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	o3 OpenAI	Grok 4 xAI	Llama 4 Maverick Meta	GPT-5.5 OpenAI
Vendor	OpenAI	xAI	Meta	OpenAI
Family	o-series	Grok	Llama	GPT
Release date	2025-04-16	2025-07-09	2025-04-05	2026-04-23
Context window	200,000 tokens	256,000 tokens	1,000,000 tokens	400,000 tokens
Parameters	—	—	400B	—
Modality	text, vision	text	text, vision	text, vision, audio
License	proprietary	proprietary	Llama 4 Community License	proprietary
Source	proprietary	proprietary	open weights	proprietary
Description	Reasoning-focused model in the o-series.	—	Mixture-of-experts open-weight model from Meta.	OpenAI's smartest and most intuitive model — successor to GPT-5, with major coding, research, and document workflow gains. GPT-5.5 Pro variant also available for heavier reasoning.
Links		vendor →	weights →	vendor →
Benchmarks
MMLU-Pro	—	82.8%	80.5%	87.6%
GPQA-D	87.7%	87.5%	—	89.4%
HumanEval	—	—	—	96.8%
Aider	—	72.5%	—	89.7%
AIME-25	88.9%	86.1%	—	94.2%
LiveCB	—	65.3%	—	78.9%
MMMU	—	—	68.5%	78.4%