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	o3 OpenAI	Qwen3.7-Max Alibaba	DeepSeek-V3.1 DeepSeek	GPT-5.5 OpenAI
Vendor	OpenAI	Alibaba	DeepSeek	OpenAI
Family	o-series	Qwen	DeepSeek	GPT
Release date	2025-04-16	2026-05-20	2025-08-21	2026-04-23
Context window	200,000 tokens	1,000,000 tokens	128,000 tokens	400,000 tokens
Parameters	—	—	671B	—
Modality	text, vision	text	text	text, vision, audio
License	proprietary	proprietary	MIT	proprietary
Source	proprietary	proprietary	open weights	proprietary
Description	Reasoning-focused model in the o-series.	Alibaba's flagship agent model — 1M-token context, extended-thinking mode, 56.6 on the Artificial Analysis Intelligence Index v4.0 (5th overall, #1 Chinese). 50.8% on Terminal-Bench Hard. Designed for long-horizon agent workloads (hundreds-to-thousands of steps). Closed-weight, $2.50/$7.50 per 1M tokens.	Large MoE open-weight model. Predecessor to DeepSeek-V4.	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		vendor →	weights →	vendor →
Benchmarks
MMLU-Pro	—	83.7%	—	87.6%
GPQA-D	87.7%	83.0%	—	89.4%
HumanEval	—	93.9%	—	96.8%
Aider	—	78.4%	—	89.7%
AIME-25	88.9%	90.4%	—	94.2%
LiveCB	—	71.0%	—	78.9%
MMMU	—	—	—	78.4%