Kimi-Dev is a powerful open-source coding LLM designed to tackle issues in software engineering. It is optimized through large-scale reinforcement learning to ensure correctness and robustness in real development environments. Kimi-Dev-72B achieved 60.4% performance on the SWE-bench benchmark, surpassing other open-source models, making it one of the most advanced coding LLMs available today. The model can be downloaded and deployed from Hugging Face and GitHub, making it suitable for use by developers and researchers.