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	o3 OpenAI	DeepSeek-V4-Pro DeepSeek	Llama 4 Maverick Meta	GPT-5.5 OpenAI
Vendor	OpenAI	DeepSeek	Meta	OpenAI
Family	o-series	DeepSeek	Llama	GPT
Release date	2025-04-16	2026-04-22	2025-04-05	2026-04-23
Context window	200,000 tokens	1,000,000 tokens	1,000,000 tokens	400,000 tokens
Parameters	—	1.6T (49B active)	400B	—
Modality	text, vision	text	text, vision	text, vision, audio
License	proprietary	MIT	Llama 4 Community License	proprietary
Source	proprietary	open weights	open weights	proprietary
Description	Reasoning-focused model in the o-series.	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.	Mixture-of-experts open-weight model from Meta.	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.
Links		weights →	weights →	vendor →
Benchmarks
MMLU-Pro	—	84.2%	80.5%	87.6%
GPQA-D	87.7%	82.4%	—	89.4%
HumanEval	—	95.1%	—	96.8%
Aider	—	80.1%	—	89.7%
AIME-25	88.9%	88.6%	—	94.2%
LiveCB	—	72.4%	—	78.9%
MMMU	—	—	68.5%	78.4%