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Claude 4.8 Opus×

Claude 4.6 Sonnet×

Grok 4×

	Claude 4.8 Opus Anthropic	Claude 4.6 Sonnet Anthropic	Grok 4 xAI	o3 OpenAI
Vendor	Anthropic	Anthropic	xAI	OpenAI
Family	Claude	Claude	Grok	o-series
Release date	2026-05-28	2026-02-17	2025-07-09	2025-04-16
Context window	1,000,000 tokens	1,000,000 tokens	256,000 tokens	200,000 tokens
Parameters	—	—	—	—
Modality	text, vision	text, vision	text	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.	Anthropic's mid-tier flagship — released 12 days after Opus 4.6 and matching most of its capabilities at ~40% the API cost ($3/$15 per 1M tokens). 1M-token context.	—	Reasoning-focused model in the o-series.
Links	vendor →		vendor →
Benchmarks
MMLU-Pro	—	85.4%	82.8%	—
GPQA-D	—	85.8%	87.5%	87.7%
HumanEval	—	95.9%	—	—
Aider	—	83.6%	72.5%	—
AIME-25	—	87.4%	86.1%	88.9%
LiveCB	—	73.8%	65.3%	—