Cloudflare launches open-source Clef decision models and RL fine-tuning tool

A new set of open-source AI models called Clef and Clef-flash has launched, hosted on Workers AI infrastructure. The models are designed for high-speed classification tasks and for use in agentic workflows, where AI systems take multi-step actions.

Alongside the models, the team introduced a reinforcement learning fine-tuning platform. The platform lets developers train and customize these decision models using their own data, rather than relying solely on pre-trained defaults.

The release targets developers building AI-driven applications that need fast, specialized decision-making rather than general-purpose large language model responses.