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	Grok 4 xAI	Llama 4 Maverick Meta	Claude 4.6 Sonnet Anthropic	GPT-5.5 OpenAI
Vendor	xAI	Meta	Anthropic	OpenAI
Family	Grok	Llama	Claude	GPT
Release date	2025-07-09	2025-04-05	2026-02-17	2026-04-23
Context window	256,000 tokens	1,000,000 tokens	1,000,000 tokens	400,000 tokens
Parameters	—	400B	—	—
Modality	text	text, vision	text, vision	text, vision, audio
License	proprietary	Llama 4 Community License	proprietary	proprietary
Source	proprietary	open weights	proprietary	proprietary
Description	—	Mixture-of-experts open-weight model from Meta.	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	vendor →	weights →		vendor →
Benchmarks
MMLU-Pro	82.8%	80.5%	85.4%	87.6%
GPQA-D	87.5%	—	85.8%	89.4%
HumanEval	—	—	95.9%	96.8%
Aider	72.5%	—	83.6%	89.7%
AIME-25	86.1%	—	87.4%	94.2%
LiveCB	65.3%	—	73.8%	78.9%
MMMU	—	68.5%	—	78.4%