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	GPT-5.5 OpenAI	Claude 4.8 Opus Anthropic	DeepSeek-V4-Pro DeepSeek	DeepSeek-R1 DeepSeek
Vendor	OpenAI	Anthropic	DeepSeek	DeepSeek
Family	GPT	Claude	DeepSeek	DeepSeek
Release date	2026-04-23	2026-05-28	2026-04-22	2025-01-20
Context window	400,000 tokens	1,000,000 tokens	1,000,000 tokens	128,000 tokens
Parameters	—	—	1.6T (49B active)	671B
Modality	text, vision, audio	text, vision	text	text
License	proprietary	proprietary	MIT	MIT
Source	proprietary	proprietary	open weights	open weights
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.	DeepSeek's flagship open-weight MoE. 1.6T parameters with 49B activated, 1M-token context, and a hybrid attention scheme (CSA + HCA) that delivers long-context inference at ~27% of V3.2's FLOPs.	Reasoning-focused open-weight model.
Links	vendor →	vendor →	weights →	weights →
Benchmarks
MMLU-Pro	87.6%	—	84.2%	—
GPQA-D	89.4%	—	82.4%	—
HumanEval	96.8%	—	95.1%	—
Aider	89.7%	—	80.1%	—
AIME-25	94.2%	—	88.6%	79.8%
LiveCB	78.9%	—	72.4%	—
MMMU	78.4%	—	—	—