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	Mistral Large 2 Mistral	DeepSeek-R1 DeepSeek	Claude 4.8 Opus Anthropic	GPT-5.5 OpenAI
Vendor	Mistral	DeepSeek	Anthropic	OpenAI
Family	Mistral	DeepSeek	Claude	GPT
Release date	2024-07-24	2025-01-20	2026-05-28	2026-04-23
Context window	128,000 tokens	128,000 tokens	1,000,000 tokens	400,000 tokens
Parameters	123B	671B	—	—
Modality	text	text	text, vision	text, vision, audio
License	Mistral Research License	MIT	proprietary	proprietary
Source	open weights	open weights	proprietary	proprietary
Description	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.	Reasoning-focused open-weight model.	Anthropic's flagship hybrid-reasoning model — Opus 4.8 pushes coding and AI-agent workflows further (agentic coding 69.2% vs 64.3% on 4.7; multidisciplinary reasoning 57.9% vs 54.7%). 1M-token context, $5/$25 per MTok pricing held flat from Opus 4.7. Introduces Dynamic Workflows for Claude Code (research preview). GA on Anthropic API (`claude-opus-4-8`), AWS Bedrock, Google Vertex, Microsoft Foundry, and GitHub Copilot.	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 →	weights →	vendor →	vendor →
Benchmarks
MMLU-Pro	—	—	—	87.6%
GPQA-D	—	—	—	89.4%
HumanEval	89.0%	—	—	96.8%
Aider	—	—	—	89.7%
AIME-25	—	79.8%	—	94.2%
LiveCB	—	—	—	78.9%
MMMU	—	—	—	78.4%