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	GPT-5.5 OpenAI	Claude 4.8 Opus Anthropic	o3 OpenAI	Claude 4.7 Opus Anthropic
Vendor	OpenAI	Anthropic	OpenAI	Anthropic
Family	GPT	Claude	o-series	Claude
Release date	2026-04-23	2026-05-28	2025-04-16	2026-04-16
Context window	400,000 tokens	1,000,000 tokens	200,000 tokens	1,000,000 tokens
Parameters	—	—	—	—
Modality	text, vision, audio	text, vision	text, vision	text, vision
License	proprietary	proprietary	proprietary	proprietary
Source	proprietary	proprietary	proprietary	proprietary
Description	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.	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.	Anthropic's previous Opus flagship — superseded by Opus 4.8 on May 28, 2026 (42-day cycle). Optimized for complex reasoning and coding. Improved software engineering, long-running coding tasks, and higher-resolution vision over Claude 4.6.
Links	vendor →	vendor →		vendor →
Benchmarks
MMLU-Pro	87.6%	—	—	88.2%
GPQA-D	89.4%	—	87.7%	90.1%
HumanEval	96.8%	—	—	97.4%
Aider	89.7%	—	—	91.2%
AIME-25	94.2%	—	88.9%	93.5%
LiveCB	78.9%	—	—	80.2%
MMMU	78.4%	—	—	79.0%