diff --git a/cli.py b/cli.py
index 8f3edd063..2058103d8 100755
--- a/cli.py
+++ b/cli.py
@@ -1473,9 +1473,15 @@ class HermesCLI:
         Opens a dim reasoning box on first token, streams line-by-line.
         The box is closed automatically when content tokens start arriving
         (via _stream_delta → _emit_stream_text).
+
+        Once the response box is open, suppress any further reasoning
+        rendering — a late thinking block (e.g. after an interrupt) would
+        otherwise draw a reasoning box inside the response box.
         """
         if not text:
             return
+        if getattr(self, "_stream_box_opened", False):
+            return
 
         # Open reasoning box on first reasoning token
         if not getattr(self, "_reasoning_box_opened", False):