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	Grok 4 xAI	Llama 4 Scout Meta	Gemini 3.5 Google	GPT-5.5 OpenAI
Vendor	xAI	Meta	Google	OpenAI
Family	Grok	Llama	Gemini	GPT
Release date	2025-07-09	2025-04-05	2026-05-20	2026-04-23
Context window	256,000 tokens	10,000,000 tokens	2,000,000 tokens	400,000 tokens
Parameters	—	109B	—	—
Modality	text	text, vision	text, vision, audio, video	text, vision, audio
License	proprietary	Llama 4 Community License	proprietary	proprietary
Source	proprietary	open weights	proprietary	proprietary
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.
Links	vendor →	weights →	vendor →	vendor →
Benchmarks
MMLU-Pro	82.8%	—	88.9%	87.6%
GPQA-D	87.5%	—	91.2%	89.4%
HumanEval	—	—	—	96.8%
Aider	72.5%	—	—	89.7%
AIME-25	86.1%	—	96.1%	94.2%
LiveCB	65.3%	—	—	78.9%
MMMU	—	—	86.0%	78.4%