Enable support for Python 3.15

.github/AGENTS.md

@@ -3,7 +3,7 @@
 CI/CD workflows, automation, security scanning, and package distribution.
 
 ## Workflows
-All build/test workflows cover Python 3.10-3.14 plus free-threaded 3.14t.
+All build/test workflows cover Python 3.10-3.15 plus free-threaded 3.14t.
 
 - **conda-package.yml** — main build/test pipeline (Linux/Windows)
 - **conda-package-cf.yml** — build/test using only conda-forge channel (Linux/Windows)
@@ -17,8 +17,9 @@ All build/test workflows cover Python 3.10-3.14 plus free-threaded 3.14t.
 - Keep build matrix (Python versions, platforms) in workflow files only
 - Required checks: conda build + test on supported Python versions/platforms in CI
 - Python 3.14 is expressed as two `include` rows carrying `python_spec` (`3.14.* *_cp314` and `3.14.* *_cp314t`); a bare `--python 3.14` has been observed to select the free-threaded ABI and must not be relied on
+- Python 3.15 is GIL-only for now (conda-forge's `python315` migration ships `*_cp315` but not `*_cp315t`); conda jobs pin the ABI explicitly with `python_spec: '3.15.* *_cp315'` to stay robust if a free-threaded `3.15t` build appears later
 - `include` rows create new matrix combinations and inherit nothing, so `experimental` must be repeated wherever the job reads them
-- Artifact naming: `$PACKAGE_NAME $OS Python $VERSION`, where `$VERSION` is `python_tag` (`3.14` or `3.14t`) when set, otherwise `python`
+- Artifact naming: `$PACKAGE_NAME $OS Python $VERSION`, where `$VERSION` is `python_tag` (`3.14`, `3.14t`, or `3.15`) when set, otherwise `python`
 - Channels: `conda-forge`, Intel channel
 
 ## Security

.github/workflows/build-with-clang.yml

@@ -14,8 +14,9 @@ jobs:
     runs-on: ubuntu-latest
 
     strategy:
+      fail-fast: false
       matrix:
-        python: ["3.10", "3.11", "3.12", "3.13", "3.14", "3.14t"]
+        python: ["3.10", "3.11", "3.12", "3.13", "3.14", "3.14t", "3.15"]
 
     env:
       ONEAPI_ROOT: /opt/intel/oneapi
@@ -47,6 +48,8 @@ jobs:
         uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
         with:
           python-version: ${{ matrix.python }}
+          # allow the 3.15 release candidate until 3.15 is final
+          allow-prereleases: true
           architecture: x64
 
       - name: Checkout repo

.github/workflows/build-with-standard-clang.yml

@@ -13,8 +13,9 @@ jobs:
     runs-on: ubuntu-latest
 
     strategy:
+      fail-fast: false
       matrix:
-        python: ["3.10", "3.11", "3.12", "3.13", "3.14", "3.14t"]
+        python: ["3.10", "3.11", "3.12", "3.13", "3.14", "3.14t", "3.15"]
 
     env:
       COMPILER_ROOT: /usr/bin
@@ -38,6 +39,8 @@ jobs:
         uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
         with:
           python-version: ${{ matrix.python }}
+          # allow the 3.15 release candidate until 3.15 is final
+          allow-prereleases: true
           architecture: x64
 
       - name: Checkout repo

.github/workflows/build_pip.yml

@@ -17,13 +17,16 @@ jobs:
         shell: bash -el {0}
 
     strategy:
+      fail-fast: false
       matrix:
         python: ["3.10", "3.11", "3.12", "3.13"]
         include:
           - python: '3.14'
             python_spec: '3.14.* *_cp314'
           - python: '3.14'
             python_spec: '3.14.* *_cp314t'
+          - python: '3.15'
+            python_spec: '3.15.* *_cp315'
 
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
@@ -34,7 +37,8 @@ jobs:
       - uses: conda-incubator/setup-miniconda@8ee1f361103df19b6f8c8655fd3967a8ecb162d5 # v4.0.1
         with:
           miniforge-version: latest
-          channels: conda-forge
+          # python_rc label carries the 3.15 release candidate; drop once 3.15 is final
+          channels: conda-forge,conda-forge/label/python_rc
           activate-environment: test
           python-version: ${{ matrix.python }}
 

.github/workflows/conda-build-test.yml

@@ -54,6 +54,9 @@ jobs:
           - python: '3.14'
             python_spec: '3.14.* *_cp314t'
             python_tag: '3.14t'
+          - python: '3.15'
+            python_spec: '3.15.* *_cp315'
+            python_tag: '3.15'
 
     runs-on: ${{ inputs.runs-on }}
     timeout-minutes: 15
@@ -78,7 +81,8 @@ jobs:
         with:
           miniforge-version: latest
           activate-environment: ${{ env.build-env-name }}
-          channels: conda-forge
+          # python_rc label carries the 3.15 release candidate; drop once 3.15 is final
+          channels: conda-forge,conda-forge/label/python_rc
           python-version: ${{ matrix.python }}
 
       - name: Cache conda packages
@@ -142,6 +146,9 @@ jobs:
           - python: '3.14'
             python_spec: '3.14.* *_cp314t'
             python_tag: '3.14t'
+          - python: '3.15'
+            python_spec: '3.15.* *_cp315'
+            python_tag: '3.15'
 
     runs-on: ${{ inputs.runs-on }}
     timeout-minutes: 15
@@ -167,7 +174,8 @@ jobs:
         uses: conda-incubator/setup-miniconda@8ee1f361103df19b6f8c8655fd3967a8ecb162d5 # v4.0.1
         with:
           miniforge-version: latest
-          channels: conda-forge
+          # python_rc label carries the 3.15 release candidate; drop once 3.15 is final
+          channels: conda-forge,conda-forge/label/python_rc
           activate-environment: ${{ env.test-env-name }}
           python-version: ${{ matrix.python }}
 

.github/workflows/conda-package-cf.yml

@@ -21,7 +21,7 @@ jobs:
       runs-on: ubuntu-latest
       conda-subdir: linux-64
       pkgs-dir: /home/runner/conda_pkgs_dir
-      channels-list: -c conda-forge --override-channels
+      channels-list: -c conda-forge -c conda-forge/label/python_rc --override-channels
       recipe-dir: conda-recipe-cf
 
   windows:
@@ -31,7 +31,7 @@ jobs:
       runs-on: windows-latest
       conda-subdir: win-64
       pkgs-dir: D:\conda_pkgs_dir
-      channels-list: -c conda-forge --override-channels
+      channels-list: -c conda-forge -c conda-forge/label/python_rc --override-channels
       recipe-dir: conda-recipe-cf
 
   osx:
@@ -41,5 +41,5 @@ jobs:
       runs-on: macos-26-intel
       conda-subdir: osx-64
       pkgs-dir: /Users/runner/conda_pkgs_dir
-      channels-list: -c conda-forge --override-channels
+      channels-list: -c conda-forge -c conda-forge/label/python_rc --override-channels
       recipe-dir: conda-recipe-cf

.github/workflows/conda-package.yml

@@ -21,7 +21,7 @@ jobs:
       runs-on: ubuntu-latest
       conda-subdir: linux-64
       pkgs-dir: /home/runner/conda_pkgs_dir
-      channels-list: -c https://software.repos.intel.com/python/conda -c conda-forge --override-channels
+      channels-list: -c https://software.repos.intel.com/python/conda -c conda-forge -c conda-forge/label/python_rc --override-channels
       recipe-dir: conda-recipe
       build-wheels: true
 
@@ -32,6 +32,6 @@ jobs:
       runs-on: windows-latest
       conda-subdir: win-64
       pkgs-dir: D:\conda_pkgs_dir
-      channels-list: -c https://software.repos.intel.com/python/conda -c conda-forge --override-channels
+      channels-list: -c https://software.repos.intel.com/python/conda -c conda-forge -c conda-forge/label/python_rc --override-channels
       recipe-dir: conda-recipe
       build-wheels: true

AGENTS.md

@@ -46,8 +46,9 @@ python -m pip install --no-deps --no-build-isolation .
 
 ## CI/CD
 - **Platforms in CI workflows:** Linux, Windows, macOS (conda-forge workflow only)
-- **Python versions:** 3.10, 3.11, 3.12, 3.13, 3.14, and free-threaded 3.14t
+- **Python versions:** 3.10, 3.11, 3.12, 3.13, 3.14, 3.15, and free-threaded 3.14t
 - **Python 3.14 ABI selection:** conda jobs must request an explicit ABI, `3.14.* *_cp314` (GIL) or `3.14.* *_cp314t` (free-threaded). Once the recipes stopped constraining `python-gil`, a bare `--python 3.14` was observed to resolve to the free-threaded build, so it must not be relied on.
+- **Python 3.15:** GIL-only for now; conda-forge's `python315` migration provides `*_cp315` but no free-threaded `*_cp315t` yet. Conda jobs pin `3.15.* *_cp315` explicitly for the same ABI-selection reason as 3.14.
 - **Workflows:** `.github/workflows/`
   - `conda-package.yml` — main conda build/test pipeline
   - `conda-package-cf.yml` — conda build/test using only conda-forge channel

CHANGELOG.md

@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [dev] (MM/DD/YYYY)
 
 ### Added
+* Enabled support of Python 3.15 [gh-243](https://github.com/IntelPython/mkl-service/pull/243)
 * Added support for free-threaded (GIL-disabled) CPython builds: the Cython extension is compiled with `freethreading_compatible=True` and `_mklinit` declares `Py_MOD_GIL_NOT_USED`, so importing `mkl` no longer re-enables the GIL [gh-213](https://github.com/IntelPython/mkl-service/pull/213)
 * Added support for new build option `ilp64` to initialize MKL with the ILP64 interface, which also resolves some build warnings [gh-184](https://github.com/IntelPython/mkl-service/pull/184)
 

conda-recipe/AGENTS.md

@@ -10,7 +10,7 @@ Conda package build recipe for conda-forge and Intel channel distribution.
 
 ## Build configuration
 - **Channels:** `conda-forge`, Intel channel
-- **Python versions in CI build matrix:** 3.10, 3.11, 3.12, 3.13, 3.14, and free-threaded 3.14t
+- **Python versions in CI build matrix:** 3.10, 3.11, 3.12, 3.13, 3.14, 3.15, and free-threaded 3.14t
 - **Compilers:** pinned via `conda_build_config.yaml` (GCC/GXX on Linux, VS2022 on Windows)
 - **Dependencies:** `mkl` (runtime), `mkl-devel` (build), `cython >=3.1.0`
 

pyproject.toml

@@ -47,6 +47,7 @@ classifiers = [
   "Programming Language :: Python :: 3.12",
   "Programming Language :: Python :: 3.13",
   "Programming Language :: Python :: 3.14",
+  "Programming Language :: Python :: 3.15",
   "Programming Language :: Python :: Free Threading :: 2 - Beta",
   "Programming Language :: Python :: Implementation :: CPython",
   "Topic :: Software Development",
@@ -62,7 +63,7 @@ keywords = ["MKL"]
 license = "BSD-3-Clause"
 name = "mkl-service"
 readme = {file = "README.md", content-type = "text/markdown"}
-requires-python = ">=3.10,<3.15"
+requires-python = ">=3.10,<3.16"
 
 [project.optional-dependencies]
 test = ["pytest"]