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	o3 OpenAI	Grok 4 xAI	Claude 4.8 Opus Anthropic	GPT-5 OpenAI
Vendor	OpenAI	xAI	Anthropic	OpenAI
Family	o-series	Grok	Claude	GPT
Release date	2025-04-16	2025-07-09	2026-05-28	2025-08-07
Context window	200,000 tokens	256,000 tokens	1,000,000 tokens	400,000 tokens
Parameters	—	—	—	—
Modality	text, vision	text	text, vision	text, vision, audio
License	proprietary	proprietary	proprietary	proprietary
Source	proprietary	proprietary	proprietary	proprietary
Description	Reasoning-focused model in the o-series.	—	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 flagship general-purpose model. Superseded by GPT-5.5 in April 2026.
Links		vendor →	vendor →	vendor →
Benchmarks
MMLU-Pro	—	82.8%	—	85.1%
GPQA-D	87.7%	87.5%	—	87.3%
HumanEval	—	—	—	95.2%
Aider	—	72.5%	—	85.4%
AIME-25	88.9%	86.1%	—	91.0%
LiveCB	—	65.3%	—	74.5%
MMMU	—	—	—	74.1%