Jan Code 4B: a small code tuned model Overview Jan Code 4B is a code tuned model built on top of Jan v3 4B base instruct. It’s designed to be a practical coding model you can run locally and iterate on quickly—useful for everyday code tasks and as a lightweight “worker” model in agentic workflows. Compared to larger coding models, Jan Code focuses on handling well scoped subtasks reliably while keeping latency and compute requirements small. Intended Use Lightweight coding assistant for generation, editing, refactoring, and debugging A small, fast worker model for agent setups (e.g., as a sub agent that produces patches/tests while a larger model plans) Replace Haiku model in Claude Code setup Quick Start Integration with Jan Apps Jan code is optimized for direct integration with Jan Desktop, select the model in the app to start using it. Local Deployment Using vLLM: Using llama.cpp: Recommended Parameters For optimal performance in agentic and general tasks, we recommend the following inference parameters: 🤝 Community & Support Discussions : Hugging Face Community Jan App : Learn more about the Jan App at jan.ai 📄 Citation
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