diff --git a/studio/backend/utils/datasets/model_mappings.py b/studio/backend/utils/datasets/model_mappings.py
index 463d26a692b..9d2c983aedd 100644
--- a/studio/backend/utils/datasets/model_mappings.py
+++ b/studio/backend/utils/datasets/model_mappings.py
@@ -487,7 +487,7 @@ def is_gpt_oss_model_name(name: str) -> bool:
     },
     "qwen3-thinking": {
         "instruction": "<|im_start|>user\n",
-        "response": "<|im_start|>assistant\n<think>\n",
+        "response": "<|im_start|>assistant\n<think>",
     },
     "qwen3": {
         "instruction": "<|im_start|>user\n",