SageAttention 3 support

[Heather95]

Proposal

SageAttention 3 requires Python 3.13 to install, but at the moment Stability Matrix only supports up to Python 3.12.

If there are any workaround methods to install sageattn3, please let me know.

Project page: https://github.com/thu-ml/SageAttention/tree/main/sageattention3_blackwell

[mohnjiles]

Hi, you can enable "Show Unsupported Python Versions" in the Settings page, and then 3.13 should be available as an option when installing a new package.

[wowgiansd-cloud]

Can anyone compile sageattn3 for python 3.13 pytorch 2.9.0cu13?

[Heather95]

Hi, you can enable "Show Unsupported Python Versions" in the Settings page, and then 3.13 should be available as an option when installing a new package.

Thank you! You helped me on Discord earlier, but I forgot to close this issue.

Can anyone compile sageattn3 for python 3.13 pytorch 2.9.0cu13?

Do you have Windows or Linux? Sage Attention 3 isn't working for Windows right now.

I set up WSL on my Windows PC to launch ComfyUI and sageattn3 is working with py313 torch 2.9.1cu128. I also had to add a memory= line to .wslconfig to ensure Comfy would use all of my system RAM.