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	Gemini 3 Pro Google	Claude 4.6 Sonnet Anthropic	o3 OpenAI	GPT-5.5 OpenAI
Vendor	Google	Anthropic	OpenAI	OpenAI
Family	Gemini	Claude	o-series	GPT
Release date	2026-04-22	2026-02-17	2025-04-16	2026-04-23
Context window	2,000,000 tokens	1,000,000 tokens	200,000 tokens	400,000 tokens
Parameters	—	—	—	—
Modality	text, vision, audio, video	text, vision	text, vision	text, vision, audio
License	proprietary	proprietary	proprietary	proprietary
Source	proprietary	proprietary	proprietary	proprietary
Description	Google DeepMind's flagship multimodal model. Best-in-class for multimodal understanding and agentic / vibe coding workflows. A "Deep Think" reasoning mode is available to AI Ultra subscribers.	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.	Reasoning-focused model in the o-series.	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 →			vendor →
Benchmarks
MMLU-Pro	87.1%	85.4%	—	87.6%
GPQA-D	88.6%	85.8%	87.7%	89.4%
HumanEval	96.5%	95.9%	—	96.8%
Aider	84.8%	83.6%	—	89.7%
AIME-25	92.8%	87.4%	88.9%	94.2%
LiveCB	76.1%	73.8%	—	78.9%
MMMU	84.3%	—	—	78.4%