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	GPT-5.5 OpenAI	Claude 4.6 Sonnet Anthropic	Gemini Omni Google	DeepSeek-V4-Flash DeepSeek
Vendor	OpenAI	Anthropic	Google	DeepSeek
Family	GPT	Claude	Gemini	DeepSeek
Release date	2026-04-23	2026-02-17	2026-05-20	2026-04-22
Context window	400,000 tokens	1,000,000 tokens	1,000,000 tokens	1,000,000 tokens
Parameters	—	—	—	284B (13B active)
Modality	text, vision, audio	text, vision	text, vision, audio, video	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 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.	Multimodal Gemini variant introduced at Google I/O 2026 — unified text, image, audio, and video processing in a single model.	Smaller, faster sibling to DeepSeek-V4-Pro. Same 1M context window with a much lighter 284B / 13B-active MoE.
Links	vendor →		vendor →	weights →
Benchmarks
MMLU-Pro	87.6%	85.4%	—	—
GPQA-D	89.4%	85.8%	—	—
HumanEval	96.8%	95.9%	—	—
Aider	89.7%	83.6%	—	—
AIME-25	94.2%	87.4%	—	—
LiveCB	78.9%	73.8%	—	—
MMMU	78.4%	—	82.5%	—