diff --git a/backend/src/executors/opencode.rs b/backend/src/executors/opencode.rs
index dea666a6..9403755f 100644
--- a/backend/src/executors/opencode.rs
+++ b/backend/src/executors/opencode.rs
@@ -44,7 +44,7 @@ impl Executor for OpencodeExecutor {
 
         // Use shell command for cross-platform compatibility
         let (shell_cmd, shell_arg) = get_shell_command();
-        let opencode_command = format!("opencode -p \"{}\"", prompt.replace('"', "\\\""));
+        let opencode_command = format!("opencode -p \"{}\" --output-format=json", prompt.replace('"', "\\\""));
 
         let mut command = Command::new(shell_cmd);
         command
@@ -82,7 +82,7 @@ impl Executor for OpencodeFollowupExecutor {
 
         // Use shell command for cross-platform compatibility
         let (shell_cmd, shell_arg) = get_shell_command();
-        let opencode_command = format!("opencode -p \"{}\"", self.prompt.replace('"', "\\\""));
+        let opencode_command = format!("opencode -p \"{}\" --output-format=json", self.prompt.replace('"', "\\\""));
 
         let mut command = Command::new(shell_cmd);
         command