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	DeepSeek-V4-Pro DeepSeek	Gemini 3.5 Google	GPT-5.5 OpenAI	DeepSeek-V4-Flash DeepSeek
Vendor	DeepSeek	Google	OpenAI	DeepSeek
Family	DeepSeek	Gemini	GPT	DeepSeek
Release date	2026-04-22	2026-05-20	2026-04-23	2026-04-22
Context window	1,000,000 tokens	2,000,000 tokens	400,000 tokens	1,000,000 tokens
Parameters	1.6T (49B active)	—	—	284B (13B active)
Modality	text	text, vision, audio, video	text, vision, audio	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.	Google DeepMind's next-gen Gemini — positioned as "frontier intelligence with action". Built for complex agentic workflows. Announced at Google I/O 2026.	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.	Smaller, faster sibling to DeepSeek-V4-Pro. Same 1M context window with a much lighter 284B / 13B-active MoE.
Links	weights →	vendor →	vendor →	weights →
Benchmarks
MMLU-Pro	84.2%	88.9%	87.6%	—
GPQA-D	82.4%	91.2%	89.4%	—
HumanEval	95.1%	—	96.8%	—
Aider	80.1%	—	89.7%	—
AIME-25	88.6%	96.1%	94.2%	—
LiveCB	72.4%	—	78.9%	—
MMMU	—	86.0%	78.4%	—