diff --git a/packages/core/src/client/image-routes.ts b/packages/core/src/client/image-routes.ts
index 59c2895..2c532e8 100644
--- a/packages/core/src/client/image-routes.ts
+++ b/packages/core/src/client/image-routes.ts
@@ -83,12 +83,17 @@ function isSyncEditModel(model: string): boolean {
   return startsWithAny(model, SYNC_EDIT_PREFIXES);
 }
 
+/** wanx-v1 and dated aliases (e.g. wanx-v1-0521) use the legacy text2image API. */
+function isWanxV1Model(model: string): boolean {
+  return /^wanx-v1(?:-|$)/i.test(model);
+}
+
 /** wan2.5 / wan2.2 / wan2.1 / wanx text-to-image models use the legacy prompt API. */
 export function isLegacyText2ImageModel(model: string): boolean {
   if (model.startsWith("wan2.6-t2i") || model.startsWith("wan2.6-image")) return false;
   if (isSyncGenerateModel(model)) return false;
   if (/^wan2\.[0-5][^-]*-t2i/i.test(model)) return true;
-  if (/^wanx-v1$/i.test(model)) return true;
+  if (isWanxV1Model(model)) return true;
   if (/^wanx/i.test(model) && /t2i|text2image/i.test(model)) return true;
   return false;
 }
@@ -120,7 +125,7 @@ export function resolveImageSizeProfile(model: string): ImageSizeProfile {
   ) {
     return "wan26";
   }
-  if (/^wanx-v1$/i.test(model)) return "wanx-v1";
+  if (isWanxV1Model(model)) return "wanx-v1";
   if (/wan2\.5-i2i/i.test(model)) return "wan25-i2i";
   if (isLegacyText2ImageModel(model)) return "wan-legacy";
   return "wan26";
diff --git a/packages/core/tests/image-routes.test.ts b/packages/core/tests/image-routes.test.ts
index 8c82701..73e27f8 100644
--- a/packages/core/tests/image-routes.test.ts
+++ b/packages/core/tests/image-routes.test.ts
@@ -27,6 +27,7 @@ test("legacy text2image covers wan2.5/2.2/2.1 t2i and wanx but not wan2.6-t2i/im
   expect(isLegacyText2ImageModel("wan2.1-t2i-turbo")).toBe(true);
   expect(isLegacyText2ImageModel("wanx2.0-t2i-turbo")).toBe(true);
   expect(isLegacyText2ImageModel("wanx-v1")).toBe(true);
+  expect(isLegacyText2ImageModel("wanx-v1-0521")).toBe(true);
   expect(isLegacyText2ImageModel("wan2.6-t2i")).toBe(false);
   expect(isLegacyText2ImageModel("wan2.6-image")).toBe(false);
   expect(isLegacyText2ImageModel("wan2.7-image")).toBe(false);
@@ -48,6 +49,7 @@ test("size profiles are model-specific, not sync/async", () => {
   expect(resolveImageSizeProfile("z-image-turbo")).toBe("z-image");
   expect(resolveImageSizeProfile("wan2.6-t2i")).toBe("wan26");
   expect(resolveImageSizeProfile("wanx-v1")).toBe("wanx-v1");
+  expect(resolveImageSizeProfile("wanx-v1-0521")).toBe("wanx-v1");
   expect(resolveImageSizeProfile("wan2.5-i2i-preview")).toBe("wan25-i2i");
   expect(resolveImageSizeProfile("wan2.2-t2i-plus")).toBe("wan-legacy");
 });
@@ -72,6 +74,13 @@ test("resolveImageGenerateApi picks path, input style, and size profile", () =>
     sizeProfile: "wanx-v1",
     inputStyle: "prompt",
   });
+  expect(resolveImageGenerateApi("wanx-v1-0521")).toMatchObject({
+    kind: "async-text2image",
+    path: "/api/v1/services/aigc/text2image/image-synthesis",
+    inputStyle: "prompt",
+    useSync: false,
+    sizeProfile: "wanx-v1",
+  });
   expect(resolveImageGenerateApi("wan2.6-t2i")).toMatchObject({
     kind: "async-image-generation",
     sizeProfile: "wan26",
diff --git a/packages/runtime/src/utils/image-size.ts b/packages/runtime/src/utils/image-size.ts
index 39590dc..d2fd1f7 100644
--- a/packages/runtime/src/utils/image-size.ts
+++ b/packages/runtime/src/utils/image-size.ts
@@ -46,11 +46,11 @@ export const Z_IMAGE_RATIO_MAP: Record<string, string> = {
   "2:3": "832*1248",
 };
 
-/** wan2.6-t2i / wan2.6-image / wan2.5-t2i — ~1280 class. */
+/** wan2.6-t2i / wan2.6-image / wan2.5-t2i — total pixels ≥ 1280*1280. */
 export const WAN26_RATIO_MAP: Record<string, string> = {
   "1:1": "1280*1280",
-  "16:9": "1280*720",
-  "9:16": "720*1280",
+  "16:9": "1696*960",
+  "9:16": "960*1696",
   "4:3": "1472*1104",
   "3:4": "1104*1472",
 };
diff --git a/packages/runtime/tests/image-size.test.ts b/packages/runtime/tests/image-size.test.ts
index b57df07..d5ae183 100644
--- a/packages/runtime/tests/image-size.test.ts
+++ b/packages/runtime/tests/image-size.test.ts
@@ -15,6 +15,12 @@ test("wanx-v1 profile maps 1:1 to 1024*1024", () => {
   expect(resolveImageSize("16:9", "wanx-v1")).toBe("1280*720");
 });
 
+test("wan26 profile maps 16:9 and 9:16 to ≥1280*1280 total pixels", () => {
+  expect(resolveImageSize("16:9", "wan26")).toBe("1696*960");
+  expect(resolveImageSize("9:16", "wan26")).toBe("960*1696");
+  expect(resolveImageSize("1:1", "wan26")).toBe("1280*1280");
+});
+
 test("wan2.5-i2i profile maps 1:1 to 1280*1280", () => {
   expect(resolveImageSize("1:1", "wan25-i2i")).toBe("1280*1280");
 });