 159.57–165.20	09 Jul 2026
6	GPT 5.6 TerraOpenAI	15995% CI 157.01–161.84	09 Jul 2026
7	GPT 5.5OpenAI	15995% CI 156.91–161.95	23 Apr 2026
8	GPT 5.4 ProOpenAI	15995% CI 156.73–161.70	05 Mar 2026
9	Claude Opus 4.8Anthropic	15895% CI 156.43–160.71	28 May 2026
10	Kimi K3Moonshot	15895% CI 155.38–160.45	16 Jul 2026
11	Gemini 3.7 FlashGoogle	15795% CI 155.66–159.78	13 Aug 2026
12	GPT 5.4OpenAI	15795% CI 155.21–159.00	05 Mar 2026
13	GPT 5.3 CodexOpenAI	15795% CI 153.91–159.73	05 Feb 2026
14	Gemini 3.8 FlashGoogle	15795% CI 154.58–161.97	02 Sept 2026
15	Grok 4.6SpaceXAI	15695% CI 154.77–158.88	12 Aug 2026
16	Claude Opus 4.7Anthropic	15695% CI 154.57–158.50	16 Apr 2026
17	Claude Sonnet 5Anthropic	15695% CI 153.63–158.63	30 Jun 2026
18	Muse Spark 1.2Meta	15595% CI 153.90–158.64	05 Aug 2026
19	DeepSeek V4 Pro 0813DeepSeek	15595% CI 153.78–157.83	13 Aug 2026
20	GPT 5.2 ProOpenAI	15595% CI 153.18–158.22	11 Dec 2025
21	Claude Opus 4.6Anthropic	15595% CI 153.70–157.21	05 Feb 2026
22	GLM 5.3z.AI	15595% CI 153.18–157.53	14 Aug 2026
23	Gemini 3.1 ProGoogle	15595% CI 152.72–157.60	-
24	Gemini 3.5 FlashGoogle	15595% CI 152.78–157.03	19 May 2026
25	Muse Spark 1.1Meta	15595% CI 152.58–157.88	09 Jul 2026