diff --git a/backend/src/plugins/translate/executor.py b/backend/src/plugins/translate/executor.py
index 4cd434dc..252ca9be 100644
--- a/backend/src/plugins/translate/executor.py
+++ b/backend/src/plugins/translate/executor.py
@@ -971,10 +971,15 @@ class TranslationExecutor:
 
             choices = data.get("choices", [])
             if not choices:
+                logger.explore("LLM returned no choices", extra={"src": "executor", "response_keys": list(data.keys()), "response_preview": str(data)[:2000]})
                 raise ValueError("LLM returned no choices")
 
-            content = choices[0].get("message", {}).get("content", "")
+            finish_reason = choices[0].get("finish_reason", "none")
+            msg = choices[0].get("message", {})
+            content = msg.get("content", "")
+            logger.reason(f"LLM response finish_reason={finish_reason} content_len={len(content)} msg_keys={list(msg.keys())}")
             if not content:
+                logger.explore("LLM returned empty content", extra={"src": "executor", "finish_reason": finish_reason, "msg_keys": list(msg.keys()), "response_preview": str(data)[:2000]})
                 raise ValueError("LLM returned empty content")
 
             return content
diff --git a/backend/src/plugins/translate/preview.py b/backend/src/plugins/translate/preview.py
index 21205ddf..1ecc37e7 100644
--- a/backend/src/plugins/translate/preview.py
+++ b/backend/src/plugins/translate/preview.py
@@ -977,10 +977,15 @@ class TranslationPreview:
 
             choices = data.get("choices", [])
             if not choices:
+                logger.explore("LLM returned no choices", extra={"src": "preview", "response_keys": list(data.keys()), "response_preview": str(data)[:2000]})
                 raise ValueError("LLM returned no choices")
 
-            content = choices[0].get("message", {}).get("content", "")
+            finish_reason = choices[0].get("finish_reason", "none")
+            msg = choices[0].get("message", {})
+            content = msg.get("content", "")
+            logger.reason(f"LLM response finish_reason={finish_reason} content_len={len(content)} msg_keys={list(msg.keys())}")
             if not content:
+                logger.explore("LLM returned empty content", extra={"src": "preview", "finish_reason": finish_reason, "msg_keys": list(msg.keys()), "response_preview": str(data)[:2000]})
                 raise ValueError("LLM returned empty content")
 
             return content