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	GPT-5.5 OpenAI	Llama 4 Maverick Meta	DeepSeek-V4-Flash DeepSeek	DeepSeek-V4-Pro DeepSeek
Vendor	OpenAI	Meta	DeepSeek	DeepSeek
Family	GPT	Llama	DeepSeek	DeepSeek
Release date	2026-04-23	2025-04-05	2026-04-22	2026-04-22
Context window	400,000 tokens	1,000,000 tokens	1,000,000 tokens	1,000,000 tokens
Parameters	—	400B	284B (13B active)	1.6T (49B active)
Modality	text, vision, audio	text, vision	text	text
License	proprietary	Llama 4 Community License	MIT	MIT
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.	Mixture-of-experts open-weight model from Meta.	Smaller, faster sibling to DeepSeek-V4-Pro. Same 1M context window with a much lighter 284B / 13B-active MoE.	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.
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