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	GPT-5 Pro OpenAI	DeepSeek-R1 DeepSeek	Gemini 3.5 Flash Google	Gemini 3 Pro Google
Vendor	OpenAI	DeepSeek	Google	Google
Family	GPT	DeepSeek	Gemini	Gemini
Release date	2025-08-07	2025-01-20	2026-05-20	2026-04-22
Context window	400,000 tokens	128,000 tokens	—	2,000,000 tokens
Parameters	—	671B	—	—
Modality	text, vision, audio	text	text, vision, audio	text, vision, audio, video
License	proprietary	MIT	proprietary	proprietary
Source	proprietary	open weights	proprietary	proprietary
Description	Higher-reasoning variant of GPT-5, used for harder scientific and research tasks (e.g., immunology breakthroughs at NIH). Same 400K context as GPT-5; trades latency for depth.	Reasoning-focused open-weight model.	Fast, low-cost tier of the Gemini 3.5 family announced at Google I/O 2026. June 2026 update added native computer-use capability, moving Flash from generation to agentic task execution.	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.
Links	vendor →	weights →	vendor →	vendor →
Benchmarks
MMLU-Pro	—	—	—	87.1%
GPQA-D	—	—	—	88.6%
HumanEval	—	—	—	96.5%
Aider	—	—	—	84.8%
AIME-25	—	79.8%	—	92.8%
LiveCB	—	—	—	76.1%
MMMU	—	—	—	84.3%