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	Gemini 3.5 Flash Google	Gemini Omni Google	GPT-5.5 OpenAI	GPT-5 Pro OpenAI
Vendor	Google	Google	OpenAI	OpenAI
Family	Gemini	Gemini	GPT	GPT
Release date	2026-05-20	2026-05-20	2026-04-23	2025-08-07
Context window	—	1,000,000 tokens	400,000 tokens	400,000 tokens
Parameters	—	—	—	—
Modality	text, vision, audio	text, vision, audio, video	text, vision, audio	text, vision, audio
License	proprietary	proprietary	proprietary	proprietary
Source	proprietary	proprietary	proprietary	proprietary
Description	Fast, low-cost tier of the Gemini 3.5 family announced at Google I/O 2026. June 2026 update added native computer-use capability, moving Flash from generation to agentic task execution.	Multimodal Gemini variant introduced at Google I/O 2026 — unified text, image, audio, and video processing in a single model.	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.	Higher-reasoning variant of GPT-5, used for harder scientific and research tasks (e.g., immunology breakthroughs at NIH). Same 400K context as GPT-5; trades latency for depth.
Links	vendor →	vendor →	vendor →	vendor →
Benchmarks
MMLU-Pro	—	—	87.6%	—
GPQA-D	—	—	89.4%	—
HumanEval	—	—	96.8%	—
Aider	—	—	89.7%	—
AIME-25	—	—	94.2%	—
LiveCB	—	—	78.9%	—
MMMU	—	82.5%	78.4%	—