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	GPT-5.5 OpenAI	Claude 4.8 Opus Anthropic	Grok 4 xAI	Gemini 3.5 Google
Vendor	OpenAI	Anthropic	xAI	Google
Family	GPT	Claude	Grok	Gemini
Release date	2026-04-23	2026-05-28	2025-07-09	2026-05-20
Context window	400,000 tokens	1,000,000 tokens	256,000 tokens	2,000,000 tokens
Parameters	—	—	—	—
Modality	text, vision, audio	text, vision	text	text, vision, audio, video
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 next-gen Gemini — positioned as "frontier intelligence with action". Built for complex agentic workflows. Announced at Google I/O 2026.
Links	vendor →	vendor →	vendor →	vendor →
Benchmarks
MMLU-Pro	87.6%	—	82.8%	88.9%
GPQA-D	89.4%	—	87.5%	91.2%
HumanEval	96.8%	—	—	—
Aider	89.7%	—	72.5%	—
AIME-25	94.2%	—	86.1%	96.1%
LiveCB	78.9%	—	65.3%	—
MMMU	78.4%	—	—	86.0%