Cloudflare

Introducing Clef: our open-source decision models, and new RL fine-tuning platform

Oct 1, 2026Michelle Chen, Alex Reneau, Kevin Flansburg
Introducing Clef: our open-source decision models, and new RL fine-tuning platform
SummaryAI, from the source post

Introduces Clef and Clef-flash, new Cloudflare-trained decision models hosted on Workers AI. These models are Jev-API compatible, open-sourced on Hugging Face, and offer multimodal classification (image and text) with a 64k context window. Benchmarks show competitive accuracy and significantly lower latency compared to existing models like Jev. The training approach leverages Qwen as a base model and employs a specialized two-stage attention routing process for non-autoregressive inference. Also announces a new RL product for fine-tuning these models.

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