Grok 4 vs o3

Direct spec comparison of Grok 4 (from xAI) and o3 (from OpenAI). Want a 3- or 4-way comparison? Open the multi-model tool →

	Grok 4 xAI	o3 OpenAI
Vendor	xAI	OpenAI
Family	Grok	o-series
Release date	2025-07-09	2025-04-16
Context window	256,000 tokens	200,000 tokens
Parameters	—	—
Modality	text	text, vision
License	proprietary	proprietary
Source	proprietary	proprietary
Description	—	Reasoning-focused model in the o-series.
Links	vendor →

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