LongCat

LongCat is a model family and AI platform operated under the Beijing Kuxun Interactive Technology Co., Ltd. copyright notice. It is offered through a web chat, an API platform and a mobile app. The homepage currently features LongCat-2.5, described as a natively multimodal model for agent tasks.

What It Is

LongCat is a series of large language models together with the products built around them: LongCat Web for chat, the LongCat API Platform for developers, and a LongCat App with iOS and Android downloads. The site states that LongCat-2.5 supports visual coding, creative design and 3D tasks, and that it handles complex codebases and full-project builds through multi-step reasoning and tool use.

Models and Research

The site's articles describe LongCat-2.5 as a 1.6 trillion-parameter natively multimodal mixture-of-experts model trained with large-scale long-context training and long-horizon reinforcement learning. LongCat-2.0 is described as a 1.6 trillion-parameter MoE language model with 1M context, aimed at coding and agent tasks. Research papers are published on Hugging Face, including work on improving agent robustness by training in noisy environments.

Works Across Agent Harnesses

The homepage states that LongCat is compatible with Claude Code, Codex, Hermes and other agent harnesses, so the models can be used inside existing agent tooling. The site also links related applications: 妙手, described as Meituan's all-scenario AI Agent platform, and NoCode, described as an AI agent app development platform that needs no programming background.