diff --git a/CHANGELOG.md b/CHANGELOG.md
index 41d4153e0..17ba58a3e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -55,6 +55,7 @@
 - **API**
   - Add `/sdapi/v1/lora?lora=<lora_name>` endpoint that returns full lora info and metadata  
   - Add `/sdapi/v1/controlnets?model_type=<model_type|all|None>` endpoints that returns list of available controlnets for specific model type  
+  - Set default sampler to `Default`  
 - **Fixes**  
   - IPEX with DPM2++ FlowMatch samplers  
   - Invalid attention processor with ControlNet  
diff --git a/modules/api/control.py b/modules/api/control.py
index 9d6512cd2..9e06d874a 100644
--- a/modules/api/control.py
+++ b/modules/api/control.py
@@ -22,7 +22,7 @@ ReqControl = models.create_model_from_signature(
     func = run.control_run,
     model_name = "StableDiffusionProcessingControl",
     additional_fields = [
-        {"key": "sampler_name", "type": str, "default": "UniPC"},
+        {"key": "sampler_name", "type": str, "default": "Default"},
         {"key": "script_name", "type": Optional[str], "default": None},
         {"key": "script_args", "type": list, "default": []},
         {"key": "send_images", "type": bool, "default": True},
diff --git a/modules/api/models.py b/modules/api/models.py
index f463a2dd6..a19c59858 100644
--- a/modules/api/models.py
+++ b/modules/api/models.py
@@ -198,7 +198,7 @@ ReqTxt2Img = PydanticModelGenerator(
     StableDiffusionProcessingTxt2Img,
     [
         {"key": "sampler_index", "type": Union[int, str], "default": 0},
-        {"key": "sampler_name", "type": str, "default": "UniPC"},
+        {"key": "sampler_name", "type": str, "default": "Default"},
         {"key": "hr_sampler_name", "type": str, "default": "Same as primary"},
         {"key": "script_name", "type": Optional[str], "default": "none"},
         {"key": "script_args", "type": list, "default": []},
diff --git a/modules/processing_class.py b/modules/processing_class.py
index fc697d997..98e8d1c96 100644
--- a/modules/processing_class.py
+++ b/modules/processing_class.py
@@ -463,8 +463,8 @@ class StableDiffusionProcessingImg2Img(StableDiffusionProcessing):
         if all_subseeds is not None:
             self.all_subseeds = all_subseeds
 
-        if self.sampler_name == "PLMS":
-            self.sampler_name = 'UniPC'
+        if self.sampler_name == 'PLMS':
+            self.sampler_name = 'Default'
         if not shared.native:
             self.sampler = sd_samplers.create_sampler(self.sampler_name, self.sd_model)
             if hasattr(self.sampler, "initialize"):
diff --git a/modules/processing_helpers.py b/modules/processing_helpers.py
index e31ebb028..5d1647f8f 100644
--- a/modules/processing_helpers.py
+++ b/modules/processing_helpers.py
@@ -97,10 +97,10 @@ def get_sampler_name(sampler_index: int, img: bool = False) -> str:
     if len(sd_samplers.samplers) > sampler_index:
         sampler_name = sd_samplers.samplers[sampler_index].name
     else:
-        sampler_name = "UniPC"
+        sampler_name = "Default"
         shared.log.warning(f'Sampler not found: index={sampler_index} available={[s.name for s in sd_samplers.samplers]} fallback={sampler_name}')
     if img and sampler_name == "PLMS":
-        sampler_name = "UniPC"
+        sampler_name = "Default"
         shared.log.warning(f'Sampler not compatible: name=PLMS fallback={sampler_name}')
     return sampler_name