Cloudflare releases Clef decision models on Workers AI

Cloudflare introduced Clef and Clef-flash on October 1, 2026, calling them the first models trained by its Workers AI team and making both available on Workers AI. Instead of generating text, the models take an input state and typed questions, then return probabilities for allowed answers. Developers can use the System One API and ask up to 64 questions per request, including yes-or-no, choice, and rubric-scoring questions. Cloudflare says the weights are available on Hugging Face under the Apache 2.0 license. It is also launching a reinforcement-learning fine-tuning service to help customers adapt Clef to their workloads. The company highlights support-ticket routing, website classification, policy scoring, and agent action checks as possible uses for decision models.