Cloudflare Clef vs Stable Diffusion comparison

Cloudflare Clef and Stable Diffusion compared side by side in AI.

Cloudflare Clef

An open-source decision model released by Cloudflare in October 2026. Instead of text, it returns only choices and probabilities, and is compatible with the Jev API

What is good

Apache 2.0 open source, so free even on your own servers
Jev API compatible, so it is easy to swap in
Clef supports a 64K context (2x Jev's) and image decisions

What could be better

Decision-only, cannot chat or write
No app for general users

Cloudflare Clef official site

Stable Diffusion

A leading open-source image generation model you can install and run on your own computer

What is good

Free and open source
Install it yourself for unlimited generation
Very many community models

What could be better

Hard to install and use
Needs a good graphics card

Stable Diffusion official site

At a glance

Highlighted rows are where they differ.

Item	Cloudflare ClefVisit site	Stable DiffusionVisit site
Starting price	Check siteNot applicable	FreeNot applicable
Free tier	Free plan available	Free
Korean support	Limited	Average
Main models	Clef (based on Qwen3.8-27B, supports image input) Clef-flash (based on Qwen3.5-9B, low latency)	Stable Diffusion 3.5(Large/Medium/Turbo) Stable Image Ultra/Core(API) SDXL Stable Audio 3.0
Type	AI services	AI services
Category	Open Models, Developer API	Image Generation, Open Models
Company	Cloudflare, United States	Stability AI, United Kingdom
Plans	Weights free (Apache 2.0) Workers AI pay-as-you-go: Clef $0.24 per 1 million input tokens, Clef-flash $0.038 Workers AI free allocation of 10,000 Neurons per day (excess $0.011 per 1,000 Neurons, Workers Paid required) Contact for fine-tuning	Local use free (revenue under $1M) API $0.03 to $0.08 per image Brand Studio $50 Enterprise
Pros	Apache 2.0 open source, so free even on your own servers Jev API compatible, so it is easy to swap in Clef supports a 64K context (2x Jev's) and image decisions Clef-flash has a very cheap input price Can be tried right away with the Workers AI free allocation	Free and open source Install it yourself for unlimited generation Very many community models
Cons	Decision-only, cannot chat or write No app for general users The self-service fine-tuning platform is still in preparation No public Korean performance data	Hard to install and use Needs a good graphics card

Prices and benefits may change. Check the official site before you pay.

Prices converted at 1 USD = ₩1,327.84 (2026-10-20). Original price shown in brackets. Taxes as listed by each provider.

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