diff --git a/src/components/SplitGridSettingsModal.tsx b/src/components/SplitGridSettingsModal.tsx
index c06f31fe..51230ac5 100644
--- a/src/components/SplitGridSettingsModal.tsx
+++ b/src/components/SplitGridSettingsModal.tsx
@@ -22,7 +22,8 @@ const LAYOUT_OPTIONS = [
 
 const BASE_ASPECT_RATIOS: AspectRatio[] = ["1:1", "2:3", "3:2", "3:4", "4:3", "4:5", "5:4", "9:16", "16:9", "21:9"];
 const EXTENDED_ASPECT_RATIOS: AspectRatio[] = ["1:1", "1:4", "1:8", "2:3", "3:2", "3:4", "4:1", "4:3", "4:5", "5:4", "8:1", "9:16", "16:9", "21:9"];
-const RESOLUTIONS: Resolution[] = ["1K", "2K", "4K"];
+const RESOLUTIONS_PRO: Resolution[] = ["1K", "2K", "4K"];
+const RESOLUTIONS_NB2: Resolution[] = ["512", "1K", "2K", "4K"];
 const MODELS: { value: ModelType; label: string }[] = [
   { value: "nano-banana", label: "Nano Banana" },
   { value: "nano-banana-2", label: "Nano Banana 2" },
@@ -55,6 +56,7 @@ export function SplitGridSettingsModal({
   const targetCount = rows * cols;
   const isNanoBananaPro = model === "nano-banana-pro" || model === "nano-banana-2";
   const aspectRatios = model === "nano-banana-2" ? EXTENDED_ASPECT_RATIOS : BASE_ASPECT_RATIOS;
+  const resolutions = model === "nano-banana-2" ? RESOLUTIONS_NB2 : RESOLUTIONS_PRO;
 
   const handleCreate = useCallback(() => {
     const splitNode = getNodeById(nodeId);
@@ -267,7 +269,20 @@ export function SplitGridSettingsModal({
                 </label>
                 <select
                   value={model}
-                  onChange={(e) => setModel(e.target.value as ModelType)}
+                  onChange={(e) => {
+                    const newModel = e.target.value as ModelType;
+                    setModel(newModel);
+                    // Normalize aspect ratio for the new model's allowed set
+                    const newAspectRatios = newModel === "nano-banana-2" ? EXTENDED_ASPECT_RATIOS : BASE_ASPECT_RATIOS;
+                    if (!newAspectRatios.includes(aspectRatio)) {
+                      setAspectRatio(newAspectRatios[0]);
+                    }
+                    // Normalize resolution for the new model's allowed set
+                    const newResolutions = newModel === "nano-banana-2" ? RESOLUTIONS_NB2 : RESOLUTIONS_PRO;
+                    if (!newResolutions.includes(resolution)) {
+                      setResolution(newResolutions[0]);
+                    }
+                  }}
                   className="w-full px-3 py-2 bg-neutral-900 border border-neutral-600 rounded text-neutral-100 text-sm focus:outline-none focus:border-neutral-500"
                 >
                   {MODELS.map((m) => (
@@ -302,7 +317,7 @@ export function SplitGridSettingsModal({
                       onChange={(e) => setResolution(e.target.value as Resolution)}
                       className="w-full px-3 py-2 bg-neutral-900 border border-neutral-600 rounded text-neutral-100 text-sm focus:outline-none focus:border-neutral-500"
                     >
-                      {RESOLUTIONS.map((res) => (
+                      {resolutions.map((res) => (
                         <option key={res} value={res}>{res}</option>
                       ))}
                     </select>
diff --git a/src/components/nodes/GenerateImageNode.tsx b/src/components/nodes/GenerateImageNode.tsx
index b767e764..57838d49 100644
--- a/src/components/nodes/GenerateImageNode.tsx
+++ b/src/components/nodes/GenerateImageNode.tsx
@@ -20,8 +20,9 @@ const BASE_ASPECT_RATIOS: AspectRatio[] = ["1:1", "2:3", "3:2", "3:4", "4:3", "4
 // Extended 14 aspect ratios (Nano Banana 2 adds extreme ratios)
 const EXTENDED_ASPECT_RATIOS: AspectRatio[] = ["1:1", "1:4", "1:8", "2:3", "3:2", "3:4", "4:1", "4:3", "4:5", "5:4", "8:1", "9:16", "16:9", "21:9"];
 
-// Resolutions for Nano Banana Pro and Nano Banana 2
-const RESOLUTIONS: Resolution[] = ["512", "1K", "2K", "4K"];
+// Resolutions per model (nano-banana-pro: 1K-4K, nano-banana-2: 512-4K)
+const RESOLUTIONS_PRO: Resolution[] = ["1K", "2K", "4K"];
+const RESOLUTIONS_NB2: Resolution[] = ["512", "1K", "2K", "4K"];
 
 // Hardcoded Gemini image models (always available)
 const GEMINI_IMAGE_MODELS: { value: ModelType; label: string }[] = [
@@ -407,6 +408,7 @@ export function GenerateImageNode({ id, data, selected }: NodeProps<NanoBananaNo
   const currentModelId = isGeminiProvider ? (nodeData.selectedModel?.modelId || nodeData.model) : null;
   const supportsResolution = currentModelId === "nano-banana-pro" || currentModelId === "nano-banana-2";
   const aspectRatios = currentModelId === "nano-banana-2" ? EXTENDED_ASPECT_RATIOS : BASE_ASPECT_RATIOS;
+  const resolutions = currentModelId === "nano-banana-2" ? RESOLUTIONS_NB2 : RESOLUTIONS_PRO;
   const hasCarouselImages = (nodeData.imageHistory || []).length > 1;
 
   // Track previous status to detect error transitions
@@ -714,7 +716,7 @@ export function GenerateImageNode({ id, data, selected }: NodeProps<NanoBananaNo
                 onChange={handleResolutionChange}
                 className="w-12 text-[10px] py-1 px-1.5 border border-neutral-700 rounded bg-neutral-900/50 focus:outline-none focus:ring-1 focus:ring-neutral-600 text-neutral-300"
               >
-                {RESOLUTIONS.map((res) => (
+                {resolutions.map((res) => (
                   <option key={res} value={res}>
                     {res}
                   </option>