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	DeepSeek-R1 DeepSeek	Claude 4.8 Opus Anthropic	GPT-5.5 OpenAI	DeepSeek-V3.1 DeepSeek
Vendor	DeepSeek	Anthropic	OpenAI	DeepSeek
Family	DeepSeek	Claude	GPT	DeepSeek
Release date	2025-01-20	2026-05-28	2026-04-23	2025-08-21
Context window	128,000 tokens	1,000,000 tokens	400,000 tokens	128,000 tokens
Parameters	671B	—	—	671B
Modality	text	text, vision	text, vision, audio	text
License	MIT	proprietary	proprietary	MIT
Source	open weights	proprietary	proprietary	open weights
Description	Reasoning-focused open-weight model.	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.	Large MoE open-weight model. Predecessor to DeepSeek-V4.
Links	weights →	vendor →	vendor →	weights →
Benchmarks
MMLU-Pro	—	—	87.6%	—
GPQA-D	—	—	89.4%	—
HumanEval	—	—	96.8%	—
Aider	—	—	89.7%	—
AIME-25	79.8%	—	94.2%	—
LiveCB	—	—	78.9%	—
MMMU	—	—	78.4%	—