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Claude 4.8 Opus×

Grok 4×

GPT-5.5×

	Claude 4.8 Opus Anthropic	Grok 4 xAI	GPT-5.5 OpenAI	o3 OpenAI
Vendor	Anthropic	xAI	OpenAI	OpenAI
Family	Claude	Grok	GPT	o-series
Release date	2026-05-28	2025-07-09	2026-04-23	2025-04-16
Context window	1,000,000 tokens	256,000 tokens	400,000 tokens	200,000 tokens
Parameters	—	—	—	—
Modality	text, vision	text	text, vision, audio	text, vision
License	proprietary	proprietary	proprietary	proprietary
Source	proprietary	proprietary	proprietary	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.	Reasoning-focused model in the o-series.
Links	vendor →	vendor →	vendor →
Benchmarks
MMLU-Pro	—	82.8%	87.6%	—
GPQA-D	—	87.5%	89.4%	87.7%
HumanEval	—	—	96.8%	—
Aider	—	72.5%	89.7%	—
AIME-25	—	86.1%	94.2%	88.9%
LiveCB	—	65.3%	78.9%	—
MMMU	—	—	78.4%	—