diff --git a/src/models.py b/src/models.py
index e87075f..a892c20 100644
--- a/src/models.py
+++ b/src/models.py
@@ -75,6 +75,7 @@ class Ticket:
  step_mode: bool = False
  retry_count: int = 0
  manual_block: bool = False
+ model_override: Optional[str] = None
 
  def mark_blocked(self, reason: str) -> None:
   self.status = "blocked"
@@ -112,6 +113,7 @@ class Ticket:
    "step_mode": self.step_mode,
    "retry_count": self.retry_count,
    "manual_block": self.manual_block,
+   "model_override": self.model_override,
   }
 
  @classmethod
@@ -130,6 +132,7 @@ class Ticket:
    step_mode=data.get("step_mode", False),
    retry_count=data.get("retry_count", 0),
    manual_block=data.get("manual_block", False),
+   model_override=data.get("model_override"),
   )
 
 
diff --git a/tests/test_per_ticket_model.py b/tests/test_per_ticket_model.py
new file mode 100644
index 0000000..5357e79
--- /dev/null
+++ b/tests/test_per_ticket_model.py
@@ -0,0 +1,22 @@
+import pytest
+from src.models import Ticket
+
+def test_ticket_has_model_override_field():
+ t = Ticket(id="T-001", description="Test")
+ assert hasattr(t, 'model_override'), "Ticket must have model_override field"
+ assert t.model_override is None, "model_override should default to None"
+
+def test_model_override_serialization():
+ t = Ticket(id="T-001", description="Test", model_override="gemini-3.1-pro-preview")
+ d = t.to_dict()
+ assert d.get('model_override') == "gemini-3.1-pro-preview", "to_dict should include model_override"
+
+def test_model_override_deserialization():
+ d = {"id": "T-001", "description": "Test", "model_override": "gemini-2.5-flash"}
+ t = Ticket.from_dict(d)
+ assert t.model_override == "gemini-2.5-flash", "from_dict should restore model_override"
+
+def test_model_override_default_on_deserialize():
+ d = {"id": "T-001", "description": "Test"}
+ t = Ticket.from_dict(d)
+ assert t.model_override is None, "Missing model_override should default to None"