Added Test support for Python 3.15

[p-r-a-v-i-n]

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Type of change

Please delete options that are not relevant.

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

The Python 3.15 beta is out. so from source:

We strongly encourage maintainers of third-party Python projects to test with 3.15 during the beta phase and report issues found to the Python bug tracker as soon as possible. While the release is planned to be feature-complete entering the beta phase, it is possible that features may be modified or, in rare cases, removed up until the start of the release candidate phase (2026-08-04). Our goal is to have no ABI changes after beta 4 and as few code changes as possible after the first release candidate. To achieve that, it will be extremely important to get as much exposure for 3.15 as possible during the beta phase.

This includes creating pre-release wheels for 3.15, as it helps other projects to do their own testing. However, we recommend that your regular production releases wait until 3.15.0rc1, to avoid the risk of ABI breaks.

I took reference from #5859
does this make sense ?

[greptile-apps]

Greptile Summary

The PR expands CI coverage to Python 3.15 and moves both performance workflows from Python 3.14 to Python 3.15.

• Adds Python 3.15 to unit, integration, and app-harness test matrices.
• Runs benchmark and Lighthouse performance jobs with Python 3.15.
• Enables prerelease selection for the benchmark job’s direct Python setup.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
.github/workflows/integration_app_harness.yml	Adds Python 3.15 to both app-harness test matrices using the existing uv-based environment setup.
.github/workflows/integration_tests.yml	Adds Python 3.15 coverage to the cross-platform integration-test matrix.
.github/workflows/performance.yml	Moves benchmark and Lighthouse jobs to Python 3.15 and explicitly enables prereleases for the direct setup-python path.
.github/workflows/unit_tests.yml	Adds Python 3.15 to the Linux and Windows unit-test matrix.

_{Reviews (3): Last reviewed commit: "Added Test support for Python 3.15" | Re-trigger Greptile}

[cubic-dev-ai]

1 issue found across 4 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name=".github/workflows/unit_tests.yml">

<violation number="1" location=".github/workflows/unit_tests.yml:31">
P2: The `unit-tests` matrix adds "3.15", but the sibling `unit-tests-macos` matrix in the same file still only lists 3.10–3.14. Since this PR is titled "Added Test support for Python 3.15" and every other workflow already runs 3.15 on linux/windows, Python 3.15 is left untested on macos (the macos job runs on every main push). Add "3.15" to the macos matrix as well, or confirm the omission is intentional.</violation>
</file>

<sub>Reply with feedback, questions, or to request a fix.

Re-trigger cubic</sub>

[cubic-dev-ai]

P2: The unit-tests matrix adds "3.15", but the sibling unit-tests-macos matrix in the same file still only lists 3.10–3.14. Since this PR is titled "Added Test support for Python 3.15" and every other workflow already runs 3.15 on linux/windows, Python 3.15 is left untested on macos (the macos job runs on every main push). Add "3.15" to the macos matrix as well, or confirm the omission is intentional.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At .github/workflows/unit_tests.yml, line 31:

<comment>The `unit-tests` matrix adds "3.15", but the sibling `unit-tests-macos` matrix in the same file still only lists 3.10–3.14. Since this PR is titled "Added Test support for Python 3.15" and every other workflow already runs 3.15 on linux/windows, Python 3.15 is left untested on macos (the macos job runs on every main push). Add "3.15" to the macos matrix as well, or confirm the omission is intentional.</comment>

<file context>
@@ -28,7 +28,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest]
-        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14", "3.15"]
     runs-on: ${{ matrix.os }}
 
</file context>