Overview
LongCat-2.0: 1.6T-parameter Mixture-of-Experts architecture
LongCat-2.0 is Meituan's open-source, trillion-parameter coding model, released under a fully permissive MIT license after two months spent anonymously topping OpenRouter's developer charts under the codename "Owl Alpha." Built as a 1.6T-parameter Mixture-of-Experts system with only ~48B parameters active per token, it delivers near-frontier agentic coding performance at a fraction of typical inference cost.
The model natively handles a 1-million-token context window, letting it map entire codebases, execute repository-level edits, and generate pull requests in a single session. It integrates directly with harnesses like Claude Code, OpenClaw, and Hermes, and was trained entirely on a cluster of domestic Chinese ASICs rather than Nvidia GPUs.