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	GPT-5.5 OpenAI	Mistral Large 2 Mistral	DeepSeek-V4-Pro DeepSeek	DeepSeek-V4-Flash DeepSeek
Vendor	OpenAI	Mistral	DeepSeek	DeepSeek
Family	GPT	Mistral	DeepSeek	DeepSeek
Release date	2026-04-23	2024-07-24	2026-04-22	2026-04-22
Context window	400,000 tokens	128,000 tokens	1,000,000 tokens	1,000,000 tokens
Parameters	—	123B	1.6T (49B active)	284B (13B active)
Modality	text, vision, audio	text	text	text
License	proprietary	Mistral Research 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.	—	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.	Smaller, faster sibling to DeepSeek-V4-Pro. Same 1M context window with a much lighter 284B / 13B-active MoE.
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