diff --git a/codex-rs/app-server/src/codex_message_processor.rs b/codex-rs/app-server/src/codex_message_processor.rs
index a5f2eb40018a..f037a9f4d69a 100644
--- a/codex-rs/app-server/src/codex_message_processor.rs
+++ b/codex-rs/app-server/src/codex_message_processor.rs
@@ -8985,6 +8985,7 @@ fn merge_persisted_resume_metadata(
     }
 
     typesafe_overrides.model = persisted_metadata.model.clone();
+    typesafe_overrides.model_provider = Some(persisted_metadata.model_provider.clone());
 
     if let Some(reasoning_effort) = persisted_metadata.reasoning_effort {
         request_overrides.get_or_insert_with(HashMap::new).insert(
@@ -10712,6 +10713,10 @@ mod tests {
             typesafe_overrides.model,
             Some("gpt-5.1-codex-max".to_string())
         );
+        assert_eq!(
+            typesafe_overrides.model_provider,
+            Some("mock_provider".to_string())
+        );
         assert_eq!(
             request_overrides,
             Some(HashMap::from([(
@@ -10742,6 +10747,7 @@ mod tests {
         );
 
         assert_eq!(typesafe_overrides.model, Some("gpt-5.2-codex".to_string()));
+        assert_eq!(typesafe_overrides.model_provider, None);
         assert_eq!(
             request_overrides,
             Some(HashMap::from([(
@@ -10770,6 +10776,7 @@ mod tests {
         );
 
         assert_eq!(typesafe_overrides.model, None);
+        assert_eq!(typesafe_overrides.model_provider, None);
         assert_eq!(
             request_overrides,
             Some(HashMap::from([(
@@ -10821,6 +10828,7 @@ mod tests {
         );
 
         assert_eq!(typesafe_overrides.model, None);
+        assert_eq!(typesafe_overrides.model_provider, None);
         assert_eq!(
             request_overrides,
             Some(HashMap::from([(
@@ -10845,6 +10853,10 @@ mod tests {
         );
 
         assert_eq!(typesafe_overrides.model, None);
+        assert_eq!(
+            typesafe_overrides.model_provider,
+            Some("mock_provider".to_string())
+        );
         assert_eq!(request_overrides, None);
         Ok(())
     }