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Claude 4.8 Opus×

GPT-5.5×

Claude 4.6 Sonnet×

	Claude 4.8 Opus Anthropic	GPT-5.5 OpenAI	Claude 4.6 Sonnet Anthropic	o3 OpenAI
Vendor	Anthropic	OpenAI	Anthropic	OpenAI
Family	Claude	GPT	Claude	o-series
Release date	2026-05-28	2026-04-23	2026-02-17	2025-04-16
Context window	1,000,000 tokens	400,000 tokens	1,000,000 tokens	200,000 tokens
Parameters	—	—	—	—
Modality	text, vision	text, vision, audio	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.	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 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	—	87.6%	85.4%	—
GPQA-D	—	89.4%	85.8%	87.7%
HumanEval	—	96.8%	95.9%	—
Aider	—	89.7%	83.6%	—
AIME-25	—	94.2%	87.4%	88.9%
LiveCB	—	78.9%	73.8%	—
MMMU	—	78.4%	—	—