Compatibility Status Tracking#
This page tracks the status of packages for which we're aware of active work on free-threaded support. It contains packages with extension modules, as well as build tools and packages that needed code specifically to support free-threading. Note that pure Python code works without changes by design, hence this page does not aim to track pure Python packages.
We are updating this tracking table manually and including links to nightlies and project-specific issue links. There is also an automatically updated tracker that pulls in information for a wider range of packages, but only tracks whether or not they have wheels on PyPI.
If you are using conda-forge, you can track the packages still waiting to be migrated on the conda forge website.
If there's a bug related to free-threading in a library you use, please open an issue on the corresponding issue tracker or post a comment on the corresponding free-threading support tracking issue (see table below). If an issue spans multiple projects or there's an ecosystem-wide point to discuss, please open an issue on this issue tracker.
| Project | Upstream issue | Tested in CI | PyPI release | First version with support | Nightly wheels | Nightly link |
|---|---|---|---|---|---|---|
| aiohttp | 3.13.0 | |||||
| asv | ||||||
| Bazel (rules-python) | 1 | 0.39.0 | ||||
| argon2-cffi-bindings | 25.1.0 | |||||
| Boost.Python | ||||||
| bcrypt | 4.3.0 | |||||
| bottleneck | 1.5.0 | |||||
| brotli | ||||||
| cffi | 2.0.0 | |||||
| charset-normalizer | ||||||
| cibuildwheel | 2.19 | |||||
| CMake | 3.30.0 | |||||
| conda | 24.11.0 | |||||
| ContourPy | 1.3.0 | |||||
| cramjam | 2.11.0 | |||||
| cryptography | 46.0.0 | |||||
| cupy | ||||||
| cymem | 2.0.13 | |||||
| Cython | 3.1.0 | |||||
| cython-blis | ||||||
| fastrlock | ||||||
| frozenlist | 1.6.0 | |||||
| grpcio | ||||||
| hatch | ||||||
| h5py | ||||||
| hf-xet | 1.2.0 | |||||
| httptools | ||||||
| hypothesis | 6.135.32 | |||||
| JAX | 0.5.1 | |||||
| joblib | 1.4.2 | |||||
| jupyter_client | ||||||
| jupyterlab | ||||||
| kiwisolver | 1.4.8 | |||||
| kornia-rs | 0.1.9 | |||||
| LibCST | 1.8.0 | |||||
| llguidance | ||||||
| llvmlite | ||||||
| lxml | ||||||
| lz4 | 4.4.5 | |||||
| mamba | 2.3.2 | |||||
| markupsafe | 3.0.0 | |||||
| matplotlib | 3.9.0 | |||||
| maturin | 1.7.5 | |||||
| Meson | 1.5.0 | |||||
| meson-python | 0.16.0 | |||||
| ml-dtypes | 0.5.1 | |||||
| mlir-python | 20.1.0 | |||||
| multidict | 6.2.0 | |||||
| msgpack | 1.1.2 2 | |||||
| msgspec | 0.20.0 | |||||
| murmurhash | 1.0.15 | |||||
| mypyc | ||||||
| nanobind | 2.2.0 | |||||
| ndindex | 1.10.0 | |||||
| nox | 2025.10.14 | |||||
| Numba | 0.64.0 | |||||
| Nuitka | ||||||
| numexpr | 2.11.0 | |||||
| NumPy | 2.1.0 | |||||
| nvImageCodec | 0.4.0 | |||||
| ONNX | 1.18.0 | |||||
| OpenCV | ||||||
| openai-harmony | ||||||
| orjson | ||||||
| packaging | 24.0 | |||||
| pandas | 2.2.3 | |||||
| Pillow | 11.0.0 | |||||
| pip | 24.1 | |||||
| Pixi | 0.39.5 | |||||
| polars | ||||||
| preshed | 3.0.12 | |||||
| propcache | 0.3.0 | |||||
| protobuf | ||||||
| psutil | 7.1.2 | |||||
| psycopg | ||||||
| pydantic | 2.11.0 | |||||
| pydantic-core | 2.29.0 | |||||
| PyArrow | 18.0.0 | |||||
| PyAV | 15.1.0 | |||||
| pybind11 | 2.13 | |||||
| pycares | 4.11.0 | |||||
| pycocotools | 2.0.10 | |||||
| pycryptodome | 3.23.0 | |||||
| pygit2 | 1.19.0 | |||||
| PyNaCl | 1.6.0 | |||||
| PyO3 | 3 | 0.23 | ||||
| PyObjC | 11.0 | |||||
| Pythran | 0.18.0 | |||||
| PyTorch | 2.6.0 | |||||
| PyWavelets | 1.7.0 | |||||
| pywinpty | 2.0.15 | |||||
| PyYAML | 6.0.3 | |||||
| PyZMQ | 27.0.0 | |||||
| RapidFuzz | 3.14.3 | |||||
| rpds-py | 0.22.3 | |||||
| ruamel.yaml.clib | ||||||
| rust-numpy | 3 | 0.24.0 | ||||
| safetensors | ||||||
| scikit-build-core | 0.9.5 | |||||
| scikit-image | 0.25.2 | |||||
| scikit-learn | 1.6.0 | |||||
| SciPy | 1.15.0 | |||||
| sentencepiece | 0.2.1 | |||||
| setproctitle | 1.3.6 | |||||
| setuptools | 69.5.0 | |||||
| setuptools-rust | 1.11.0 | |||||
| Shapely | 2.1.0 | |||||
| spacy | ||||||
| sqlalchemy | ||||||
| srsly | ||||||
| SWIG | 4 | 4.4.0 | ||||
| thrift | ||||||
| tiktoken | 0.12.0 | |||||
| tokenizers | ||||||
| tornado | ||||||
| tox | 4.26.0 | |||||
| uv | 0.4.24 | |||||
| ultrajson | ||||||
| vLLM | ||||||
| wrapt | 1.17.0 | |||||
| xformers | ||||||
| xxhash | 3.6.0 | |||||
| yappi | ||||||
| yarl | 1.20.0 | |||||
| zstandard5 | 0.25.0 |
-
Release available in the Bazel Central Registry ↩
-
Wheels are available but work to add support is still ongoing. ↩
-
Release available on the SWIG website, or use the git tag on its GitHub repository ↩
-
Python 3.14 includes the new
compression.zstdmodule, backports are available under backport.zstd for Python 3.9-3.13 ↩