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Version 1 demo still available here : demo

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The Stable Diffusion 2.1 demo from Stability AI, kept online for comparison: a 768×768 text-to-image model with a different text encoder than 1.5, stricter on artist names and more literal with prompts. Free, no account. Try the same prompt here and on the SD 1.5 and SDXL demos to see how the models differ.

How to use Stable Diffusion 2.1

  1. Write a descriptive prompt; 2.1 responds less to artist names than 1.5, so describe the style in words.
  2. Add a negative prompt: 2.1 benefits from it more than any other version.
  3. Click Generate and wait for the queue.
  4. Compare with SD 1.5 and SDXL before choosing a model for your project.

Limits and questions

Why is SD 2.1 less popular than 1.5?

Its training removed most artist names and adult content, which changed how prompts behave, and the community kept building on 1.5. It still produces good 768 px landscapes and photos.

Is it still worth using?

For comparison and for prompts that rely on descriptions rather than artist names, yes. For most work SDXL or SD 3.5 are better choices today.

Why is the demo unavailable?

This demo is hosted by a third party (Hugging Face Space) and embedded here; it can be slow, queued or temporarily unavailable when the host is busy. Nothing to install, no account needed.

Read the guide: Which Stable Diffusion model to use