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	GPT-5.5 OpenAI	Gemini 3.5 Google	Gemini 3 Pro Google	DeepSeek-V3.1 DeepSeek
Vendor	OpenAI	Google	Google	DeepSeek
Family	GPT	Gemini	Gemini	DeepSeek
Release date	2026-04-23	2026-05-20	2026-04-22	2025-08-21
Context window	400,000 tokens	2,000,000 tokens	2,000,000 tokens	128,000 tokens
Parameters	—	—	—	671B
Modality	text, vision, audio	text, vision, audio, video	text, vision, audio, video	text
License	proprietary	proprietary	proprietary	MIT
Source	proprietary	proprietary	proprietary	open weights
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.	Google DeepMind's flagship multimodal model. Best-in-class for multimodal understanding and agentic / vibe coding workflows. A "Deep Think" reasoning mode is available to AI Ultra subscribers.	Large MoE open-weight model. Predecessor to DeepSeek-V4.
Links	vendor →	vendor →	vendor →	weights →
Benchmarks
MMLU-Pro	87.6%	88.9%	87.1%	—
GPQA-D	89.4%	91.2%	88.6%	—
HumanEval	96.8%	—	96.5%	—
Aider	89.7%	—	84.8%	—
AIME-25	94.2%	96.1%	92.8%	—
LiveCB	78.9%	—	76.1%	—
MMMU	78.4%	86.0%	84.3%	—