cuda-bindings 13.1.0 Release notes

Released on Dec 4, 2025

Highlights

  • Add support for new APIs introduced in CUDA 13.1.

  • The cufile.read and cufile.write functions now return the number of bytes read or written (ssize_t) instead of returning None, providing better feedback on I/O operations.

  • Improved performance of cuFile bindings with approximately 60x faster construction and member access for generated low-level classes.

  • Added __cuda_stream__ protocol support to driver.CUStream class, enabling better interoperability with libraries that expect this protocol.

  • Upgraded Cython dependency to version 3.2.

  • Python 3.9 support was dropped (end of life).

Bug fixes

  • Fixed cuStreamBeginCaptureToGraph to allow the dependencyData argument to be optional, matching the underlying CUDA API behavior.

Backward incompatible changes

Additionally, cufile.StatsLevel3.per_gpu_stats no longer returns a singleton that must be manually converted to a Numpy array, instead it returns a cufile.PerGpuStats array which is directly addressable.

Known issues

  • Updating from older versions (v12.6.2.post1 and below) via pip install -U cuda-python might not work. Please do a clean re-installation by uninstalling pip uninstall -y cuda-python followed by installing pip install cuda-python.

  • The graphics APIs in cuda.bindings.runtime are inadvertently disabled in 13.0.2. Users needing these APIs should update to 13.0.3.