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	DeepSeek-V4-Pro DeepSeek	GPT-5.5 OpenAI	Gemini 3 Pro Google	DeepSeek-V3.1 DeepSeek
Vendor	DeepSeek	OpenAI	Google	DeepSeek
Family	DeepSeek	GPT	Gemini	DeepSeek
Release date	2026-04-22	2026-04-23	2026-04-22	2025-08-21
Context window	1,000,000 tokens	400,000 tokens	2,000,000 tokens	128,000 tokens
Parameters	1.6T (49B active)	—	—	671B
Modality	text	text, vision, audio	text, vision, audio, video	text
License	MIT	proprietary	proprietary	MIT
Source	open weights	proprietary	proprietary	open weights
Description	DeepSeek's flagship open-weight MoE. 1.6T parameters with 49B activated, 1M-token context, and a hybrid attention scheme (CSA + HCA) that delivers long-context inference at ~27% of V3.2's FLOPs.	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 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.
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