Cloudflare introduced two new decision models, Clef and Clef-flash, on Oct. 1, saying the pair is available on Workers AI and also open-sourced on Hugging Face under an Apache 2.0 license for local use and experimentation, according to the company’s announcement and a company post on X (Cloudflare blog, Rita Kozlov on X).
Cloudflare also says Clef is currently the leader on the Jev Decision Index. The leaderboard Cloudflare linked shows Clef in first place with a score of 61.21 and Clef-flash in fifth at 57.07 (leaderboard). The same page also says those Clef and Clef-flash results are self-reported and “have not been reproduced by the upstream board” (leaderboard methodology).
What Cloudflare released
Cloudflare says both models are open-sourced on Hugging Face under Apache 2.0 for local use and experimentation (Cloudflare blog). The publicly listed Hugging Face model card for Cloudflare/clef identifies it as a Cloudflare model, lists Qwen/Qwen3.8-27B as its base model, and shows the repository was last modified on Oct. 1.
Cloudflare also says the new models are fully Jev-API compatible, which The Register reported as a drop-in replacement claim from the company (The Register).
Alongside the models, Cloudflare says it is debuting a reinforcement learning product that lets customers fine-tune Clef for their own use cases (Cloudflare blog).
How Cloudflare describes decision models
Cloudflare’s launch post describes decision models as systems that return bounded, structured outputs with probabilities, such as yes-or-no answers, multiple-choice classifications, or rankings inside a workflow (Cloudflare blog).
Cloudflare says Clef can also handle images and video, unlike text-only decision models, as summarized by The Register. The Hugging Face listing also tags the model as image-text-to-text and multimodal (Hugging Face model card).
Cloudflare’s stated use case
Cloudflare’s blog says the company has been testing Clef with its Threat Intelligence team to classify website domains (Cloudflare blog). In that write-up, Cloudflare describes a workflow where the model assigns categories and probabilities to a site.
The launch positions Clef as an open-weight Jev alternative with a hosted option, local availability, and a new fine-tuning product. The main performance claim attached to that launch, though, is still labeled by the linked leaderboard as self-reported rather than reproduced by the upstream board.
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