diff --git a/bench-vllm-qwen36-fp8.sh b/bench-vllm-qwen36-fp8.sh
--- a/bench-vllm-qwen36-fp8.sh
+++ b/bench-vllm-qwen36-fp8.sh
@@ -15,6 +15,7 @@ WARMUP_ITERS="${WARMUP_ITERS:-1}"
 KV_CACHE_DTYPE="${KV_CACHE_DTYPE:-auto}"
 QUANTIZATION="${QUANTIZATION:-fp8}"
+SPECULATIVE_CONFIG="${SPECULATIVE_CONFIG:-}"
 EXTRA_ARGS="${EXTRA_ARGS:-}"
@@ -37,6 +38,11 @@ if [[ -n "$QUANTIZATION" && "$QUANTIZATION" != "none" && "$QUANTIZATION" !=
   quant_args=(--quantization "$QUANTIZATION")
 fi
 
+spec_args=()
+if [[ -n "$SPECULATIVE_CONFIG" ]]; then
+  spec_args=(--speculative-config "$SPECULATIVE_CONFIG")
+fi
+
 "$VENV/bin/vllm" bench latency \
@@ -59,6 +65,7 @@ "$VENV/bin/vllm" bench latency \
   --batch-size "$BATCH_SIZE" \
   --num-iters "$NUM_ITERS" \
   --num-iters-warmup "$WARMUP_ITERS" \
+  "${spec_args[@]}" \
   --output-json "$json" \
   $EXTRA_ARGS \
   >"$log" 2>&1