diff --git a/scripts/benchmark-models.sh b/scripts/benchmark-models.sh
index 323331a..6ecb315 100755
--- a/scripts/benchmark-models.sh
+++ b/scripts/benchmark-models.sh
@@ -48,7 +48,7 @@ for file in "$SIMPLE_FILE" "$COMPLEX_FILE"; do
 
       start_time=$(date +%s)
       cd "$ROOT"
-      claude -p --model "${MODELS[$model_name]}" --dangerously-skip-permissions "$prompt" > "$outfile" 2>&1 || true
+      claude -p --model "${MODELS[$model_name]}" --output-format text --dangerously-skip-permissions "$prompt" > "$outfile" 2>&1 || true
       end_time=$(date +%s)
 
       elapsed=$((end_time - start_time))