# clefdecide.com

> Independent, free online playground for Cloudflare's Clef and Clef-Flash decision models, plus a guide to the Clef API. Not affiliated with Cloudflare.

Clef is a family of multimodal decision models published by Cloudflare on Workers AI. Given a state (text, JSON, images or video) and typed questions (noul = yes/no, choice, score), it returns a probability for every allowed answer. Clef-Flash is the 9B model ($0.09 per million input tokens); Clef is the 27B model ($0.24 per million input tokens). Published benchmarks: Clef leads on most (e.g. CLINC150+OOS 97.4 vs 66.8 macro-F1); Clef-Flash is about 5x faster (median 38.8 ms vs 209.3 ms). Both have a 65,536-token context window and accept up to 64 questions and 4 images per request.

## Pages
- [Try Clef-Flash online](https://clefdecide.com/): browser playground, 3 free runs then $9 for 20 runs shared with the image checker, both models, shows probabilities and the equivalent API request.
- [Clef API guide](https://clefdecide.com/clef-api): endpoint, request fields, question types, response format, limits, pricing, Workers example.
- [Clef question types](https://clefdecide.com/clef-question-types): noul, choice and score explained with real outputs.
- [Clef examples](https://clefdecide.com/clef-examples): 10 decision recipes (routing, urgency, sentiment, spam, intent, moderation, lead scoring, sensitive data, product photos) with real Clef-Flash results.
- [Clef vs Clef-Flash](https://clefdecide.com/clef-vs-clef-flash): size, price and when to use each model.
- [Clef vs LLM-as-a-judge](https://clefdecide.com/clef-vs-llm-judge): when a decision model fits better than a chat model.
- [Clef pricing calculator](https://clefdecide.com/clef-pricing): cost per decision with real token counts.
- [Clef on Ollama](https://clefdecide.com/clef-ollama): run Clef and Clef-Flash locally; which tags work with /v1/systemone (GGUF only, not MLX), differences from Workers AI. Ollama runs them locally only.
- [Product image checker](https://clefdecide.com/product-image-checker): bulk-check product photos against a custom checklist with Clef-Flash.
- [Product photo checklist](https://clefdecide.com/product-photo-checklist): 10 checks before listing a product.
- [中文版](https://clefdecide.com/zh/): Chinese playground, [中文 API 教程](https://clefdecide.com/zh/clef-api), [中文示例](https://clefdecide.com/zh/clef-examples).

## Official sources
- https://developers.cloudflare.com/workers-ai/models/clef-flash/
- https://developers.cloudflare.com/workers-ai/models/clef/