BTL-3 is a 27 billion parameter open-weight language model developed by BadTheoryLabs and hosted on Hugging Face. It is specifically trained and optimized for agentic coding tasks and structural tool use. The model supports advanced agent workflows that require planning, tool selection, and code generation. It is provided with full model weights for local or hosted inference, making it suitable for developers building autonomous coding agents or complex tool-using systems.
BTL 3 sits in PulseGate's Foundation models & chat category. Lack of capable open-weight models for complex agentic coding and structured tool-calling tasks. BTL 3 is an open-source project aimed at AI developers and researchers. The project is open source (MIT). BTL 3 is available on the web, the command line, and API.
Behind BTL 3 is BadTheoryLabs, and the product first shipped in 2026. The project is developed in the open on GitHub with 10 stars and 4 commits in the last 90 days. Among its 3 catalogued features are Agentic Coding, Tool Use, and Structural Reasoning.
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BTL-3: A 27B open-weight agent model for agentic coding and structural tool use verified by the PulseGate indexer
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