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	Grok 4 xAI	Gemini Omni Google	Llama 4 Maverick Meta	GPT-5 OpenAI
Vendor	xAI	Google	Meta	OpenAI
Family	Grok	Gemini	Llama	GPT
Release date	2025-07-09	2026-05-20	2025-04-05	2025-08-07
Context window	256,000 tokens	1,000,000 tokens	1,000,000 tokens	400,000 tokens
Parameters	—	—	400B	—
Modality	text	text, vision, audio, video	text, vision	text, vision, audio
License	proprietary	proprietary	Llama 4 Community License	proprietary
Source	proprietary	proprietary	open weights	proprietary
Description	—	Multimodal Gemini variant introduced at Google I/O 2026 — unified text, image, audio, and video processing in a single model.	Mixture-of-experts open-weight model from Meta.	OpenAI's flagship general-purpose model. Superseded by GPT-5.5 in April 2026.
Links	vendor →	vendor →	weights →	vendor →
Benchmarks
MMLU-Pro	82.8%	—	80.5%	85.1%
GPQA-D	87.5%	—	—	87.3%
HumanEval	—	—	—	95.2%
Aider	72.5%	—	—	85.4%
AIME-25	86.1%	—	—	91.0%
LiveCB	65.3%	—	—	74.5%
MMMU	—	82.5%	68.5%	74.1%