Hi, With 3.13, CPython now has an experimental free-threaded mode (PEP 703). I understood from the PEP that the free-threaded mode is pushed in particular by some people working in AI/deep learning (for example with a team working at Meta on PyTorch). I also see that some work is being done in adapting the ecosystem to this new feature https://py-free-threading.github.io/ We will see what will happen in CPython, but if I understood correctly, this mode could become the default in few years for CPython. I now that PyPy devs are currently working on Python 3.11 support (and not yet 3.13!), but I was wondering about the technical feasibility of supporting the free-threaded mode in PyPy? I'm just guessing but it could be very difficult isn't it? Do you think it would be even possible to do that with PyPy? Best regards, Pierre