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	Gemini 3.5 Google	Grok 4 xAI	GPT-5.5 OpenAI	Llama 4 Maverick Meta
Vendor	Google	xAI	OpenAI	Meta
Family	Gemini	Grok	GPT	Llama
Release date	2026-05-20	2025-07-09	2026-04-23	2025-04-05
Context window	2,000,000 tokens	256,000 tokens	400,000 tokens	1,000,000 tokens
Parameters	—	—	—	400B
Modality	text, vision, audio, video	text	text, vision, audio	text, vision
License	proprietary	proprietary	proprietary	Llama 4 Community License
Source	proprietary	proprietary	proprietary	open weights
Description	Google DeepMind's next-gen Gemini — positioned as "frontier intelligence with action". Built for complex agentic workflows. Announced at Google I/O 2026.	—	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.	Mixture-of-experts open-weight model from Meta.
Links	vendor →	vendor →	vendor →	weights →
Benchmarks
MMLU-Pro	88.9%	82.8%	87.6%	80.5%
GPQA-D	91.2%	87.5%	89.4%	—
HumanEval	—	—	96.8%	—
Aider	—	72.5%	89.7%	—
AIME-25	96.1%	86.1%	94.2%	—
LiveCB	—	65.3%	78.9%	—
MMMU	86.0%	—	78.4%	68.5%