diff --git a/.github/workflows/build-models.yml b/.github/workflows/build-models.yml
index 48d44c7..00c875a 100644
--- a/.github/workflows/build-models.yml
+++ b/.github/workflows/build-models.yml
@@ -19,6 +19,10 @@ jobs:
 
       - uses: astral-sh/setup-uv@v5
 
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
       - id: find
         name: Discover models
         run: |
@@ -31,7 +35,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        model: ${{ fromJson(needs.discover.outputs.models) }}
+        include: ${{ fromJson(needs.discover.outputs.models) }}
     steps:
       - uses: actions/checkout@v4
         with:
@@ -39,25 +43,29 @@ jobs:
 
       - uses: astral-sh/setup-uv@v5
 
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
       - name: Install dependencies
-        run: uv sync --group all-models
+        run: uv sync --group ${{ matrix.dep_group }}
 
       - name: Download checkpoints
-        run: uv run dtai setup ${{ matrix.model }}
+        run: uv run dtai setup ${{ matrix.id }}
 
       - name: Convert to ONNX
-        run: uv run dtai convert ${{ matrix.model }}
+        run: uv run dtai convert ${{ matrix.id }}
 
       - name: Validate output
-        run: uv run dtai validate ${{ matrix.model }}
+        run: uv run dtai validate ${{ matrix.id }}
 
       - name: Package model
-        run: uv run dtai package ${{ matrix.model }}
+        run: uv run dtai package ${{ matrix.id }}
 
       - uses: actions/upload-artifact@v4
         with:
-          name: ${{ matrix.model }}
-          path: output/${{ matrix.model }}.dtmodel
+          name: ${{ matrix.id }}
+          path: output/${{ matrix.id }}.dtmodel
 
   publish:
     needs: build
diff --git a/.github/workflows/check-models.yml b/.github/workflows/check-models.yml
new file mode 100644
index 0000000..acd93a2
--- /dev/null
+++ b/.github/workflows/check-models.yml
@@ -0,0 +1,68 @@
+name: Check Models
+
+on:
+  pull_request:
+    branches: [master]
+  push:
+    branches: [master]
+
+permissions:
+  contents: read
+
+jobs:
+  discover:
+    runs-on: ubuntu-latest
+    outputs:
+      models: ${{ steps.find.outputs.models }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+
+      - uses: astral-sh/setup-uv@v5
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - id: find
+        name: Discover non-skipped models
+        run: |
+          models=$(uv run dtai list --json-output)
+          echo "models=$models" >> "$GITHUB_OUTPUT"
+          echo "Will check: $models"
+
+  check:
+    needs: discover
+    if: ${{ needs.discover.outputs.models != '[]' }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include: ${{ fromJson(needs.discover.outputs.models) }}
+    name: ${{ matrix.id }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+
+      - uses: astral-sh/setup-uv@v5
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install dependencies
+        run: uv sync --group ${{ matrix.dep_group }}
+
+      - name: Download checkpoints
+        run: uv run dtai setup ${{ matrix.id }}
+
+      - name: Convert to ONNX
+        run: uv run dtai convert ${{ matrix.id }}
+
+      - name: Validate output
+        run: uv run dtai validate ${{ matrix.id }}
+
+      - name: Run demo
+        run: uv run dtai demo ${{ matrix.id }}
diff --git a/darktable_ai/cli.py b/darktable_ai/cli.py
index 221532c..61ef60c 100644
--- a/darktable_ai/cli.py
+++ b/darktable_ai/cli.py
@@ -26,10 +26,27 @@ def _load_config(root: Path, model_id: str) -> ModelConfig:
     return load_model_config(model_dir, root)
 
 
-def _for_each_model(root: Path, model_id: str | None, callback) -> None:
+def _sync_deps(config: ModelConfig) -> None:
+    """Ensure the model's dependency group is installed."""
+    group = config.dep_group
+    if group == "core":
+        return
+    click.echo(f"  Syncing dependency group: {group}")
+    subprocess.run(
+        ["uv", "sync", "--group", group],
+        cwd=str(config.root_dir),
+        check=True,
+    )
+
+
+def _for_each_model(
+    root: Path, model_id: str | None, callback, *, sync: bool = False
+) -> None:
     """Run callback for one model or all non-skipped models."""
     if model_id:
         config = _load_config(root, model_id)
+        if sync:
+            _sync_deps(config)
         callback(config)
     else:
         for config in discover_models(root):
@@ -39,6 +56,8 @@ def _for_each_model(root: Path, model_id: str | None, callback) -> None:
             click.echo(f"\n{'=' * 40}")
             click.echo(f"  {config.id}")
             click.echo(f"{'=' * 40}")
+            if sync:
+                _sync_deps(config)
             callback(config)
 
 
@@ -61,12 +80,16 @@ def setup(ctx, model_id):
     root = _get_root(ctx)
 
     def _setup(config: ModelConfig):
-        if config.checkpoints:
-            download_checkpoints(config.checkpoints, root)
-
-        if config.repo and config.repo.setup:
+        if config.repo:
             repo_dir = config.repo_dir
-            if repo_dir and repo_dir.is_dir():
+            if repo_dir and not repo_dir.is_dir():
+                click.echo(f"  Initializing submodule: {config.repo.submodule}")
+                subprocess.run(
+                    ["git", "submodule", "update", "--init", config.repo.submodule],
+                    cwd=str(root), check=True,
+                )
+
+            if config.repo.setup and repo_dir and repo_dir.is_dir():
                 click.echo(f"  Running repo setup: {config.repo.setup}")
                 env = os.environ.copy()
                 env["DTAI_ROOT"] = str(root)
@@ -74,12 +97,9 @@ def _setup(config: ModelConfig):
                     config.repo.setup, shell=True,
                     cwd=str(repo_dir), env=env, check=True,
                 )
-            else:
-                click.echo(
-                    f"  Warning: submodule not found at {repo_dir}. "
-                    f"Run: git submodule update --init",
-                    err=True,
-                )
+
+        if config.checkpoints:
+            download_checkpoints(config.checkpoints, root)
 
     _for_each_model(root, model_id, _setup)
 
@@ -92,7 +112,7 @@ def convert(ctx, model_id):
     from darktable_ai.convert import run_conversion
 
     root = _get_root(ctx)
-    _for_each_model(root, model_id, run_conversion)
+    _for_each_model(root, model_id, run_conversion, sync=True)
 
 
 @main.command()
@@ -103,7 +123,7 @@ def validate(ctx, model_id):
     from darktable_ai.validate import run_validation
 
     root = _get_root(ctx)
-    _for_each_model(root, model_id, run_validation)
+    _for_each_model(root, model_id, run_validation, sync=True)
 
 
 @main.command("package")
@@ -125,7 +145,7 @@ def demo(ctx, model_id):
     from darktable_ai.demo import run_demo
 
     root = _get_root(ctx)
-    _for_each_model(root, model_id, run_demo)
+    _for_each_model(root, model_id, run_demo, sync=True)
 
 
 @main.command()
@@ -157,7 +177,7 @@ def _run_pipeline(config: ModelConfig):
         click.echo("\n=== Demo ===")
         run_demo(config)
 
-    _for_each_model(root, model_id, _run_pipeline)
+    _for_each_model(root, model_id, _run_pipeline, sync=True)
 
 
 @main.command("list")
@@ -169,8 +189,11 @@ def list_models(ctx, as_json):
     models = discover_models(root)
 
     if as_json:
-        ids = [m.id for m in models if not m.skip]
-        click.echo(json.dumps(ids))
+        matrix = [
+            {"id": m.id, "dep_group": m.dep_group}
+            for m in models if not m.skip
+        ]
+        click.echo(json.dumps(matrix))
     else:
         for config in models:
             status = " (skipped)" if config.skip else ""
diff --git a/darktable_ai/config.py b/darktable_ai/config.py
index 9ec1850..666cc12 100644
--- a/darktable_ai/config.py
+++ b/darktable_ai/config.py
@@ -38,6 +38,7 @@ class ModelConfig:
     description: str
     task: str
     type: str = "single"
+    arch: str = "generic"
     tiling: bool = False
     dep_group: str = "core"
     skip: bool = False
@@ -109,6 +110,7 @@ def load_model_config(model_dir: Path, root_dir: Path) -> ModelConfig:
         description=data["description"],
         task=data["task"],
         type=data.get("type", "single"),
+        arch=data.get("arch", "generic"),
         tiling=data.get("tiling", False),
         dep_group=data.get("dep_group", "core"),
         skip=skip,
diff --git a/darktable_ai/convert.py b/darktable_ai/convert.py
index 4738f83..a36f339 100644
--- a/darktable_ai/convert.py
+++ b/darktable_ai/convert.py
@@ -40,6 +40,7 @@ def generate_config_json(config: ModelConfig) -> None:
         "name": config.name,
         "description": config.description,
         "task": config.task,
+        "arch": config.arch,
         "backend": "onnx",
         "version": "1.0",
         "tiling": config.tiling,