diff --git a/go/internal/distill/engine.go b/go/internal/distill/engine.go
index ee9ff72..2a3c1db 100644
--- a/go/internal/distill/engine.go
+++ b/go/internal/distill/engine.go
@@ -256,7 +256,8 @@ func (e *Engine) callLLM5D(content string) (FiveDScore, error) {
 	var result struct {
 		Choices []struct {
 			Message struct {
-				Content string `json:"content"`
+				Content          string `json:"content"`
+				ReasoningContent string `json:"reasoning_content"`
 			} `json:"message"`
 		} `json:"choices"`
 	}
@@ -270,7 +271,11 @@ func (e *Engine) callLLM5D(content string) (FiveDScore, error) {
 	}
 
 	var score FiveDScore
-	json.Unmarshal([]byte(result.Choices[0].Message.Content), &score)
+	llmContent := result.Choices[0].Message.Content
+	if llmContent == "" {
+		llmContent = result.Choices[0].Message.ReasoningContent
+	}
+	json.Unmarshal([]byte(llmContent), &score)
 	return score, nil
 }