diff --git a/loopx/capabilities/native_chat/model_settings.py b/loopx/capabilities/native_chat/model_settings.py
index f4800fca09..0e9306126b 100644
--- a/loopx/capabilities/native_chat/model_settings.py
+++ b/loopx/capabilities/native_chat/model_settings.py
@@ -112,7 +112,7 @@ def inspect_agent_model_options(controller: ChatRuntimeController, agent_id: str
     if capability is None or not capability.get("available"):
         raise agent_endpoint_error(agent_id, reason=str((capability or {}).get("unavailable_reason") or ""))
     if agent_id == "codex":
-        defaults = load_codex_chat_defaults(controller.coordination_runtime_root) if goal_id else {}
+        defaults = load_codex_chat_defaults(controller.store.root.parent) if goal_id else {}
         home = codex_profile_home(controller.codex_home, defaults)
         models = providers.codex_model_options(controller.codex_bin, codex_home=home)
         if models is None:
diff --git a/loopx/chat_runtime.py b/loopx/chat_runtime.py
index cd4c436849..c018072005 100644
--- a/loopx/chat_runtime.py
+++ b/loopx/chat_runtime.py
@@ -650,7 +650,7 @@ def open_session(
             if (agent_id == "codex" and goal_id != MANAGER_AGENT_GOAL_ID
                 and conversation_scope(selected_scope)["kind"] == "owner_goal"
                 and not (latest and (latest.get("active_turn_id") or latest.get("upstream_mode") == CODEX_GOAL_CHAT_MODE))):
-                codex_defaults = load_codex_chat_defaults(self.coordination_runtime_root)
+                codex_defaults = load_codex_chat_defaults(self.store.root.parent)
                 selected_codex_home = codex_profile_home(self.codex_home, codex_defaults)
                 if latest is not None and (latest.get("codex_chat_configuration") or {}) != codex_defaults:
                     # New defaults get a new ordinary Session. Resolve them only
diff --git a/tests/test_chat_codex_defaults.py b/tests/test_chat_codex_defaults.py
index a31a2af4bc..30f538eb9c 100644
--- a/tests/test_chat_codex_defaults.py
+++ b/tests/test_chat_codex_defaults.py
@@ -1,4 +1,5 @@
 """Configured Goal Chat defaults use native settings without retargeting work."""
+import json
 import os
 import subprocess
 import sys
@@ -98,7 +99,7 @@ def start(**kwargs):
         runtime.close()
 
 
-def runtime_fixture(tmp_path, monkeypatch):
+def runtime_fixture(tmp_path, monkeypatch, *, registry_path=None):
     base, gpt = tmp_path / ".codex-ds", tmp_path / ".codex-gpt"
     base.mkdir()
     gpt.mkdir()
@@ -106,7 +107,7 @@ def runtime_fixture(tmp_path, monkeypatch):
     monkeypatch.setenv("LOOPX_CHAT_CODEX_HOME", str(base))
     monkeypatch.setenv("LOOPX_CODEX_HOMES", str(gpt))
     root = tmp_path / "runtime"
-    runtime = ChatRuntimeController(store=ChatSessionStore(root), codex_bin="fixture")
+    runtime = ChatRuntimeController(store=ChatSessionStore(root), registry_path=registry_path, codex_bin="fixture")
     monkeypatch.setattr(runtime, "capabilities", lambda: [
         {"agent_id": "codex", "available": True, "adapter_kind": "codex_app_server"},
     ])
@@ -155,6 +156,52 @@ def test_model_effort_and_speed_are_separate_and_reversible_defaults(tmp_path, m
         runtime.close()
 
 
+def test_goal_codex_defaults_follow_chat_settings_when_coordination_uses_a_separate_root(tmp_path, monkeypatch):
+    from loopx import chat_providers
+
+    coordination = tmp_path / "coordination"
+    registry = tmp_path / "registry.json"
+    registry.write_text(
+        json.dumps({"common_runtime_root": str(coordination), "goals": []}), encoding="utf-8"
+    )
+    runtime, root, base, gpt, calls = runtime_fixture(tmp_path, monkeypatch, registry_path=registry)
+    # These are two different valid stores, so a mistaken fallback also fails
+    # the test when both contain preferences.
+    configure(coordination, model="other-model", reasoning_effort="low", service_tier="flex")
+    original_coordination = read_machine_configuration(
+        coordination, registry=build_builtin_machine_configuration_registry()
+    )
+    configure(root, codex_profile="codex-gpt", model="gpt-6.1-sol", reasoning_effort="high", service_tier="fast")
+    discovered = []
+
+    def catalog(_binary, *, codex_home):
+        discovered.append(codex_home)
+        return {"options": [{"value": "gpt-6.1-sol", "reasoning_efforts": ["high"]}]}
+
+    monkeypatch.setattr(chat_providers, "codex_model_options", catalog)
+    open_args = dict(goal_id="fixture", agent_id="codex", work_dir=tmp_path, objective="Inspect.")
+    try:
+        assert runtime.coordination_runtime_root == coordination
+        runtime.inspect_agent_model_options("codex", work_dir=tmp_path, goal_id="fixture")
+        selected, reused = runtime.open_session(**open_args, mode="new")
+        assert not reused and discovered == [gpt]
+        assert calls[-1]["codex_home_override"] == gpt
+        assert (selected["agent_model_id"], selected["agent_reasoning_effort"], selected["agent_service_tier"]) == (
+            "gpt-6.1-sol", "high", "fast"
+        )
+        configure(root)
+        runtime.inspect_agent_model_options("codex", work_dir=tmp_path, goal_id="fixture")
+        cleared, _ = runtime.open_session(**open_args, mode="new")
+        assert discovered == [gpt, base]
+        assert cleared["agent_model_id"] == "inherited-model"
+        assert runtime.store.load_session(selected["session_id"])["codex_home"] == str(gpt)
+        assert read_machine_configuration(
+            coordination, registry=build_builtin_machine_configuration_registry()
+        ) == original_coordination
+    finally:
+        runtime.close()
+
+
 def test_new_defaults_do_not_replace_an_active_turn_or_its_native_home(tmp_path, monkeypatch):
     runtime, root, base, _gpt, calls = runtime_fixture(tmp_path, monkeypatch)
     args = dict(goal_id="fixture", agent_id="codex", work_dir=tmp_path, objective="Inspect.")