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	GPT-5.5 OpenAI	Claude 4.6 Sonnet Anthropic	Mistral Large 2 Mistral	Grok 4 xAI
Vendor	OpenAI	Anthropic	Mistral	xAI
Family	GPT	Claude	Mistral	Grok
Release date	2026-04-23	2026-02-17	2024-07-24	2025-07-09
Context window	400,000 tokens	1,000,000 tokens	128,000 tokens	256,000 tokens
Parameters	—	—	123B	—
Modality	text, vision, audio	text, vision	text	text
License	proprietary	proprietary	Mistral Research License	proprietary
Source	proprietary	proprietary	open weights	proprietary
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.	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.	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.	—
Links	vendor →		vendor →weights →	vendor →
Benchmarks
MMLU-Pro	87.6%	85.4%	—	82.8%
GPQA-D	89.4%	85.8%	—	87.5%
HumanEval	96.8%	95.9%	89.0%	—
Aider	89.7%	83.6%	—	72.5%
AIME-25	94.2%	87.4%	—	86.1%
LiveCB	78.9%	73.8%	—	65.3%
MMMU	78.4%	—	—	—