mantisdk is an open-source platform for training and evaluating AI agents, with features for reinforcement learning and observability. It is aimed at AI researchers and developers working on agent-based systems.
In the LLM eval & observability space, mantisdk takes a focused approach. It focuses on providing a platform for training, evaluating, and observing AI agents using reinforcement learning. mantisdk is an open-source project aimed at AI researchers. The project is open source (MIT). The product ships for the web and the command line, and it can be self-hosted.
It is developed by withmetis, and the product first shipped in 2026. Among its 4 catalogued features are agent training, evaluation platform, and observability.
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