Model intelligence

15 AI models

Capability (Epoch Capabilities Index and individual benchmarks from Epoch AI), API list prices and context windows (OpenRouter), release dates and open-weight status. Benchmarks are shown individually - never merged into one invented score.

Leads on ECI

GPT-6 Astra

ECI 166.6Epoch AI

Leads on GPQA Diamond

GPT-6 Astra

95.8%Epoch AI

Leads on SWE-bench Verified

Claude Opus 4.7

83.5%Epoch AI

Cheapest in ECI top 10

GPT-5.6 Sol

$2.00/M inputOpenRouter

Longest context

Grok 4.20 Multi-Agent

2M tokensOpenRouter

Best open-weight on ECI

Kimi K3

ECI 157.68Epoch AI

Epoch Capabilities Index by release date

Capability frontier

About ECI ↗

Source: Epoch AI (CC BY 4.0). ECI is Epoch's item-response model over many benchmarks; each model page shows its 90% confidence interval.

Blended $/1M tokens (3:1 input:output) vs ECI

Price vs capability

Only models with both an ECI score and an OpenRouter price. Normalisation: 75% input + 25% output price. Click a point to open the model.

15 models

2 filters:

#	Model	ECI ↑	AA idx	GPQA◆	SWE-v	FrontierMath	AIME	HLE	Terminal	Context	In $/M	Out $/M	Weights	Released
1	Claude Sonnet 4 Anthropic· reasoning	141.7	—	79.2	—	—	71.1	—	—	200K	$3.00	$15.0	Closed	22 May 2025
2	Claude Haiku 4.5 Anthropic· reasoning	142.4	16.9	71.2	—	—	66.7	—	29.8	200K	$1.00	$5.00	Closed	15 Oct 2025
3	Claude Opus 4.1 Anthropic· reasoning	144.1	—	77.3	73.3	12.6	68.9	—	38.0	200K	$15.0	$75.0	Closed	5 Aug 2025
4	Claude Sonnet 4.5 Anthropic· reasoning	146.8	20.7	—	—	—	—	—	—	1M	$3.00	$15.0	Closed	29 Sep 2025
5	Claude Opus 4.5 Anthropic· reasoning	150.1	—	—	—	—	—	—	—	200K	$5.00	$25.0	Closed	24 Nov 2025
6	Claude Sonnet 4.6 Anthropic· reasoning	152.3	30.1	83.3	—	—	75.6	—	—	1M	$3.00	$15.0	Closed	17 Feb 2026
7	Claude Opus 4.6 Anthropic· reasoning	155.4	—	88.4	—	66.0	91.1	34.4	—	1M	$5.00	$25.0	Closed	5 Feb 2026
8	Claude Sonnet 5 Anthropic· reasoning	156.3	38.2	80.3	—	65.6	80.0	—	—	1M	$2.00	$10.0	Closed	30 Jun 2026
9	Claude Opus 4.7 Anthropic· reasoning	156.4	—	86.4	83.5	70.2	86.7	—	—	1M	$5.00	$25.0	Closed	16 Apr 2026
10	Claude Opus 4.8 Anthropic· reasoning	158.3	41.8	91.0	—	80.0	98.3	—	—	1M	$5.00	$25.0	Closed	28 May 2026
11	Claude Opus 5 Anthropic· reasoning	162.7	50.8	93.9	—	85.6	98.9	—	—	1M	$5.00	$25.0	Closed	24 Jul 2026
12	Claude Fable 5 Anthropic· reasoning	163.6	49.6	85.9	—	87.0	100.0	—	—	1M	$10.0	$50.0	Closed	9 Jun 2026
13	Claude Fable 5.1 Anthropic· reasoning	165.0	53.4	—	—	90.2	100.0	—	—	1M	$10.0	$50.0	Closed	1 Sep 2026
14	Claude Opus 5.5 Anthropic· reasoning	—	57.6	—	—	—	—	—	—	1M	$4.00	$20.0	?	22 Sep 2026
15	Claude Sonnet 5.5 Anthropic· reasoning	—	56.0	—	—	—	—	—	—	1M	$2.00	$10.0	?	28 Sep 2026

Showing 15 of 15. Benchmark cells are % (best reported setting). 3.8K benchmark results in total.Export CSV