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	o3 OpenAI	DeepSeek-V4-Flash DeepSeek	Qwen3.6-27B Alibaba	GPT-5.5 OpenAI
Vendor	OpenAI	DeepSeek	Alibaba	OpenAI
Family	o-series	DeepSeek	Qwen	GPT
Release date	2025-04-16	2026-04-22	2026-04-22	2026-04-23
Context window	200,000 tokens	1,000,000 tokens	262,144 tokens	400,000 tokens
Parameters	—	284B (13B active)	27B (dense)	—
Modality	text, vision	text	text, vision, video	text, vision, audio
License	proprietary	MIT	Apache-2.0	proprietary
Source	proprietary	open weights	open weights	proprietary
Description	Reasoning-focused model in the o-series.	Smaller, faster sibling to DeepSeek-V4-Pro. Same 1M context window with a much lighter 284B / 13B-active MoE.	Alibaba's first dense open-weight in the 3.6 family. Strong agentic-coding scores (77.2 SWE-bench Verified, matching Claude 4.5 Opus on Terminal-Bench 2.0). Supports 201 languages and multimodal text/image/video input.	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	—	—	78.9%	87.6%
GPQA-D	87.7%	—	—	89.4%
HumanEval	—	—	91.5%	96.8%
Aider	—	—	70.2%	89.7%
AIME-25	88.9%	—	—	94.2%
LiveCB	—	—	—	78.9%
MMMU	—	—	70.3%	78.4%