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	GPT-5.5 OpenAI	Gemini Omni Google	Mistral Large 2 Mistral	DeepSeek-V3.1 DeepSeek
Vendor	OpenAI	Google	Mistral	DeepSeek
Family	GPT	Gemini	Mistral	DeepSeek
Release date	2026-04-23	2026-05-20	2024-07-24	2025-08-21
Context window	400,000 tokens	1,000,000 tokens	128,000 tokens	128,000 tokens
Parameters	—	—	123B	671B
Modality	text, vision, audio	text, vision, audio, video	text	text
License	proprietary	proprietary	Mistral Research License	MIT
Source	proprietary	proprietary	open weights	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.	Multimodal Gemini variant introduced at Google I/O 2026 — unified text, image, audio, and video processing in a single model.	Large text-only Mistral model with a 128K context window and 123B parameters, tuned for strong instruction following and long-context reasoning. Mistral's flagship open-weights release in the Large 2 line.	Large MoE open-weight model. Predecessor to DeepSeek-V4.
Links	vendor →	vendor →	vendor →weights →	weights →
Benchmarks
MMLU-Pro	87.6%	—	—	—
GPQA-D	89.4%	—	—	—
HumanEval	96.8%	—	89.0%	—
Aider	89.7%	—	—	—
AIME-25	94.2%	—	—	—
LiveCB	78.9%	—	—	—
MMMU	78.4%	82.5%	—	—