Cloudflare's open-source 27B multimodal decision model: state plus typed questions in, probabilities for every option out.
Clef model page on HuggingFace
1 / 2Overview
What is Clef?
Cloudflare's open-source decision models
Clef is Cloudflare's family of open-source decision models. Where chat models generate free-form text, a decision model takes a state plus a schema of typed questions and returns decisions: it reads the state as text, JSON, images or video, then returns a probability for every allowed option of every question in a single forward pass - no text generation, no output parsing.
The flagship Clef is a 27B multimodal model post-trained from Qwen3.8-27B (vision encoder included, standard sharded safetensors), released under Apache-2.0 with weights on HuggingFace. A smaller, faster variant called Clef-Flash is also available. The Clef API is fully compatible with Jev and SystemOne, and Cloudflare publishes a Decision Index leaderboard to compare decision models.
Alongside the models, Cloudflare announced a new RL fine-tuning platform so teams can extend Clef's capabilities with reinforcement learning on their own tasks. The announcement was published on the Cloudflare blog on October 1, 2026.
Platforms and languages
Clef Availability
Platforms
Languages
Capabilities
Clef Key Features
Decisions, not text
Give it a state and a schema of typed questions; it returns a probability for every allowed option of every question in a single forward pass - no text generation, no output parsing.
Multimodal state input
Reads the state as text, JSON, images or video, so decisions can be grounded in whatever context you have.
Open weights, Apache-2.0
27B model post-trained from Qwen3.8-27B with vision encoder, released under Apache-2.0 on HuggingFace; Clef-Flash is the smaller, faster variant.
Jev and SystemOne API compatible
Drop-in compatibility with the Jev and SystemOne APIs for decision-model workloads.
RL fine-tuning platform
Cloudflare's new RL fine-tuning platform extends Clef's capabilities with reinforcement learning on your own tasks, plus a Decision Index leaderboard.
Best for
Who uses Clef?
ML engineers and developers building agentic systems
Get reliable, structured decisions with calibrated probabilities instead of parsing free-form model text
Plans and access
Clef Pricing
Free
Common questions
Clef FAQs
What is a decision model?
A model that turns a state and a schema of typed questions into decisions: it reads the state (text, JSON, images, video) and returns a probability for every allowed option of each question in a single forward pass - no free-form text generation and no output parsing.
What is the license?
Apache-2.0. The weights are open and published on HuggingFace (Cloudflare/clef).
How do I use Clef?
Get the weights from HuggingFace (Cloudflare/clef, 27B, BF16 safetensors) or use the Clef API, which is fully compatible with Jev and SystemOne. There is also a smaller, faster Clef-Flash variant.
What is the RL fine-tuning platform?
Cloudflare announced a new RL fine-tuning platform alongside Clef, designed to extend the models' capabilities with reinforcement learning on your own tasks. Details are in the Cloudflare blog announcement.
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