LongCat (BYOK)BYOK

LongCat-2.0 is Meituan's open-weight sparse mixture-of-experts language model with 1.6T total and 48B active parameters. It targets coding, repository-level changes, and agentic workflows. It supports streaming, function calling, and structured output.

LongCat-2.5 is Meituan's open-weight natively multimodal agentic model with a 1M-token context window. It is a sparse mixture-of-experts with 1.6T total and about 48B active parameters. It takes text and image input and returns text, for long-horizon agentic and visual coding.