In the free-threaded build, some objects are immortal. Immortal objects are not deallocated and have reference counts that are never modified. This is done to avoid reference count contention that would prevent efficient multi-threaded scaling.

February 23, 2026 - CPython’s free-threaded mode (PEP 703), initially added in 3.13, has been significantly improved in Python 3.14. The implementation described in PEP 703 has been finished, including C API changes, and temporary workarounds in the interpreter were replaced with more permanent solutions.

October 12, 2025 - A detailed walkthrough of how to get started with and effectively use the new free-threaded (no-GIL) builds in Python 3.14 to achieve true parallelism for your CPU-bound, multi-threaded applications.

With the acceptance of PEP 779 - Criteria for supported status for free-threaded Python, the free-threaded interpreter is no longer considered experimental starting in Python 3.14, although it is not yet the default interpreter build.

October 8, 2025 - Python 3.14, the free-threaded (or no-GIL) version of the Python interpreter is FINALLY here, marking one of the most significant changes in Python’s history.

In 3.14 this interpreter appears to still be slower than the standard interpreter, but the difference is much smaller, with free-threading running at just 91% of the speed of the standard interpreter.

October 18, 2025 - ... In this article, we discuss a potentially groundbreaking feature of the latest Python 3.14 release: the introduction of an optional “free-threaded” version, which removes the Global Interpreter Lock (GIL).

As of Python 3.14, the free-threaded (or no-GIL) version of the Python interpreter is no longer considered experimental.

CPython’s free-threaded mode (PEP 703), initially added in 3.13, has been significantly improved in Python 3.14. The implementation described in PEP 703 has been finished, including C API changes, and temporary workarounds in the interpreter were replaced with more permanent solutions.

October 8, 2025 - The Python team has released version 3.14, with big new features including free threading support, the ability to use concurrent interpreters, improved debugger support, and an opt-in new interpreter which improves performance by 3 to 5 percent.

July 7, 2025 - Python 3.14's free-threaded interpreter is now officially supported—plus more key updates from the world of Python you don't want to miss!

CPython’s free-threaded mode (PEP 703), initially added in 3.13, has been significantly improved in Python 3.14.

November 7, 2025 - Python 3.14 changes this with official support for free-threaded builds and the concurrent.interpreters module, enabling true CPU parallelism with up to 4x performance improvements for CPU-bound tasks.

October 9, 2025 - With the release of Python 3.14 ... free-threaded execution mode lets Python tap into multi-core processors, enabling true parallel processing for CPU-heavy workloads when enabled....

October 14, 2025 - That changes with Python 3.14. The new free-threaded build removes the GIL, allowing multiple threads to execute Python bytecode simultaneously.

February 3, 2026 - Some of the major new features and changes in Python 3.14 are: PEP 779: Free-threaded Python is officially supported

September 25, 2025 - The bigger story is that Python 3.14 carries the first supported version of free threaded mode. For decades Python has been bound by the Global Interpreter Lock. With 3.14 you can now build and run an interpreter that supports running threads ...

Python has officially introduce Python install manager and free-threading feature in 3.14, but I cannot find out how to enable free-threading feature with Python install manager. Is there a way to

May 13, 2025 - Implemented several specializations for the adaptive specializing interpreter and supported shipping optimizations that bring the single-threaded performance of free-threaded CPython 3.14 within spitting distance of the GIL-enabled build. A huge number of smaller bugfixes and thread safety improvements. We've also written a comprehensive guide for supporting free-threaded Python in existing apps and packages gleaned from our experiences.