diff --git a/dpgen2/superop/prep_run_calypso.py b/dpgen2/superop/prep_run_calypso.py
index daa48143..998adec8 100644
--- a/dpgen2/superop/prep_run_calypso.py
+++ b/dpgen2/superop/prep_run_calypso.py
@@ -290,7 +290,7 @@ def _prep_run_caly(
         key="%s--run-caly-model-devi-{{item}}"
         % (prep_run_caly_steps.inputs.parameters["block_id"],),
         executor=run_executor,
-        **prep_config,
+        **run_config,
     )
     prep_run_caly_steps.add(run_caly_model_devi)
 
diff --git a/tests/test_prep_run_caly.py b/tests/test_prep_run_caly.py
index e949410d..f303e0f5 100644
--- a/tests/test_prep_run_caly.py
+++ b/tests/test_prep_run_caly.py
@@ -4,9 +4,15 @@
 import shutil
 import time
 import unittest
+from collections import (
+    defaultdict,
+)
 from pathlib import (
     Path,
 )
+from types import (
+    SimpleNamespace,
+)
 from typing import (
     List,
     Set,
@@ -36,6 +42,10 @@
     OPIOSign,
     PythonOPTemplate,
 )
+from mock import (
+    Mock,
+    patch,
+)
 
 from dpgen2.constants import (
     calypso_check_opt_file,
@@ -89,6 +99,7 @@
 )
 from dpgen2.superop.prep_run_calypso import (
     PrepRunCaly,
+    _prep_run_caly,
 )
 from dpgen2.utils.step_config import normalize as normalize_step_dict
 
@@ -101,6 +112,99 @@
 )
 
 
+class TestPrepRunCalyConfiguration(unittest.TestCase):
+    def test_model_deviation_step_uses_run_config(self):
+        """Route every step-level control from the intended phase config."""
+        step_config_keys = (
+            "continue_on_failed",
+            "continue_on_num_success",
+            "continue_on_success_ratio",
+            "parallelism",
+        )
+
+        def make_mapping():
+            return defaultdict(Mock)
+
+        prep_config = normalize_step_dict(
+            {
+                "continue_on_failed": False,
+                "continue_on_num_success": 1,
+                "continue_on_success_ratio": 0.1,
+                "parallelism": 3,
+            }
+        )
+        run_config = normalize_step_dict(
+            {
+                "continue_on_failed": True,
+                "continue_on_num_success": 9,
+                "continue_on_success_ratio": 0.9,
+                "parallelism": 7,
+            }
+        )
+
+        for expl_mode in ("default", "merge"):
+            with self.subTest(expl_mode=expl_mode):
+                step_calls = []
+
+                def make_step(name, *args, **kwargs):
+                    step_calls.append((name, kwargs))
+                    return SimpleNamespace(
+                        outputs=SimpleNamespace(
+                            parameters=make_mapping(),
+                            artifacts=make_mapping(),
+                        )
+                    )
+
+                prep_run_steps = SimpleNamespace(
+                    inputs=SimpleNamespace(
+                        parameters=make_mapping(),
+                        artifacts=make_mapping(),
+                    ),
+                    outputs=SimpleNamespace(artifacts=make_mapping()),
+                    add=Mock(),
+                )
+
+                with (
+                    patch(
+                        "dpgen2.superop.prep_run_calypso.Step",
+                        side_effect=make_step,
+                    ),
+                    patch("dpgen2.superop.prep_run_calypso.PythonOPTemplate"),
+                    patch("dpgen2.superop.prep_run_calypso.Slices"),
+                    patch("dpgen2.superop.prep_run_calypso.argo_range"),
+                    patch(
+                        "dpgen2.superop.prep_run_calypso.init_executor",
+                        side_effect=lambda value: value,
+                    ),
+                ):
+                    _prep_run_caly(
+                        prep_run_steps,
+                        defaultdict(str),
+                        Mock(),
+                        Mock(),
+                        Mock(),
+                        Mock(),
+                        expl_mode=expl_mode,
+                        prep_config=prep_config,
+                        run_config=run_config,
+                    )
+
+                calls_by_name = dict(step_calls)
+                expected_configs = {
+                    "prep-caly-input": prep_config,
+                    "caly-evo-step": (
+                        prep_config if expl_mode == "default" else run_config
+                    ),
+                    "run-caly-model-devi": run_config,
+                }
+                for step_name, expected_config in expected_configs.items():
+                    actual_kwargs = calls_by_name[step_name]
+                    self.assertEqual(
+                        {key: actual_kwargs[key] for key in step_config_keys},
+                        {key: expected_config[key] for key in step_config_keys},
+                    )
+
+
 def make_task_group_list(njobs):
     tgrp = BaseExplorationTaskGroup()
     for ii in range(njobs):