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	GPT-5.5 OpenAI	Grok 4 xAI	Claude 4.7 Opus Anthropic	DeepSeek-V4-Pro DeepSeek
Vendor	OpenAI	xAI	Anthropic	DeepSeek
Family	GPT	Grok	Claude	DeepSeek
Release date	2026-04-23	2025-07-09	2026-04-16	2026-04-22
Context window	400,000 tokens	256,000 tokens	1,000,000 tokens	1,000,000 tokens
Parameters	—	—	—	1.6T (49B active)
Modality	text, vision, audio	text	text, vision	text
License	proprietary	proprietary	proprietary	MIT
Source	proprietary	proprietary	proprietary	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.	—	Anthropic's previous Opus flagship — superseded by Opus 4.8 on May 28, 2026 (42-day cycle). Optimized for complex reasoning and coding. Improved software engineering, long-running coding tasks, and higher-resolution vision over Claude 4.6.	DeepSeek's flagship open-weight MoE. 1.6T parameters with 49B activated, 1M-token context, and a hybrid attention scheme (CSA + HCA) that delivers long-context inference at ~27% of V3.2's FLOPs.
Links	vendor →	vendor →	vendor →	weights →
Benchmarks
MMLU-Pro	87.6%	82.8%	88.2%	84.2%
GPQA-D	89.4%	87.5%	90.1%	82.4%
HumanEval	96.8%	—	97.4%	95.1%
Aider	89.7%	72.5%	91.2%	80.1%
AIME-25	94.2%	86.1%	93.5%	88.6%
LiveCB	78.9%	65.3%	80.2%	72.4%
MMMU	78.4%	—	79.0%	—