The LongCat team at Meituan introduced the LongCat-2.5 model on November 2nd. This model is a native multimodal system designed to perform long-horizon agent tasks. According to IT Home, the model has a total of 1.6 trillion parameters and activates about 48 billion of them when processing each token.
LongCat-2.5 is based on the previous LongCat-2.0 version and significantly improves two key aspects: native visual data understanding and agent coding capability. The official release followed a preliminary version, LongCat-2.5-Preview, which was available on the LongCat API platform since September 25th.
Improvements in Training and Task Handling
A large part of the training process focused on long-term tasks. Meituan reported adding more long-horizon trajectory data to long sequence training and utilizing large-scale long-horizon reinforcement learning to refine end-to-end engineering work. This includes developing within complex codebases and creating complete projects.
The team continues to expand data synthesis, build environments, and conduct mixed training across various agent mechanisms. Furthermore, they convert failure trajectories of real agents into reproducible and verifiable tasks for training, allowing them to continuously replenish the database in areas where the model shows weaknesses.
Visual Understanding and Infrastructure
In terms of image processing, LongCat-2.5 represents visual signals as multi-level discrete tokens. This allows the core of the model to process images and text in a unified tokenized format. Meituan asserts that combining this native vision with agent coding makes the model strong in visual coding, enabling it to handle creative design and 3D tasks.
The infrastructure supporting the model's release operates on domestic computing power. Meituan optimized long-context training and W4A4 inference, which uses 4-bit weights and 4-bit activations, on internal chips. Work on numerical consistency between training and inference, along with optimizing long-context deployment, ensures the efficient operation of large-scale long-horizon reinforcement learning.
Testing Results and Availability
According to the benchmark table presented by Meituan itself, LongCat-2.5 achieved a score of 88.4 on Terminal Bench v2.1, surpassing LongCat-2.0's 70.8, and 51.8 on AutomationBench compared to 15.8. The model also reached 91.9 on BrowseComp, 82.1 on PaperBench, 55.4 on 3DCodeBench, and 78.6 on Vision2Web. When compared to state-of-the-art models from other labs, LongCat-2.5 does not hold the top spot in all tests; for instance, it scores 25.5 on Program Bench versus 37 by the best competitor. It should be noted that these metrics have not yet undergone independent verification.
The LongCat changelog indicates that the model is compatible with Claude Code, Codex, Hermes, and other major frameworks, and the platform documentation contains guides for configuring tools such as OpenCode, Cline, Kilo Code, CodeBuddy, and WorkBuddy. LongCat-2.5 is available at longcat.chat and via the LongCat API, with Meituan announcing upcoming releases on GitHub and Hugging Face.



