Predibase

Predibase is a platform for customizing open-source models and deploying them. Its approach uses LoRA adapters served on shared infrastructure, so many fine-tuned variants can run affordably. It was acquired by Rubrik.

You upload data, pick a base model, train, then call the result through an API. Reinforcement fine-tuning is available for tasks with checkable answers.

It suits teams that find general models too costly or imprecise for a narrow task.