Introducing Clef: our open-source decision models, and new RL fine-tuning platform
While classifier models have been around for some time, Jev introduces a new decision model concept into the world of AI — a model that produces bounded structured outputs cheaply, quickly and consistently that can be added into a workflow when a decision is required.

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Key points
- Over the last few weeks, there has been lots of buzz around decision models such as Typesafe AI’s Jev System One model.
- Today, we’re releasing two Cloudflare-trained decision models, Clef and Clef-flash, hosted on Workers AI.
- How is Clef different from other decision models?
- Although the market is getting increasingly saturated with decision models, Clef has some unique properties that make us excited to release it to the public.
Sources (1)
- [1]Introducing Clef: our open-source decision models, and new RL fine-tuning platformCloudflare Blog: AI · Oct 1, 03:34 PM
While classifier models have been around for some time, Jev introduces a new decision model concept into the world of AI — a model that produces bounded structured outputs cheaply, quickly and consistently that can be added into a workflow when a decision is required.
Over the last few weeks, there has been lots of buzz around decision models such as Typesafe AI’s Jev System One model.
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Before this
- Oct 1, 2026unslothai/unsloth v0.1.902-beta: Command Palette + Desktop UI/UX
- Sep 30, 2026Cloudflare/clef-flash
- Sep 29, 2026Using Jev In Your Agent Harness
- Sep 29, 2026Language Models for Text Classification: From Bag-of-Words to Jev
- Jul 15, 2026huggingface/transformers v5.14.0: Release v5.14.0
- Jun 10, 2026DiffusionGemma: 4x faster text generation