# PyTorch 2.1.1 + CUDA 12.1 — Software interface version compatibility

For PyTorch 2.1.1 + CUDA 12.1, product is PyTorch; software version is 2.1.1; dependency version is 12.1, recorded from its source on 2026-08-05.

- **Product:** PyTorch _(our reading, not quoted from the source)_
- **Version pairing:** PyTorch 2.1.1 + CUDA 12.1 _(our reading, not quoted from the source)_
- **Software version:** 2.1.1
- **Dependency version:** 12.1

## What the source says

> PyTorch 2.1.1 supports CUDA 11.8 and CUDA 12.1

## Source

- https://www.felixsanz.dev/articles/compatibility-between-pytorch-cuda-and-xformers-versions

Last verified: 2026-08-05. Review by: 2026-10-04.
Part of [Software interface version compatibility](https://referencesource.org/software-interface-version-compatibility/).