On Friday, October 9, Python 3.15.0 becomes generally available with lazy imports, a built-in frozendict, UTF-8 as the default encoding, stronger free-threaded-build support and an upgraded experimental JIT. The release matters to engineers planning runtime upgrades, packaging changes, performance work and C API migrations.Python 3.15 does not exist. The current stable release is Python 3.13 (October 2024), with 3.14 in development; no such features or October 9 release have occurred.