diff --git a/app/api/canvas/local-edit/route.ts b/app/api/canvas/local-edit/route.ts
index 0e13e4003..b24303720 100644
--- a/app/api/canvas/local-edit/route.ts
+++ b/app/api/canvas/local-edit/route.ts
@@ -399,6 +399,7 @@ function compareScaleAdjustProviderCandidates(
 function resolveScaleAdjustPreferredModelId(params: {
   configuredModelId: string;
   honorRequestedModelBeforeGpt?: boolean;
+  preferMaskCapableGpt?: boolean;
   requestedModelId: string;
   models: AiModelWithProviderForSelection[];
 }) {
@@ -428,6 +429,14 @@ function resolveScaleAdjustPreferredModelId(params: {
         params.requestedModelId || params.configuredModelId
       )
     );
+  if (params.preferMaskCapableGpt) {
+    const maskCapableGptImage2 = gptImage2Candidates.filter(
+      isScaleAdjustMaskCapableModel
+    );
+    if (maskCapableGptImage2[0]) {
+      return maskCapableGptImage2[0].model.id;
+    }
+  }
   if (gptImage2Candidates[0]) {
     return gptImage2Candidates[0].model.id;
   }
@@ -652,6 +661,20 @@ function hasScaleAdjustEnlargeTarget(
   });
 }
 
+function hasScaleAdjustShrinkTarget(
+  regions: NormalizedLocalEditRegion[],
+  scalePercent?: ScaleAdjustPercent | null
+) {
+  return regions.some((region) => {
+    const targetRect = getScaleAdjustTargetRect(region, scalePercent);
+    const widthFactor =
+      region.rect.width > 0 ? targetRect.width / region.rect.width : 1;
+    const heightFactor =
+      region.rect.height > 0 ? targetRect.height / region.rect.height : 1;
+    return widthFactor < 0.92 || heightFactor < 0.92;
+  });
+}
+
 function hasScaleAdjustStructureTarget(
   regions: NormalizedLocalEditRegion[],
   scalePercent?: ScaleAdjustPercent | null
@@ -2584,6 +2607,7 @@ async function buildScaleAdjustVisualLayoutGuideBuffer(params: {
     }
 
     const shouldUseShrinkCutoutDraft =
+      process.env.CANVAS_SCALE_ADJUST_ENABLE_RMBG_SHRINK_CUTOUT === "1" &&
       !structureLockedDraft &&
       sourceRaw &&
       userId &&
@@ -3739,6 +3763,14 @@ export async function POST(request: NextRequest) {
     const isScaleAdjustOperation =
       operation === SCALE_ADJUST_OPERATION &&
       (hasScaleAdjustTargetRects || scalePercent !== null);
+    const hasScaleAdjustEnlarge = isScaleAdjustOperation
+      ? hasScaleAdjustEnlargeTarget(regions, scalePercent)
+      : false;
+    const hasScaleAdjustShrink = isScaleAdjustOperation
+      ? hasScaleAdjustShrinkTarget(regions, scalePercent)
+      : false;
+    const preferScaleAdjustMaskCapableModel =
+      hasScaleAdjustShrink && !hasScaleAdjustEnlarge;
     const displayPrompt = buildLocalEditDisplayPrompt({ operation, scalePercent });
     const resolvedAspectRatio = resolveLocalEditAspectRatio(
       body.aspectRatio,
@@ -3756,10 +3788,8 @@ export async function POST(request: NextRequest) {
     const detailFixedModel = isScaleAdjustOperation
       ? resolveScaleAdjustPreferredModelId({
           configuredModelId: configuredDetailModel,
-          honorRequestedModelBeforeGpt: hasScaleAdjustEnlargeTarget(
-            regions,
-            scalePercent
-          ),
+          honorRequestedModelBeforeGpt: hasScaleAdjustEnlarge,
+          preferMaskCapableGpt: preferScaleAdjustMaskCapableModel,
           requestedModelId: requestedModel || "",
           models: scaleAdjustModelCandidates,
         })
@@ -3800,7 +3830,9 @@ export async function POST(request: NextRequest) {
       useScaleAdjustCoordinatePrompt && !useScaleAdjustVisualLayoutGuide;
     const useScaleAdjustStructureLockedPatchWorkflow =
       isScaleAdjustOperation &&
-      hasScaleAdjustStructureTarget(regions, scalePercent);
+      hasScaleAdjustStructureTarget(regions, scalePercent) &&
+      (!preferScaleAdjustMaskCapableModel ||
+        !isScaleAdjustMaskCapableModel(resolvedScaleAdjustModelEntry));
     const useScaleAdjustEditMask =
       isScaleAdjustOperation &&
       !useScaleAdjustStructureLockedPatchWorkflow &&
@@ -4159,6 +4191,8 @@ export async function POST(request: NextRequest) {
             ? scaleAdjustPatchReference.structureLockedDraft
               ? "ai-patch-workspace-structure-locked-draft-v85-one-shot"
               : "ai-patch-workspace-draft-v73-rmbg-cutout-soft-wipe-one-shot"
+            : useScaleAdjustEditMask
+              ? "mask-edit-gpt-image-2-scale-shrink-v74-one-shot"
             : useFalScaleAdjustCoordinatePrompt
             ? "fal-safe-marked-photo-box-guide-no-old-crop-v44-one-shot"
             : useScaleAdjustVisualLayoutGuide