Lightning AI

LitGPT: Lightning AI's multi-LLM pretraining, finetuning, and deployment framework

LitGPT is an open-source Python framework from Lightning AI supporting 20+ high-performance LLMs with recipes for pretraining, finetuning, and large-scale deployment. The repository has accumulated 13,563 GitHub stars with modest daily momentum (+39). It serves as a practitioner-oriented tooling layer for working with open-weights models across the full training and serving lifecycle.