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	GPT-5.5 OpenAI	Claude 4.8 Opus Anthropic	Gemini 3 Pro Google	Grok 4 xAI
Vendor	OpenAI	Anthropic	Google	xAI
Family	GPT	Claude	Gemini	Grok
Release date	2026-04-23	2026-05-28	2026-04-22	2025-07-09
Context window	400,000 tokens	1,000,000 tokens	2,000,000 tokens	256,000 tokens
Parameters	—	—	—	—
Modality	text, vision, audio	text, vision	text, vision, audio, video	text
License	proprietary	proprietary	proprietary	proprietary
Source	proprietary	proprietary	proprietary	proprietary
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 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.	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.	—
Links	vendor →	vendor →	vendor →	vendor →
Benchmarks
MMLU-Pro	87.6%	—	87.1%	82.8%
GPQA-D	89.4%	—	88.6%	87.5%
HumanEval	96.8%	—	96.5%	—
Aider	89.7%	—	84.8%	72.5%
AIME-25	94.2%	—	92.8%	86.1%
LiveCB	78.9%	—	76.1%	65.3%
MMMU	78.4%	—	84.3%	—