gh-119132: Remove "experimental" tag from the CPython free-threading.

Doc/howto/free-threading-python.rst

@@ -1,18 +1,18 @@
 .. _freethreading-python-howto:
 
 **********************************************
-Python experimental support for free threading
+Python support for free threading
 **********************************************
 
-Starting with the 3.13 release, CPython has experimental support for a build of
+Starting with the 3.13 release, CPython has support for a build of
 Python called :term:`free threading` where the :term:`global interpreter lock`
 (GIL) is disabled.  Free-threaded execution allows for full utilization of the
 available processing power by running threads in parallel on available CPU cores.
 While not all software will benefit from this automatically, programs
 designed with threading in mind will run faster on multi-core hardware.
 
-**The free-threaded mode is experimental** and work is ongoing to improve it:
-expect some bugs and a substantial single-threaded performance hit.
+The free-threaded mode is working and continues to be improved:
+expect some bugs and a substantial performance hit in single-threaded workloads.
 
 This document describes the implications of free threading
 for Python code.  See :ref:`freethreading-extensions-howto` for information on
@@ -43,7 +43,7 @@ Identifying free-threaded Python
 ================================
 
 To check if the current interpreter supports free-threading, :option:`python -VV <-V>`
-and :data:`sys.version` contain "experimental free-threading build".
+and :data:`sys.version` contain "free-threading build".
 The new :func:`sys._is_gil_enabled` function can be used to check whether
 the GIL is actually disabled in the running process.
 

Lib/platform.py

@@ -1144,7 +1144,7 @@ def _sys_version(sys_version=None):
         # CPython
         cpython_sys_version_parser = re.compile(
             r'([\w.+]+)\s*'  # "version<space>"
-            r'(?:experimental free-threading build\s+)?' # "free-threading-build<space>"
+            r'(?:free-threading build\s+)?' # "free-threading-build<space>"
             r'\(#?([^,]+)'  # "(#buildno"
             r'(?:,\s*([\w ]*)'  # ", builddate"
             r'(?:,\s*([\w :]*))?)?\)\s*'  # ", buildtime)<space>"

Misc/NEWS.d/next/Build/2025-06-16-07-20-28.gh-issue-119132.fcI8s7.rst

@@ -0,0 +1 @@
+Remove "experimental" tag from the CPython free-threading.

Python/getversion.c

@@ -15,7 +15,7 @@ void _Py_InitVersion(void)
     }
     initialized = 1;
 #ifdef Py_GIL_DISABLED
-    const char *buildinfo_format = "%.80s experimental free-threading build (%.80s) %.80s";
+    const char *buildinfo_format = "%.80s free-threading build (%.80s) %.80s";
 #else
     const char *buildinfo_format = "%.80s (%.80s) %.80s";
 #endif

configure.ac

@@ -1716,7 +1716,7 @@ ABI_THREAD=""
 # --disable-gil
 AC_MSG_CHECKING([for --disable-gil])
 AC_ARG_ENABLE([gil],
-  [AS_HELP_STRING([--disable-gil], [enable experimental support for running without the GIL (default is no)])],
+  [AS_HELP_STRING([--disable-gil], [enable support for running without the GIL (default is no)])],
   [AS_VAR_IF([enable_gil], [yes], [disable_gil=no], [disable_gil=yes])], [disable_gil=no]
 )
 AC_MSG_RESULT([$disable_gil])