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Claude 4.6 Sonnet×

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	Claude 4.6 Sonnet Anthropic	Claude 4.8 Opus Anthropic	o3 OpenAI	Grok 4 xAI
Vendor	Anthropic	Anthropic	OpenAI	xAI
Family	Claude	Claude	o-series	Grok
Release date	2026-02-17	2026-05-28	2025-04-16	2025-07-09
Context window	1,000,000 tokens	1,000,000 tokens	200,000 tokens	256,000 tokens
Parameters	—	—	—	—
Modality	text, vision	text, vision	text, vision	text
License	proprietary	proprietary	proprietary	proprietary
Source	proprietary	proprietary	proprietary	proprietary
Description	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.	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.	Reasoning-focused model in the o-series.	—
Links		vendor →		vendor →
Benchmarks
MMLU-Pro	85.4%	—	—	82.8%
GPQA-D	85.8%	—	87.7%	87.5%
HumanEval	95.9%	—	—	—
Aider	83.6%	—	—	72.5%
AIME-25	87.4%	—	88.9%	86.1%
LiveCB	73.8%	—	—	65.3%