diff --git a/scripts/sync-vip98k-nano-banana-21.ts b/scripts/sync-vip98k-nano-banana-21.ts
new file mode 100644
index 000000000..af28c28ec
--- /dev/null
+++ b/scripts/sync-vip98k-nano-banana-21.ts
@@ -0,0 +1,136 @@
+import dotenv from "dotenv";
+import { mkdirSync, writeFileSync } from "node:fs";
+import { join } from "node:path";
+import postgres from "postgres";
+import {
+  buildVip98kModelPresets,
+  fetchVip98kCatalog,
+} from "../lib/ai/vip98k-models";
+
+const MODEL_ID = "nano-banana-2.1";
+dotenv.config({ path: ".env.local", quiet: true });
+
+async function main() {
+  if (!process.env.POSTGRES_URL) throw new Error("POSTGRES_URL is required");
+  const sql = postgres(process.env.POSTGRES_URL, { max: 1, prepare: false });
+  try {
+    const providers = await sql`
+      select id, "baseUrl", "apiKey" from "AiProvider"
+      where type = 'vip98k' and "isEnabled" = true
+    `;
+    const candidates = providers.filter(
+      (provider) => new URL(provider.baseUrl).hostname === "api.vip98k.com",
+    );
+    if (candidates.length !== 1) {
+      throw new Error("Expected exactly one enabled api.vip98k.com provider");
+    }
+    const provider = candidates[0]!;
+    const catalog = await fetchVip98kCatalog({
+      baseURL: provider.baseUrl,
+      apiKey: provider.apiKey,
+    });
+    const model = catalog.find(
+      (item) => (item.modelId || item.id || item.name) === MODEL_ID,
+    );
+    if (!model) throw new Error("Model is absent from the authorized catalog");
+    const preset = buildVip98kModelPresets([model])[0];
+    if (!preset || preset.isHidden || !preset.supportsVision) {
+      throw new Error("Published model does not qualify for reference-image generation");
+    }
+
+    // Use the published asynchronous contract for both text and reference input.
+    // This preserves native resolution and aspect ratio instead of prompt hints.
+    const metadata = preset.capabilities.vip98k as {
+      invocation: Record<string, unknown>;
+      invocations: Array<{
+        kind: string;
+        path: string;
+        requestExample: Record<string, unknown>;
+        inputSchema?: { properties?: Record<string, { enum?: string[] }> };
+      }>;
+    };
+    const invocation = metadata.invocations.find(
+      (item) => item.kind === "task" && item.path === "/extensions/v1/tasks",
+    );
+    const fields = invocation?.inputSchema?.properties;
+    if (
+      !invocation || !fields?.file_urls || !fields.aspect_ratio ||
+      !["1K", "2K", "4K"].every((size) => fields.resolution?.enum?.includes(size))
+    ) {
+      throw new Error("Expected asynchronous multi-reference and 1K/2K/4K contract");
+    }
+    const taskMetadata = { ...metadata, invocation, invocations: [invocation] };
+    const capabilities = { ...preset.capabilities, vip98k: taskMetadata };
+    const imageGenConfig = {
+      ...preset.imageGenConfig,
+      supportsQuality: false,
+      vip98k: taskMetadata,
+    };
+    const { quality: _quality, ...defaultParams } = preset.defaultParams;
+    const existing = await sql`
+      select * from "AiModel"
+      where "providerId" = ${provider.id} and "modelId" = ${MODEL_ID}
+    `;
+    if (existing.length > 1) throw new Error("Duplicate model rows require reconciliation");
+    const summary = {
+      modelId: MODEL_ID,
+      providerId: provider.id,
+      apply: process.argv.includes("--apply"),
+      exists: existing.length === 1,
+      sizes: capabilities.supportedImageSizes,
+      supportsReferenceImages: preset.supportsVision,
+      invocationPath: invocation.path,
+    };
+    if (!summary.apply) return console.log(JSON.stringify(summary, null, 2));
+
+    const backupIndex = process.argv.indexOf("--backup-dir");
+    if (backupIndex < 0 || !process.argv[backupIndex + 1]) {
+      throw new Error("--backup-dir is required when applying configuration");
+    }
+    const backupDir = process.argv[backupIndex + 1]!;
+    mkdirSync(backupDir, { recursive: true, mode: 0o700 });
+    writeFileSync(join(backupDir, `model-before-${Date.now()}.json`), JSON.stringify(existing), { mode: 0o600 });
+    const asJson = (value: unknown) => sql.json(JSON.parse(JSON.stringify(value)));
+    const id = await sql.begin(async (tx) => {
+      await tx`select pg_advisory_xact_lock(hashtext(${provider.id + ":" + MODEL_ID}))`;
+      const rows = await tx`
+        select id from "AiModel"
+        where "providerId" = ${provider.id} and "modelId" = ${MODEL_ID}
+        for update
+      `;
+      if (rows.length > 1) throw new Error("Duplicate model rows");
+      if (!rows.length) {
+        const [created] = await tx`
+          insert into "AiModel" (
+            "providerId", "modelId", "displayName", description,
+            "supportsVision", "supportsImageGen", "isEnabled", "isHidden",
+            "isDefault", "sortOrder", capabilities, "defaultParams", "imageGenConfig"
+          ) values (
+            ${provider.id}, ${MODEL_ID}, ${preset.displayName}, ${preset.description},
+            true, true, true, false, false, 106,
+            ${asJson(capabilities)}, ${asJson(defaultParams)}, ${asJson(imageGenConfig)}
+          ) returning id
+        `;
+        return created!.id;
+      }
+      await tx`
+        update "AiModel" set
+          "displayName" = ${preset.displayName}, description = ${preset.description},
+          "supportsVision" = true, "supportsImageGen" = true,
+          "isEnabled" = true, "isHidden" = false,
+          capabilities = ${asJson(capabilities)}, "defaultParams" = ${asJson(defaultParams)},
+          "imageGenConfig" = ${asJson(imageGenConfig)}, "updatedAt" = now()
+        where id = ${rows[0]!.id}
+      `;
+      return rows[0]!.id;
+    });
+    console.log(JSON.stringify({ ...summary, id, enabled: true, visible: true }, null, 2));
+  } finally {
+    await sql.end();
+  }
+}
+
+main().catch((error) => {
+  console.error(error instanceof Error ? error.message : "Model synchronization failed");
+  process.exitCode = 1;
+});