diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 46cc44098..3b1f2c9dd 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -19,13 +19,6 @@ permissions:
 
 jobs:
   test:
-    runs-on: ${{ matrix.os }}
-    timeout-minutes: 60
-    env:
-      COVERAGE_PROCESS_START: "${{ github.workspace }}/.coveragerc"
-    defaults:
-      run:
-        shell: bash
     strategy:
       matrix:
         julia-version: ['1']
@@ -45,48 +38,20 @@ jobs:
             python-version: '3.8'
             os: ubuntu-latest
             test-id: include
-
-    steps:
-      - uses: actions/checkout@v4
-      - name: "Set up Julia"
-        uses: julia-actions/setup-julia@v2
-        with:
-          version: ${{ matrix.julia-version }}
-      - name: "Cache Julia"
-        uses: julia-actions/cache@v2
-        with:
-          cache-name: ${{ matrix.os }}-test-${{ matrix.julia-version }}-${{ matrix.python-version }}
-          cache-packages: false
-      - name: "Set up Python"
-        uses: actions/setup-python@v5
-        with:
-          python-version: ${{ matrix.python-version }}
-          cache: pip
-      - name: "Install PySR"
-        run: |
-            python -m pip install --upgrade pip
-            pip install '.[dev]'
-            python -c 'import pysr'
-      - name: "Assert Julia version"
-        if: ${{ matrix.julia-version != '1'}}
-        run: python3 -c "from pysr import jl; assert jl.VERSION.major == jl.seval('v\"${{ matrix.julia-version }}\"').major; assert jl.VERSION.minor == jl.seval('v\"${{ matrix.julia-version }}\"').minor"
-      - name: "Set up coverage for subprocesses"
-        run: echo 'import coverage; coverage.process_startup()' > "${{ github.workspace }}/sitecustomize.py"
-      - name: "Run tests"
-        run: coverage run -m pysr test main,cli,startup
-      - name: "Run JAX tests"
-        run: coverage run --append -m pysr test jax
-        if: ${{ matrix.test-id == 'main' }}
-      - name: "Run Torch tests"
-        run: coverage run --append -m pysr test torch
-        if: ${{ matrix.test-id == 'main' }}
-      - name: "Build coverage report"
-        run: coverage xml
-      - name: "Upload results to Codecov"
-        uses: codecov/codecov-action@v5
-        with:
-          token: ${{ secrets.CODECOV_TOKEN }}
-          slug: MilesCranmer/PySR
+    uses: ./.github/workflows/reusable.yml
+    with:
+      os: ${{ matrix.os }}
+      python-version: ${{ matrix.python-version }}
+      julia-version: ${{ matrix.julia-version }}
+      run-coverage: true
+      extra-tests: |
+        echo 'import coverage; coverage.process_startup()' > "${{ github.workspace }}/sitecustomize.py"
+        if [[ "${{ matrix.test-id }}" == "main" ]]; then
+          coverage run --append -m pysr test jax
+          coverage run --append -m pysr test torch
+        fi
+        coverage xml
+    secrets: inherit
 
   dev_install:
     runs-on: ${{ matrix.os }}
diff --git a/.github/workflows/CI_Windows.yml b/.github/workflows/CI_Windows.yml
index 1f5c916cc..b5817d1b0 100644
--- a/.github/workflows/CI_Windows.yml
+++ b/.github/workflows/CI_Windows.yml
@@ -16,42 +16,11 @@ on:
 
 jobs:
   test:
-    runs-on: ${{ matrix.os }}
-    timeout-minutes: 60
-    defaults:
-      run:
-        shell: bash
-    strategy:
-      matrix:
-        julia-version: ['1']
-        python-version: ['3.13']
-        os: [windows-latest]
-
-    steps:
-      - uses: actions/checkout@v4
-      - name: "Set up Julia"
-        uses: julia-actions/setup-julia@v2
-        with:
-          version: ${{ matrix.julia-version }}
-      - name: "Cache Julia"
-        uses: julia-actions/cache@v2
-        with:
-          cache-name: ${{ matrix.os }}-test-${{ matrix.julia-version }}-${{ matrix.python-version }}
-          cache-packages: false
-      - name: "Set up Python"
-        uses: actions/setup-python@v5
-        with:
-          python-version: ${{ matrix.python-version }}
-          cache: pip
-      - name: "Install PySR"
-        run: |
-            python -m pip install --upgrade pip
-            pip install '.[dev]'
-            python -c 'import pysr'
-      - name: "Run tests"
-        run: |
-            python -m pysr test main,cli,startup
-      - name: "Install Torch"
-        run: pip install torch # (optional import)
-      - name: "Run Torch tests"
-        run: python -m pysr test torch
+    uses: ./.github/workflows/reusable.yml
+    with:
+      os: windows-latest
+      python-version: '3.13'
+      julia-version: '1'
+      extra-tests: |
+        pip install torch
+        python -m pysr test torch
diff --git a/.github/workflows/CI_mac.yml b/.github/workflows/CI_mac.yml
index 20514dd06..a86e05527 100644
--- a/.github/workflows/CI_mac.yml
+++ b/.github/workflows/CI_mac.yml
@@ -16,42 +16,11 @@ on:
 
 jobs:
   test:
-    runs-on: ${{ matrix.os }}
-    timeout-minutes: 60
-    defaults:
-      run:
-        shell: bash
-    strategy:
-      matrix:
-        julia-version: ['1']
-        python-version: ['3.13']
-        os: [macos-latest]
-
-    steps:
-      - uses: actions/checkout@v4
-      - name: "Set up Julia"
-        uses: julia-actions/setup-julia@v2
-        with:
-          version: ${{ matrix.julia-version }}
-      - name: "Cache Julia"
-        uses: julia-actions/cache@v2
-        with:
-          cache-name: ${{ matrix.os }}-test-${{ matrix.julia-version }}-${{ matrix.python-version }}
-          cache-packages: false
-      - name: "Set up Python"
-        uses: actions/setup-python@v5
-        with:
-          python-version: ${{ matrix.python-version }}
-          cache: pip
-      - name: "Install PySR"
-        run: |
-            python -m pip install --upgrade pip
-            pip install '.[dev]'
-            python -c 'import pysr'
-      - name: "Run tests"
-        run: |
-            python -m pysr test main,cli,startup
-      - name: "Run JAX tests"
-        run: python -m pysr test jax
-      - name: "Run Torch tests"
-        run: python -m pysr test torch
+    uses: ./.github/workflows/reusable.yml
+    with:
+      os: macos-latest
+      python-version: '3.13'
+      julia-version: '1'
+      extra-tests: |
+        python -m pysr test jax
+        python -m pysr test torch
diff --git a/.github/workflows/reusable.yml b/.github/workflows/reusable.yml
new file mode 100644
index 000000000..03c31065b
--- /dev/null
+++ b/.github/workflows/reusable.yml
@@ -0,0 +1,93 @@
+name: Reusable PySR Test Workflow
+
+on:
+  workflow_call:
+    inputs:
+      os:
+        required: true
+        type: string
+      python-version:
+        required: false
+        type: string
+        default: '3.13'
+      julia-version:
+        required: false
+        type: string
+        default: '1'
+      run-coverage:
+        required: false
+        type: boolean
+        default: false
+      extra-tests:
+        required: false
+        type: string
+        default: ''
+
+jobs:
+  test:
+    runs-on: ${{ inputs.os }}
+    timeout-minutes: 60
+    defaults:
+      run:
+        shell: bash
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: "Set up Python"
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ inputs.python-version }}
+          cache: pip
+
+
+      - name: "Set up Julia"
+        uses: julia-actions/setup-julia@v2
+        with:
+          version: ${{ inputs.julia-version }}
+
+      - name: "Cache Julia"
+        uses: julia-actions/cache@v2
+
+      - name: "Install PySR"
+        run: |
+          python -m pip install --upgrade pip
+          pip install '.[dev]'
+          python -c 'import pysr'
+
+      - name: "Assert Julia version"
+        if: ${{ inputs.julia-version != '1' }}
+        run: python -c "from pysr import _get_julia_project; print(_get_julia_project().julia_version); assert _get_julia_project().julia_version.startswith('${{ inputs.julia-version }}')"
+
+      - name: "Set environment variables"
+        run: |
+          echo "PYSR_TEST_JULIA_VERSION=${{ inputs.julia-version }}" >> $GITHUB_ENV
+          echo "PYSR_TEST_PYTHON_VERSION=${{ inputs.python-version }}" >> $GITHUB_ENV
+          if [[ "${{ inputs.run-coverage }}" == "true" ]]; then
+            echo "COVERAGE_PROCESS_START=${{ github.workspace }}/.coveragerc" >> $GITHUB_ENV
+          fi
+
+      - name: "Run tests"
+        run: |
+          if [[ "${{ inputs.run-coverage }}" == "true" ]]; then
+            coverage run -m pysr test main,cli,startup
+          else
+            python -m pysr test main,cli,startup
+          fi
+
+      - name: "Run extra tests"
+        if: ${{ inputs.extra-tests != '' }}
+        run: ${{ inputs.extra-tests }}
+
+      - name: "Generate coverage report"
+        if: ${{ inputs.run-coverage }}
+        run: |
+          coverage combine
+          coverage report -m
+
+      - name: "Upload results to Codecov"
+        if: ${{ inputs.run-coverage }}
+        uses: codecov/codecov-action@v5
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          slug: MilesCranmer/PySR