Grok 4.6 | Epoch AI

ECI#17

156

xAI

Aug. 12, 2026

Closed weights

Grok 4.6 is a closed-weights model from xAI, released August 12, 2026. It has an ECI score of 156 and ranks 17th of 249 tracked models. At the time of its release, it ranked 13th of 241 tracked models.

Grok 4.6 vs select alternatives

Domain	Benchmark	Grok 4.6 xAI Aug. 12, 2026 Closed weights	Grok 4.5 xAI Jul. 8, 2026 Closed weights	GPT-5.6 Luna OpenAI Jul. 9, 2026 Closed weights	Claude Sonnet 5 Anthropic Jun. 30, 2026 Closed weights
	ECI scoreBest score 166	156	154	156	156
	Ranking	#17	#32	#19	#20
Conceptual reasoning	ARC-AGI-2Best score 95%	67%	53%	60%	n/a
	ARC-AGI-1Best score 99%	88%	87%	88%	n/a
Games	Chess PuzzlesBest score 72%	40%	36%	40%	35%
	Mystery Game PuzzlesBest score 84%	34%	n/a	21%	35%
Mathematics	FrontierMath Tiers 1-3 (v2)Best score 94%	66%	57%	82%	66%
	FrontierMath Tier 4 (v2)Best score 98%	32%	24%	61%	29%
	OTIS Mock AIME 2024-2025Best score 100%	99%	98%	98%	95%
Science	GPQA DiamondBest score 96%	94%	93%	92%	91%
World knowledge	SimpleQA VerifiedBest score 76%	49%	48%	41%	34%

Model metadata

General
Organization	xAI
Release date	Aug. 12, 2026
Model accessibility	Closed weights
Country	United States of America
Knowledge cutoff	Unknown
Provider notes	Introducing Grok 4.6

Pricing
Input price	$2 / 1M tokens
Output price	$6 / 1M tokens

Training
Parameters	1.5e12
Training compute	Unknown
Training hardware	Unknown
Training time	Unknown
Training dataset size	Unknown