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Claude 4.8 Opus×

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	Claude 4.8 Opus Anthropic	GPT-5.5 OpenAI	Llama 4 Maverick Meta	Gemini Omni Google
Vendor	Anthropic	OpenAI	Meta	Google
Family	Claude	GPT	Llama	Gemini
Release date	2026-05-28	2026-04-23	2025-04-05	2026-05-20
Context window	1,000,000 tokens	400,000 tokens	1,000,000 tokens	1,000,000 tokens
Parameters	—	—	400B	—
Modality	text, vision	text, vision, audio	text, vision	text, vision, audio, video
License	proprietary	proprietary	Llama 4 Community License	proprietary
Source	proprietary	proprietary	open weights	proprietary
Description	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.	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.	Mixture-of-experts open-weight model from Meta.	Multimodal Gemini variant introduced at Google I/O 2026 — unified text, image, audio, and video processing in a single model.
Links	vendor →	vendor →	weights →	vendor →
Benchmarks
MMLU-Pro	—	87.6%	80.5%	—
GPQA-D	—	89.4%	—	—
HumanEval	—	96.8%	—	—
Aider	—	89.7%	—	—
AIME-25	—	94.2%	—	—
LiveCB	—	78.9%	—	—
MMMU	—	78.4%	68.5%	82.5%