LongCat-2.0 AI Model Outperforms GPT-5.5 and Claude Sonnet 5

The 1.6 trillion-parameter AI model known as LongCat-2.0 was secretly operating for two months under the alias "Owl Alpha" on the OpenRouter platform. This stealth deployment allowed the model to consistently rank at the top of leaderboards without its true identity being revealed. Meituan eventually claimed ownership of the model, bringing its capabilities to light.

LongCat-2.0, a mixture-of-experts architecture, has demonstrated performance that surpasses leading models such as OpenAI's GPT-5.5 and Anthropic's Claude Sonnet 5. Benchmarking data indicates that LongCat-2.0 not only matches but exceeds the performance of these more established models across various tasks.

A significant advantage of LongCat-2.0 is its cost-effectiveness. According to Meituan's claims, the model undercuts GPT-5.5 and Claude Sonnet 5 on price by a substantial margin. This pricing strategy makes advanced AI capabilities more accessible and competitive in the market.

The revelation of LongCat-2.0's performance and pricing challenges the current landscape of large language models. Its ability to achieve top-tier performance while offering a more economical solution suggests a potential shift in AI model development and deployment strategies, emphasizing efficiency alongside power.