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	GPT-5.5 OpenAI	DeepSeek-V4-Pro DeepSeek	Gemini 3.5 Google	DeepSeek-R1 DeepSeek
Vendor	OpenAI	DeepSeek	Google	DeepSeek
Family	GPT	DeepSeek	Gemini	DeepSeek
Release date	2026-04-23	2026-04-22	2026-05-20	2025-01-20
Context window	400,000 tokens	1,000,000 tokens	2,000,000 tokens	128,000 tokens
Parameters	—	1.6T (49B active)	—	671B
Modality	text, vision, audio	text	text, vision, audio, video	text
License	proprietary	MIT	proprietary	MIT
Source	proprietary	open weights	proprietary	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.	Google DeepMind's next-gen Gemini — positioned as "frontier intelligence with action". Built for complex agentic workflows. Announced at Google I/O 2026.	Reasoning-focused open-weight model.
Links	vendor →	weights →	vendor →	weights →
Benchmarks
MMLU-Pro	87.6%	84.2%	88.9%	—
GPQA-D	89.4%	82.4%	91.2%	—
HumanEval	96.8%	95.1%	—	—
Aider	89.7%	80.1%	—	—
AIME-25	94.2%	88.6%	96.1%	79.8%
LiveCB	78.9%	72.4%	—	—
MMMU	78.4%	—	86.0%	—