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Cloudflare, Inc.· Released Oct 1

Cloudflare Clef

Clef (27B) and Clef-flash (9B) are Cloudflare-trained open-weight (Apache 2.0) multimodal decision models: given a state and typed questions they return bounded structured answers with probabilities in one forward pass, Jev/System One API compatible, hosted on Workers AI with a 64k context. Launched alongside a new RL fine-tuning platform.

clef-evals: calibration-first eval toolkit for ClefOct 1

Entries

tyrchen

@tyrchen · Oct 3

Runs Cloudflare's Clef Flash locally in Rust with Candle, pinned to a specific checkpoint and implementing the hybrid Qwen3.5 backbone.

ynklab

@ynklab · Oct 3

A browser demo that sends only the phase, held-prize flag, a screenshot and recent actions to Clef and applies its discrete choices to a crane-game physics simulation.

Cloudflare Clef: quick answers

What can you build with Cloudflare Clef?
People have published 126 public builds made with Cloudflare Clef. The most common uses are dev tools (31), education (24), research (18), agents (15) and coding (11).
What are the best Cloudflare Clef GitHub repos?
The most-starred open-source Cloudflare Clef projects in the index are Clef-flash running locally on a live webcam feed, ry: an AI router for 404 pages powered by Clef and s1: a voice-first macOS agent.
Are there Cloudflare Clef demo videos?
Yes: 22 videos show Cloudflare Clef in use, each linked to the original post.
Where do people share Cloudflare Clef projects?
Mostly on GitHub, YouTube and Hacker News, from 118 creators between Oct 1 and Oct 8.