diff --git a/tritonbench/operators/addmm/operator.py b/tritonbench/operators/addmm/operator.py
index b1f51a102..ca245bef1 100644
--- a/tritonbench/operators/addmm/operator.py
+++ b/tritonbench/operators/addmm/operator.py
@@ -157,6 +157,68 @@ def flops(
         flops = (2 * m * k * n) + (m * n)
         return flops
 
+    @register_metric()
+    def op_gflops(
+        self, fn_name: str, example_inputs: Any, metrics: BenchmarkOperatorMetrics
+    ) -> float:
+        """Report the raw number of GFLOPS (not GFLOPS/sec) for the addmm operation."""
+        _, mat1, mat2 = example_inputs
+        m, k = mat1.size()
+        k, n = mat2.size()
+        flops = (2 * m * k * n) + (m * n)
+        # Convert FLOPS to GFLOPS (divide by 10^9)
+        gflops = flops / 1e9
+        return gflops
+
+    @register_metric()
+    def op_gbytes(
+        self, fn_name: str, example_inputs: Any, metrics: BenchmarkOperatorMetrics
+    ) -> float:
+        """Report the raw number of gigabytes of I/O (not GB/sec) for the addmm operation."""
+        a, mat1, mat2 = example_inputs
+        numel = (
+            a.numel()
+            + mat1.numel()
+            + mat2.numel()
+            + (torch.addmm(a, mat1, mat2).numel())
+        )
+        # Convert bytes to gigabytes (divide by 1e9)
+        gbytes = numel * a.element_size() / 1e9
+        return gbytes
+
+    @register_metric()
+    def grid_size(
+        self, fn_name: str, example_inputs: Any, metrics: BenchmarkOperatorMetrics
+    ) -> float:
+        """Report the total grid size (number of thread blocks) for the addmm operation."""
+        _, mat1, mat2 = example_inputs
+        m, k = mat1.size()
+        k, n = mat2.size()
+
+        # Automatically ensure best_config is in required_metrics
+        if "best_config" not in self.required_metrics:
+            self.required_metrics.append("best_config")
+
+        # Return None if best_config is not available (e.g., for baseline implementations)
+        if metrics.best_config is None:
+            return None
+
+        # Extract actual block sizes from the best configuration
+        config = metrics.best_config
+        BLOCK_M = config.get("BLOCK_M")
+        BLOCK_N = config.get("BLOCK_N")
+
+        # Return None if block sizes are not available in the config
+        if BLOCK_M is None or BLOCK_N is None:
+            return None
+
+        # Calculate grid size using triton.cdiv for consistency with hstu.py
+        grid_m = triton.cdiv(m, BLOCK_M)
+        grid_n = triton.cdiv(n, BLOCK_N)
+        total_grid_size = grid_m * grid_n
+
+        return float(total_grid_size)
+
     @register_x_val(label="(M, N, K)")
     def get_x_val(self, example_inputs) -> Tuple[int, int, int]:
         # x-value: computation intensity