diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..bc424a8
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,124 @@
+name: GitHub-hosted
+
+on:
+  push:
+    branches: [master, main]
+  pull_request:
+
+env:
+  CMAKE_BUILD_PARALLEL_LEVEL: 4
+
+jobs:
+  build-and-test:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: ubuntu-24.04
+            llvm: 20
+            python: "3.12"
+            runtime_cxx_standard: 17
+          - os: ubuntu-24.04
+            llvm: 21
+            python: "3.13"
+            runtime_cxx_standard: 20
+          - os: ubuntu-24.04
+            llvm: 21
+            python: "3.14"
+            runtime_cxx_standard: 20
+          - os: macos-15
+            llvm: 20
+            python: "3.12"
+            runtime_cxx_standard: 20
+
+    runs-on: ${{ matrix.os }}
+    name: ${{ matrix.os }} / LLVM ${{ matrix.llvm }} / Py ${{ matrix.python }} / C++${{ matrix.runtime_cxx_standard }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python }}
+
+      - name: Install dependencies (Linux)
+        if: runner.os == 'Linux'
+        run: |
+          wget -qO- https://apt.llvm.org/llvm-snapshot.gpg.key | sudo gpg --dearmor -o /usr/share/keyrings/llvm-archive-keyring.gpg
+          echo "deb [signed-by=/usr/share/keyrings/llvm-archive-keyring.gpg] http://apt.llvm.org/$(lsb_release -cs)/ llvm-toolchain-$(lsb_release -cs)-${{ matrix.llvm }} main" \
+            | sudo tee /etc/apt/sources.list.d/llvm.list
+          sudo apt-get update
+          sudo apt-get install -y \
+            llvm-${{ matrix.llvm }}-dev \
+            libclang-${{ matrix.llvm }}-dev \
+            clang-${{ matrix.llvm }} \
+            libpolly-${{ matrix.llvm }}-dev \
+            libboost-dev libeigen3-dev
+
+      - name: Install dependencies (macOS)
+        if: runner.os == 'macOS'
+        run: brew install llvm@${{ matrix.llvm }} boost eigen
+
+      - name: pip install CppJIT
+        run: |
+          pip install pytest numpy psutil
+          pip install numba || true
+          pip install . -v --config-settings=cmake.define.LLVM_DIR=${{
+            runner.os == 'macOS'
+            && format('/opt/homebrew/opt/llvm@{0}/lib/cmake/llvm', matrix.llvm)
+            || format('/usr/lib/llvm-{0}/lib/cmake/llvm', matrix.llvm)
+          }}
+
+      - name: Build test dictionaries
+        run: make -j4
+        working-directory: test
+
+      - name: Run tests
+        run: python -m pytest -ra --tb=short -q 2>&1 | tee ../test-output.txt
+        working-directory: test
+        env:
+          CPPINTEROP_EXTRA_INTERPRETER_ARGS: "-std=c++${{ matrix.runtime_cxx_standard }}"
+
+      - name: Upload result
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: result-${{ matrix.os }}-llvm${{ matrix.llvm }}-py${{ matrix.python }}-cpp${{ matrix.runtime_cxx_standard }}
+          path: test-output.txt
+
+  report:
+    if: always() && github.event_name == 'pull_request'
+    needs: build-and-test
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          pattern: result-*
+
+      - uses: actions/github-script@v7
+        with:
+          script: |
+            const fs = require('fs');
+            const marker = '<!-- cppjit-ci -->';
+
+            const rows = fs.readdirSync('.').filter(d => d.startsWith('result-')).sort().map(d => {
+              const cfg = d.replace('result-', '');
+              const file = `${d}/test-output.txt`;
+              const lines = fs.existsSync(file) ? fs.readFileSync(file, 'utf8').trim().split('\n') : [];
+              const result = lines.length ? lines.at(-1) : 'no output';
+              return `| ${cfg} | \`${result}\` |`;
+            });
+
+            const body = [marker, '## Test Results', '| Configuration | Result |', '|---|---|', ...rows].join('\n');
+            const { data: comments } = await github.rest.issues.listComments({
+              ...context.repo, issue_number: context.issue.number,
+            });
+            const existing = comments.find(c => c.body.startsWith(marker));
+
+            if (existing) {
+              await github.rest.issues.updateComment({ ...context.repo, comment_id: existing.id, body });
+            } else {
+              await github.rest.issues.createComment({ ...context.repo, issue_number: context.issue.number, body });
+            }