diff --git a/modules/api/gpu.py b/modules/api/gpu.py
index fac3ef23e..bdcffde81 100644
--- a/modules/api/gpu.py
+++ b/modules/api/gpu.py
@@ -42,7 +42,7 @@ Resut should always be: list[ResGPU]
 class ResGPU(BaseModel):
     name: str = Field(title="GPU Name")
     data: dict = Field(title="Name/Value data")
-    chart: list[float, float] = Field(title="Exactly two items to place on chart")
+    chart: tuple[float, float] = Field(title="Exactly two items to place on chart")
 """
 
 if __name__ == '__main__':
diff --git a/modules/api/models.py b/modules/api/models.py
index dd8eb1b87..aa2bb197d 100644
--- a/modules/api/models.py
+++ b/modules/api/models.py
@@ -499,7 +499,7 @@ class ResScripts(BaseModel):
 class ResGPU(BaseModel): # definition of http response
     name: str = Field(title="GPU Name", description="GPU device name")
     data: dict = Field(title="Name/Value data", description="Key-value pairs of GPU metrics (utilization, temperature, clocks, memory, etc.)")
-    chart: list[float, float] = Field(title="Exactly two items to place on chart", description="Two numeric values for chart display (e.g., GPU utilization %, VRAM usage %)")
+    chart: tuple[float, float] = Field(title="Exactly two items to place on chart", description="Two numeric values for chart display (e.g., GPU utilization %, VRAM usage %)")
 
 class ItemLoadedModel(BaseModel):
     name: str = Field(title="Model Name", description="Model or component name")
diff --git a/modules/api/nvml.py b/modules/api/nvml.py
index 0dec562be..7a040696e 100644
--- a/modules/api/nvml.py
+++ b/modules/api/nvml.py
@@ -72,7 +72,7 @@ def get_nvml():
                 "System load": f'GPU {load.gpu}% | VRAM {load.memory}% | Temp {pynvml.nvmlDeviceGetTemperature(dev, 0)}C | Fan {pynvml.nvmlDeviceGetFanSpeed(dev)}%',
                 'State': get_reason(pynvml.nvmlDeviceGetCurrentClocksThrottleReasons(dev)),
             }
-            chart = [load.memory, load.gpu]
+            chart = (load.memory, load.gpu)
             devices.append({
                 'name': name,
                 'data': data,
diff --git a/modules/api/rocm_smi.py b/modules/api/rocm_smi.py
index e7b9a2f74..fd95fa316 100644
--- a/modules/api/rocm_smi.py
+++ b/modules/api/rocm_smi.py
@@ -96,7 +96,7 @@ def get_rocm_smi():
                 'Throttle reason': str(ThrottleStatus(int(rocm_smi_data[key].get("throttle_status", 0)))),
             }
             name = rocm_smi_data[key].get('Device Name', 'unknown')
-            chart = [load["memory"], load["gpu"]]
+            chart = (load["memory"], load["gpu"])
             devices.append({
                 'name': name,
                 'data': data,
diff --git a/modules/api/xpu_smi.py b/modules/api/xpu_smi.py
index 70401b84d..56c614781 100644
--- a/modules/api/xpu_smi.py
+++ b/modules/api/xpu_smi.py
@@ -29,7 +29,7 @@ def get_xpu_smi():
             "VRAM usage": f'{round(100 * load["memory"] / total)}% | {load["memory"]} MB used | {total - load["memory"]} MB free | {total} MB total',
             "RAM usage": f'{round(100 * ram["used"] / ram["total"])}% | {round(1024 * ram["used"])} MB used | {round(1024 * ram["free"])} MB free | {round(1024 * ram["total"])} MB total',
         }
-        chart = [load["memory"], load["gpu"]]
+        chart = (load["memory"], load["gpu"])
         devices.append({
             'name': torch.xpu.get_device_name(),
             'data': data,