LongCat-2.0

LongCat-2.0 is Meituan's open-source flagship, released June 30, 2026 under an MIT license on GitHub and Hugging Face. It is a 1.6 trillion parameter mixture-of-experts model with dynamic activation of 33 to 56 billion parameters per token, purpose-built for agentic coding (code understanding, generation, and execution in real-world agent workflows). Native 1 million token context, pretrained from scratch on more than 30 trillion tokens across Chinese, English, multilingual, and code data. Meituan reports 59.5 on SWE-Bench Pro (self-reported, ahead of Gemini 3.1 Pro, GPT-5.5, and Claude Opus 4.6 by their measure); independent verification is pending. The model is the first trillion-parameter release trained and served entirely on a 50,000-card domestic Chinese compute cluster, a milestone for building frontier AI without leading-edge Western chips. A preview version had quietly been running on OpenRouter and longcat.ai for weeks before the announcement, ranking among the top three models globally by call volume during that stealth window. Meituan now sells API access: the LongCat platform lists LongCat-2.0 at $0.75 per million uncached input tokens, $0.015 cached, and $2.95 output, with a limited-time discount to $0.30, $0.006, and $1.20. No end date is published for the discount, so the list rate is the one to budget.