diff --git a/backend/src/common/base_dto.py b/backend/src/common/base_dto.py
index 78b047f0..1832b9e8 100644
--- a/backend/src/common/base_dto.py
+++ b/backend/src/common/base_dto.py
@@ -68,10 +68,6 @@ class GenerationModelEnum(str, Enum):
     VTO = "virtual-try-on-001"
 
     # Video-Specific Models
-    VEO_3_1_FAST_GENERATE_001 = "veo-3.1-fast-generate-001"
-    VEO_3_1_LITE_GENERATE_001 = "veo-3.1-lite-generate-001"
-    VEO_3_1_GENERATE_001 = "veo-3.1-generate-001"
-    VEO_3_1_PREVIEW = "veo-3.1-generate-preview"
     VEO_3_FAST = "veo-3.0-fast-generate-001"
     VEO_3_QUALITY = "veo-3.0-generate-001"
     VEO_3_FAST_PREVIEW = "veo-3.0-fast-generate-preview"
diff --git a/backend/src/videos/dto/create_veo_dto.py b/backend/src/videos/dto/create_veo_dto.py
index 71406be7..0bd7aa40 100644
--- a/backend/src/videos/dto/create_veo_dto.py
+++ b/backend/src/videos/dto/create_veo_dto.py
@@ -56,7 +56,7 @@ class CreateVeoDto(BaseDto):
         description="The ID of the workspace for this generation.",
     )
     generation_model: GenerationModelEnum = Field(
-        default=GenerationModelEnum.VEO_3_1_GENERATE_001,
+        default=GenerationModelEnum.VEO_3_QUALITY,
         description="Model used for image generation.",
     )
     aspect_ratio: AspectRatioEnum = Field(
@@ -167,17 +167,10 @@ def validate_cross_fields(self) -> "CreateVeoDto":
         if has_any_references:
             if (
                 model != GenerationModelEnum.VEO_2_GENERATE_EXP
-                and model != GenerationModelEnum.VEO_3_1_PREVIEW
-                and model != GenerationModelEnum.VEO_3_1_GENERATE_001
-                and model != GenerationModelEnum.VEO_3_1_LITE_GENERATE_001
-                and model != GenerationModelEnum.VEO_3_1_FAST_GENERATE_001
             ):
                 raise ValueError(
                     "Reference images are only supported by the "
-                    f"'{GenerationModelEnum.VEO_3_1_PREVIEW.value}' model, "
-                    f"'{GenerationModelEnum.VEO_3_1_GENERATE_001.value}' model, "
-                    f"'{GenerationModelEnum.VEO_3_1_LITE_GENERATE_001.value}' model, or "
-                    f"'{GenerationModelEnum.VEO_3_1_FAST_GENERATE_001.value}' model.",
+                    f"'{GenerationModelEnum.VEO_2_GENERATE_EXP.value}' model.",
                 )
 
             start_image_present = bool(self.start_image_asset_id)
@@ -218,10 +211,6 @@ def validate_video_generation_model(
     ) -> GenerationModelEnum:
         """Ensures that only supported generation models for video are used."""
         valid_video_ratios = [
-            GenerationModelEnum.VEO_3_1_PREVIEW,
-            GenerationModelEnum.VEO_3_1_GENERATE_001,
-            GenerationModelEnum.VEO_3_1_LITE_GENERATE_001,
-            GenerationModelEnum.VEO_3_1_FAST_GENERATE_001,
             GenerationModelEnum.VEO_3_FAST,
             GenerationModelEnum.VEO_3_QUALITY,
             GenerationModelEnum.VEO_3_FAST_PREVIEW,