diff --git a/codex-rs/protocol/src/protocol.rs b/codex-rs/protocol/src/protocol.rs
index ab294ab157..bce929d214 100644
--- a/codex-rs/protocol/src/protocol.rs
+++ b/codex-rs/protocol/src/protocol.rs
@@ -796,9 +796,6 @@ pub enum Op {
         /// The raw command string after '!'
         command: String,
     },
-
-    /// Request the list of available models.
-    ListModels,
 }
 
 #[derive(Serialize, Deserialize, Clone, Copy, Debug, PartialEq, Eq, JsonSchema)]
@@ -904,7 +901,6 @@ impl Op {
             Self::ApproveGuardianDeniedAction { .. } => "approve_guardian_denied_action",
             Self::Shutdown => "shutdown",
             Self::RunUserShellCommand { .. } => "run_user_shell_command",
-            Self::ListModels => "list_models",
         }
     }
 }