LongCatAI Conversational ChatLongCat is an open-source large language model released by Meituan. It uses a mixture-of-experts architecture with 560 billion parameters, dynamically activating approximately 27 billion parameters at runtime for text understanding, complex reasoning, and conversational tasks. Users can provide long documents or ongoing conversations for the model to process, making it suitable for developers, enterprise users, and artificial intelligence researchers exploring document analysis, coding assistance, mathematical reasoning, and intelligent agent workflows. LongCat supports inputs of up to 128k characters and offers free usage options. Note that actual performance, response speed, and deployment costs still depend on the task type, operating environment, and specific method of use.138.5All tools with this tag are shown.