Python 3.14.0a5 is the fifth of seven planned alpha releases, introducing PEP 649 (deferred annotation evaluation), PEP 741 (enhanced Python configuration C API), and PEP 761 (switching from PGP signatures to Sigstore). It also features improved error messages and an experimental high-performance interpreter for newer compilers. Some older Python and C API features are being deprecated. As features may still change before beta (May 6, 2025), developers are encouraged to test and report issues. The next release, Python 3.14.0a6, arrives March 14, 2025.