Python 3.14 Enters Final Countdown with First Release Candidate: Free-Threaded CPython, JIT Compiler, and More on the Way
July 23, 2025
The Python development team has released Python 3.14.0rc1, the first release candidate ahead of the official launch set for October 7, 2025. This marks the final phase of development, with the codebase now frozen except for reviewed bug fixes. The ABI is also locked, allowing third-party developers to begin safely publishing compatible wheels to PyPI.
Python 3.14 introduces several major features, most notably official support for a free-threaded CPython, removing the Global Interpreter Lock (GIL) for many workloads and enabling true multithreading. An experimental just-in-time (JIT) compiler is also available for macOS and Windows builds, and the standard library now supports multiple interpreters, improving concurrency options.
Developers will benefit from new syntax features like template string literals (t-strings) and cleaner error-handling syntax. The REPL and several command-line tools now support syntax highlighting and color output, improving readability. The standard library adds native Zstandard compression and updated UUID support, while a new HMAC implementation enhances cryptographic security. Debugging sees a boost with a zero-overhead external debugger interface and support for remote pdb attachment.
Distribution practices are modernizing, with Sigstore replacing PGP for release verification and a new Windows install manager set to replace the traditional MSI installer. The second and final release candidate is planned for August 26, giving the community one last chance to test before the stable release.
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