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	Grok 4 xAI	GPT-5.5 OpenAI	Gemini 3.5 Google	GPT-5 OpenAI
Vendor	xAI	OpenAI	Google	OpenAI
Family	Grok	GPT	Gemini	GPT
Release date	2025-07-09	2026-04-23	2026-05-20	2025-08-07
Context window	256,000 tokens	400,000 tokens	2,000,000 tokens	400,000 tokens
Parameters	—	—	—	—
Modality	text	text, vision, audio	text, vision, audio, video	text, vision, audio
License	proprietary	proprietary	proprietary	proprietary
Source	proprietary	proprietary	proprietary	proprietary
Description	—	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.	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 flagship general-purpose model. Superseded by GPT-5.5 in April 2026.
Links	vendor →	vendor →	vendor →	vendor →
Benchmarks
MMLU-Pro	82.8%	87.6%	88.9%	85.1%
GPQA-D	87.5%	89.4%	91.2%	87.3%
HumanEval	—	96.8%	—	95.2%
Aider	72.5%	89.7%	—	85.4%
AIME-25	86.1%	94.2%	96.1%	91.0%
LiveCB	65.3%	78.9%	—	74.5%
MMMU	—	78.4%	86.0%	74.1%