diff --git a/app/(chat)/api/chat/route.ts b/app/(chat)/api/chat/route.ts
index 1b76fd207..dd0a4df20 100644
--- a/app/(chat)/api/chat/route.ts
+++ b/app/(chat)/api/chat/route.ts
@@ -644,8 +644,11 @@ type AgentVideoPlan = {
 
 function normalizeChatImageSize(value?: string | null): ChatImageSize | undefined {
   const normalized = String(value || "").trim().toUpperCase();
-  if (normalized === "1K" || normalized === "2K" || normalized === "4K") {
-    return normalized;
+  const kMatch = normalized.match(/^(\d+(?:\.\d+)?)K$/);
+  if (!kMatch?.[1]) return undefined;
+  const normalizedK = `${Number(kMatch[1]).toString()}K`;
+  if (["0.5K", "1K", "2K", "4K", "8K", "10K", "12K"].includes(normalizedK)) {
+    return normalizedK as ChatImageSize;
   }
   return undefined;
 }
diff --git a/app/(chat)/api/chat/schema.ts b/app/(chat)/api/chat/schema.ts
index 87226885c..7732b221f 100644
--- a/app/(chat)/api/chat/schema.ts
+++ b/app/(chat)/api/chat/schema.ts
@@ -33,7 +33,7 @@ const videoParamsSchema = z.object({
   returnLastFrame: z.boolean().optional(),
 }).optional();
 
-const imageSizeValues = ["1K", "2K", "4K"] as const;
+const imageSizeValues = ["0.5K", "1K", "2K", "4K", "8K", "10K", "12K"] as const;
 
 function normalizeImageSizeInput(value: unknown) {
   if (typeof value !== "string") return undefined;
diff --git a/lib/ai/providers/snapgen-image.ts b/lib/ai/providers/snapgen-image.ts
index 281a6c078..a0026c75d 100644
--- a/lib/ai/providers/snapgen-image.ts
+++ b/lib/ai/providers/snapgen-image.ts
@@ -90,6 +90,10 @@ function normalizeResolution(imageSize?: string, apiFormat?: SnapgenApiFormat) {
   return defaultResolution;
 }
 
+function toSnapgenResolutionParam(resolution: string) {
+  return resolution.trim().toLowerCase();
+}
+
 function normalizeOutputFormat(outputFormat?: string): "png" | "jpeg" {
   if (!outputFormat) return DEFAULT_OUTPUT_FORMAT;
   const normalized = outputFormat.trim().toLowerCase();
@@ -709,6 +713,7 @@ function appendGenericFields({
   imageUrls,
   aspectRatio,
   resolution,
+  resolutionParam,
   outputFormat,
 }: {
   formData: FormData;
@@ -717,12 +722,13 @@ function appendGenericFields({
   imageUrls: string[];
   aspectRatio: string;
   resolution: string;
+  resolutionParam: string;
   outputFormat: string;
 }) {
   formData.append("prompt", prompt);
   formData.append("model", getGenericEndpointModel(runtimeModelId));
   formData.append("aspect_ratio", aspectRatio);
-  formData.append("resolution", resolution);
+  formData.append("resolution", resolutionParam || toSnapgenResolutionParam(resolution));
   formData.append("output_format", outputFormat);
   for (const imageUrl of imageUrls.slice(0, 8)) {
     formData.append("file_urls", imageUrl);
@@ -743,6 +749,7 @@ async function buildRequestForm({
   imageUrls,
   aspectRatio,
   resolution,
+  resolutionParam,
   imageCount,
   outputFormat,
   quality,
@@ -753,6 +760,7 @@ async function buildRequestForm({
   imageUrls: string[];
   aspectRatio: string;
   resolution: string;
+  resolutionParam: string;
   imageCount: number;
   outputFormat: string;
   quality?: string;
@@ -778,7 +786,7 @@ async function buildRequestForm({
     case "snapgen-gpt-image-2": {
       formData.append("prompt", prompt);
       formData.append("aspect_ratio", aspectRatio);
-      formData.append("resolution", resolution);
+      formData.append("resolution", resolutionParam || toSnapgenResolutionParam(resolution));
       formData.append("mode", normalizeGptImage2Mode(quality));
       await appendReferenceFiles(formData, imageUrls);
       return formData;
@@ -792,6 +800,7 @@ async function buildRequestForm({
         imageUrls,
         aspectRatio,
         resolution,
+        resolutionParam,
         outputFormat,
       });
       return formData;
@@ -863,6 +872,7 @@ export function createSnapgenImage({ apiKey, baseURL }: SnapgenImageConfig) {
         });
         const aspectRatio = resolvedAspectRatio.aspectRatio;
         const resolution = normalizeResolution(options.imageParams?.imageSize, apiFormat);
+        const resolutionParam = toSnapgenResolutionParam(resolution);
         const outputFormat = normalizeOutputFormat(options.imageParams?.outputFormat);
         const maxImages = options.imageGenConfig?.maxImages || (apiFormat === "snapgen-grok-image" ? 8 : apiFormat === "snapgen-meta-ai-image" ? 4 : 1);
         const imageCount = clampImageCount(options.imageParams?.imageCount, maxImages);
@@ -873,6 +883,7 @@ export function createSnapgenImage({ apiKey, baseURL }: SnapgenImageConfig) {
           imageUrls,
           aspectRatio,
           resolution,
+          resolutionParam,
           imageCount,
           outputFormat,
           quality: options.imageParams?.quality,
@@ -885,7 +896,9 @@ export function createSnapgenImage({ apiKey, baseURL }: SnapgenImageConfig) {
           aspectRatio,
           aspectRatioSource: resolvedAspectRatio.aspectRatioSource,
           referenceImageSize: resolvedAspectRatio.referenceImageSize,
+          requestedImageSize: options.imageParams?.imageSize,
           resolution,
+          resolutionParam,
           imageCount,
           referenceImageCount: imageUrls.length,
         });