X—LLM is a Python library designed to streamline the fine-tuning process for large language models. It supports a variety of popular model architectures like LLaMA, Vicuna, Mistral, and Zephyr, and incorporates advanced training techniques such as quantization via bitsandbytes and GPTQ. The framework provides a simplified interface for applying state-of-the-art fine-tuning methods to customize LLMs for specific tasks.