diff --git a/test/test_sequential_models.py b/test/test_sequential_models.py
new file mode 100644
index 0000000..49d9e45
--- /dev/null
+++ b/test/test_sequential_models.py
@@ -0,0 +1,112 @@
+"""Sequential model contract tests across the trainer and Core repositories."""
+
+import json as _json
+from pathlib import Path as _Path
+from tempfile import TemporaryDirectory as _TemporaryDirectory
+
+import numpy as _np
+import torch as _torch
+from _integration import requires_loadmodel as _requires_loadmodel
+from _integration import requires_render as _requires_render
+from _integration import run_loadmodel as _run_loadmodel
+from _integration import run_render as _run_render
+from nam.data import np_to_wav, wav_to_np
+from nam.models.linear import Linear as _Linear
+from nam.models.sequential import Sequential as _Sequential
+
+_SAMPLE_RATE = 48_000
+_RTOL = 1.0e-5
+_ATOL = 1.0e-6
+
+
+def _linear(weights: list[float]) -> _Linear:
+    model = _Linear(receptive_field=len(weights), sample_rate=_SAMPLE_RATE)
+    model.import_weights(_torch.tensor(weights))
+    return model
+
+
+def _nested_sequential_model() -> _Sequential:
+    inner = _Sequential(models=[_linear([0.5, -0.25, 0.125]), _linear([1.2, -0.1])])
+    return _Sequential(models=[inner, _linear([-0.75, 0.2, 0.05])])
+
+
+def _export(model: _Sequential, outdir: _Path) -> tuple[_Path, dict]:
+    model.export(outdir, basename="sequential")
+    path = outdir / "sequential.nam"
+    assert path.exists()
+    return path, _json.loads(path.read_text(encoding="utf-8"))
+
+
+def _assert_complete_model(model: dict) -> None:
+    assert {"version", "architecture", "config", "weights"}.issubset(model)
+
+
+@_requires_loadmodel
+def test_trainer_sequential_export_matches_core_file_contract():
+    model = _nested_sequential_model()
+
+    with _TemporaryDirectory() as tmpdir:
+        path, exported = _export(model, _Path(tmpdir))
+
+        assert exported["version"] == "0.7.0"
+        assert exported["architecture"] == "Sequential"
+        assert exported["weights"] == []
+        assert exported["sample_rate"] == _SAMPLE_RATE
+        assert "weights_version" not in exported["config"]
+
+        children = exported["config"]["models"]
+        assert [child["architecture"] for child in children] == [
+            "Sequential",
+            "Linear",
+        ]
+        for child in children:
+            _assert_complete_model(child)
+        for grandchild in children[0]["config"]["models"]:
+            _assert_complete_model(grandchild)
+
+        result = _run_loadmodel(path)
+        assert result.returncode == 0, (
+            "Core loadmodel rejected the trainer's Sequential export: "
+            f"stderr={result.stderr!r} stdout={result.stdout!r}"
+        )
+
+
+@_requires_render
+def test_trainer_and_core_sequential_numerical_agreement():
+    model = _nested_sequential_model()
+    model.eval()
+    t = _np.arange(4096, dtype=_np.float32) / _SAMPLE_RATE
+    input_signal = (
+        0.12 * _np.sin(2.0 * _np.pi * 220.0 * t)
+        + 0.03 * _np.sin(2.0 * _np.pi * 997.0 * t)
+    ).astype(_np.float32)
+    input_signal[0] = 0.25
+    input_signal[1024] = -0.2
+
+    with _torch.no_grad():
+        expected = (
+            model(_torch.from_numpy(input_signal), pad_start=True)
+            .detach()
+            .cpu()
+            .numpy()
+        )
+
+    with _TemporaryDirectory() as tmpdir:
+        outdir = _Path(tmpdir)
+        model_path, _ = _export(model, outdir)
+        input_path = outdir / "input.wav"
+        output_path = outdir / "output.wav"
+        np_to_wav(input_signal, input_path, rate=_SAMPLE_RATE)
+
+        result = _run_render(model_path, input_path, output_path)
+        assert result.returncode == 0, (
+            "Core render rejected the trainer's Sequential export: "
+            f"stderr={result.stderr!r} stdout={result.stdout!r}"
+        )
+
+        actual = _np.squeeze(wav_to_np(output_path))
+        assert actual.shape == expected.shape
+        assert _np.allclose(actual, expected, rtol=_RTOL, atol=_ATOL), (
+            "Sequential trainer/Core numerical mismatch: "
+            f"max |diff| = {_np.max(_np.abs(actual - expected))}"
+        )