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	DeepSeek-R1 DeepSeek	Mistral Large 2 Mistral	Claude 4.6 Sonnet Anthropic	GPT-5.5 OpenAI
Vendor	DeepSeek	Mistral	Anthropic	OpenAI
Family	DeepSeek	Mistral	Claude	GPT
Release date	2025-01-20	2024-07-24	2026-02-17	2026-04-23
Context window	128,000 tokens	128,000 tokens	1,000,000 tokens	400,000 tokens
Parameters	671B	123B	—	—
Modality	text	text	text, vision	text, vision, audio
License	MIT	Mistral Research License	proprietary	proprietary
Source	open weights	open weights	proprietary	proprietary
Description	Reasoning-focused open-weight 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.	Anthropic's mid-tier flagship — released 12 days after Opus 4.6 and matching most of its capabilities at ~40% the API cost ($3/$15 per 1M tokens). 1M-token context.	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 →	vendor →weights →		vendor →
Benchmarks
MMLU-Pro	—	—	85.4%	87.6%
GPQA-D	—	—	85.8%	89.4%
HumanEval	—	89.0%	95.9%	96.8%
Aider	—	—	83.6%	89.7%
AIME-25	79.8%	—	87.4%	94.2%
LiveCB	—	—	73.8%	78.9%
MMMU	—	—	—	78.4%