diff --git a/invokeai/frontend/web/src/features/parameters/components/Parameters/Canvas/BoundingBox/ParamBoundingBoxHeight.tsx b/invokeai/frontend/web/src/features/parameters/components/Parameters/Canvas/BoundingBox/ParamBoundingBoxHeight.tsx
index 1e2ef833e8..1711c9344a 100644
--- a/invokeai/frontend/web/src/features/parameters/components/Parameters/Canvas/BoundingBox/ParamBoundingBoxHeight.tsx
+++ b/invokeai/frontend/web/src/features/parameters/components/Parameters/Canvas/BoundingBox/ParamBoundingBoxHeight.tsx
@@ -14,8 +14,9 @@ const selector = createSelector(
   [stateSelector, isStagingSelector],
   ({ canvas, generation }, isStaging) => {
     const { boundingBoxDimensions } = canvas;
-    const { aspectRatio } = generation;
+    const { model, aspectRatio } = generation;
     return {
+      model,
       boundingBoxDimensions,
       isStaging,
       aspectRatio,
@@ -26,11 +27,15 @@ const selector = createSelector(
 
 const ParamBoundingBoxWidth = () => {
   const dispatch = useAppDispatch();
-  const { boundingBoxDimensions, isStaging, aspectRatio } =
+  const { model, boundingBoxDimensions, isStaging, aspectRatio } =
     useAppSelector(selector);
 
   const { t } = useTranslation();
 
+  const initial = ['sdxl', 'sdxl-refiner'].includes(model?.base_model as string)
+    ? 1024
+    : 512;
+
   const handleChangeHeight = (v: number) => {
     dispatch(
       setBoundingBoxDimensions({
@@ -53,15 +58,15 @@ const ParamBoundingBoxWidth = () => {
     dispatch(
       setBoundingBoxDimensions({
         ...boundingBoxDimensions,
-        height: Math.floor(512),
+        height: Math.floor(initial),
       })
     );
     if (aspectRatio) {
-      const newWidth = roundToMultiple(512 * aspectRatio, 64);
+      const newWidth = roundToMultiple(initial * aspectRatio, 64);
       dispatch(
         setBoundingBoxDimensions({
           width: newWidth,
-          height: Math.floor(512),
+          height: Math.floor(initial),
         })
       );
     }
diff --git a/invokeai/frontend/web/src/features/parameters/components/Parameters/Canvas/BoundingBox/ParamBoundingBoxWidth.tsx b/invokeai/frontend/web/src/features/parameters/components/Parameters/Canvas/BoundingBox/ParamBoundingBoxWidth.tsx
index 0a75754074..a70d5b33ca 100644
--- a/invokeai/frontend/web/src/features/parameters/components/Parameters/Canvas/BoundingBox/ParamBoundingBoxWidth.tsx
+++ b/invokeai/frontend/web/src/features/parameters/components/Parameters/Canvas/BoundingBox/ParamBoundingBoxWidth.tsx
@@ -14,8 +14,9 @@ const selector = createSelector(
   [stateSelector, isStagingSelector],
   ({ canvas, generation }, isStaging) => {
     const { boundingBoxDimensions } = canvas;
-    const { aspectRatio } = generation;
+    const { model, aspectRatio } = generation;
     return {
+      model,
       boundingBoxDimensions,
       isStaging,
       aspectRatio,
@@ -26,9 +27,13 @@ const selector = createSelector(
 
 const ParamBoundingBoxWidth = () => {
   const dispatch = useAppDispatch();
-  const { boundingBoxDimensions, isStaging, aspectRatio } =
+  const { model, boundingBoxDimensions, isStaging, aspectRatio } =
     useAppSelector(selector);
 
+  const initial = ['sdxl', 'sdxl-refiner'].includes(model?.base_model as string)
+    ? 1024
+    : 512;
+
   const { t } = useTranslation();
 
   const handleChangeWidth = (v: number) => {
@@ -53,14 +58,14 @@ const ParamBoundingBoxWidth = () => {
     dispatch(
       setBoundingBoxDimensions({
         ...boundingBoxDimensions,
-        width: Math.floor(512),
+        width: Math.floor(initial),
       })
     );
     if (aspectRatio) {
-      const newHeight = roundToMultiple(512 / aspectRatio, 64);
+      const newHeight = roundToMultiple(initial / aspectRatio, 64);
       dispatch(
         setBoundingBoxDimensions({
-          width: Math.floor(512),
+          width: Math.floor(initial),
           height: newHeight,
         })
       );
diff --git a/invokeai/frontend/web/src/features/parameters/components/Parameters/Core/ParamHeight.tsx b/invokeai/frontend/web/src/features/parameters/components/Parameters/Core/ParamHeight.tsx
index 37ed43ddc0..097dec4270 100644
--- a/invokeai/frontend/web/src/features/parameters/components/Parameters/Core/ParamHeight.tsx
+++ b/invokeai/frontend/web/src/features/parameters/components/Parameters/Core/ParamHeight.tsx
@@ -11,16 +11,15 @@ import { useTranslation } from 'react-i18next';
 const selector = createSelector(
   [stateSelector],
   ({ generation, hotkeys, config }) => {
-    const { initial, min, sliderMax, inputMax, fineStep, coarseStep } =
-      config.sd.height;
-    const { height } = generation;
+    const { min, sliderMax, inputMax, fineStep, coarseStep } = config.sd.height;
+    const { model, height } = generation;
     const { aspectRatio } = generation;
 
     const step = hotkeys.shift ? fineStep : coarseStep;
 
     return {
+      model,
       height,
-      initial,
       min,
       sliderMax,
       inputMax,
@@ -37,11 +36,15 @@ type ParamHeightProps = Omit<
 >;
 
 const ParamHeight = (props: ParamHeightProps) => {
-  const { height, initial, min, sliderMax, inputMax, step, aspectRatio } =
+  const { model, height, min, sliderMax, inputMax, step, aspectRatio } =
     useAppSelector(selector);
   const dispatch = useAppDispatch();
   const { t } = useTranslation();
 
+  const initial = ['sdxl', 'sdxl-refiner'].includes(model?.base_model as string)
+    ? 1024
+    : 512;
+
   const handleChange = useCallback(
     (v: number) => {
       dispatch(setHeight(v));
diff --git a/invokeai/frontend/web/src/features/parameters/components/Parameters/Core/ParamWidth.tsx b/invokeai/frontend/web/src/features/parameters/components/Parameters/Core/ParamWidth.tsx
index 895b6cedbf..d1c763fe45 100644
--- a/invokeai/frontend/web/src/features/parameters/components/Parameters/Core/ParamWidth.tsx
+++ b/invokeai/frontend/web/src/features/parameters/components/Parameters/Core/ParamWidth.tsx
@@ -11,15 +11,14 @@ import { useTranslation } from 'react-i18next';
 const selector = createSelector(
   [stateSelector],
   ({ generation, hotkeys, config }) => {
-    const { initial, min, sliderMax, inputMax, fineStep, coarseStep } =
-      config.sd.width;
-    const { width, aspectRatio } = generation;
+    const { min, sliderMax, inputMax, fineStep, coarseStep } = config.sd.width;
+    const { model, width, aspectRatio } = generation;
 
     const step = hotkeys.shift ? fineStep : coarseStep;
 
     return {
+      model,
       width,
-      initial,
       min,
       sliderMax,
       inputMax,
@@ -33,11 +32,15 @@ const selector = createSelector(
 type ParamWidthProps = Omit<IAIFullSliderProps, 'label' | 'value' | 'onChange'>;
 
 const ParamWidth = (props: ParamWidthProps) => {
-  const { width, initial, min, sliderMax, inputMax, step, aspectRatio } =
+  const { model, width, min, sliderMax, inputMax, step, aspectRatio } =
     useAppSelector(selector);
   const dispatch = useAppDispatch();
   const { t } = useTranslation();
 
+  const initial = ['sdxl', 'sdxl-refiner'].includes(model?.base_model as string)
+    ? 1024
+    : 512;
+
   const handleChange = useCallback(
     (v: number) => {
       dispatch(setWidth(v));