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	GPT-5.5 OpenAI	DeepSeek-V4-Pro DeepSeek	DeepSeek-V3.1 DeepSeek	Llama 4 Maverick Meta
Vendor	OpenAI	DeepSeek	DeepSeek	Meta
Family	GPT	DeepSeek	DeepSeek	Llama
Release date	2026-04-23	2026-04-22	2025-08-21	2025-04-05
Context window	400,000 tokens	1,000,000 tokens	128,000 tokens	1,000,000 tokens
Parameters	—	1.6T (49B active)	671B	400B
Modality	text, vision, audio	text	text	text, vision
License	proprietary	MIT	MIT	Llama 4 Community License
Source	proprietary	open weights	open weights	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.	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.	Large MoE open-weight model. Predecessor to DeepSeek-V4.	Mixture-of-experts open-weight model from Meta.
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