Python 3.13 Release News November 2025 [work] | Genuine |

The transition has not been seamless. One year in, the PyPI statistics show that now offer wheels compatible with the free-threaded build. Major libraries like NumPy, Pandas, and requests have successfully transitioned to support safe concurrent memory access. However, many C-extension modules still require the GIL, forcing users to choose between the "legacy build" and the "free-threaded build" depending on their dependency stack.

: Early benchmarks in 2025 show that code running on 3.13 is approximately 11% faster end-to-end and uses 10–15% less memory compared to Python 3.11. Refined Developer Experience python 3.13 release news november 2025

This brought the default Python experience closer to that of IPython or Jupyter, lowering the barrier to entry for beginners. The transition has not been seamless