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Grok 4×

Claude 4.8 Opus×

Claude 4.6 Sonnet×

	Grok 4 xAI	Claude 4.8 Opus Anthropic	Claude 4.6 Sonnet Anthropic	o3 OpenAI
Vendor	xAI	Anthropic	Anthropic	OpenAI
Family	Grok	Claude	Claude	o-series
Release date	2025-07-09	2026-05-28	2026-02-17	2025-04-16
Context window	256,000 tokens	1,000,000 tokens	1,000,000 tokens	200,000 tokens
Parameters	—	—	—	—
Modality	text	text, vision	text, vision	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	82.8%	—	85.4%	—
GPQA-D	87.5%	—	85.8%	87.7%
HumanEval	—	—	95.9%	—
Aider	72.5%	—	83.6%	—
AIME-25	86.1%	—	87.4%	88.9%
LiveCB	65.3%	—	73.8%	—