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	GPT-5.5 OpenAI	Gemini Omni Google	Claude 4.6 Sonnet Anthropic	DeepSeek-V4-Pro DeepSeek
Vendor	OpenAI	Google	Anthropic	DeepSeek
Family	GPT	Gemini	Claude	DeepSeek
Release date	2026-04-23	2026-05-20	2026-02-17	2026-04-22
Context window	400,000 tokens	1,000,000 tokens	1,000,000 tokens	1,000,000 tokens
Parameters	—	—	—	1.6T (49B active)
Modality	text, vision, audio	text, vision, audio, video	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.	Multimodal Gemini variant introduced at Google I/O 2026 — unified text, image, audio, and video processing in a single model.	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.	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 →		weights →
Benchmarks
MMLU-Pro	87.6%	—	85.4%	84.2%
GPQA-D	89.4%	—	85.8%	82.4%
HumanEval	96.8%	—	95.9%	95.1%
Aider	89.7%	—	83.6%	80.1%
AIME-25	94.2%	—	87.4%	88.6%
LiveCB	78.9%	—	73.8%	72.4%
MMMU	78.4%	82.5%	—	—