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	Gemini 3 Pro Google	Claude 4.8 Opus Anthropic	DeepSeek-R1 DeepSeek	GPT-5.5 OpenAI
Vendor	Google	Anthropic	DeepSeek	OpenAI
Family	Gemini	Claude	DeepSeek	GPT
Release date	2026-04-22	2026-05-28	2025-01-20	2026-04-23
Context window	2,000,000 tokens	1,000,000 tokens	128,000 tokens	400,000 tokens
Parameters	—	—	671B	—
Modality	text, vision, audio, video	text, vision	text	text, vision, audio
License	proprietary	proprietary	MIT	proprietary
Source	proprietary	proprietary	open weights	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 flagship hybrid-reasoning model — Opus 4.8 pushes coding and AI-agent workflows further (agentic coding 69.2% vs 64.3% on 4.7; multidisciplinary reasoning 57.9% vs 54.7%). 1M-token context, $5/$25 per MTok pricing held flat from Opus 4.7. Introduces Dynamic Workflows for Claude Code (research preview). GA on Anthropic API (`claude-opus-4-8`), AWS Bedrock, Google Vertex, Microsoft Foundry, and GitHub Copilot.	Reasoning-focused open-weight 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.
Links	vendor →	vendor →	weights →	vendor →
Benchmarks
MMLU-Pro	87.1%	—	—	87.6%
GPQA-D	88.6%	—	—	89.4%
HumanEval	96.5%	—	—	96.8%
Aider	84.8%	—	—	89.7%
AIME-25	92.8%	—	79.8%	94.2%
LiveCB	76.1%	—	—	78.9%
MMMU	84.3%	—	—	78.4%