diff --git a/changelog.d/fixes/10832-unprefixed-dalle3.md b/changelog.d/fixes/10832-unprefixed-dalle3.md
new file mode 100644
index 0000000000..2dfd970b13
--- /dev/null
+++ b/changelog.d/fixes/10832-unprefixed-dalle3.md
@@ -0,0 +1 @@
+- **fix(images):** register OpenAI `dall-e-3` in the image registry so unprefixed `dall-e-3` (and `openai/dall-e-3`) route to OpenAI Images instead of Microsoft Designer Web, and so the chat catalog no longer lists `openai/dall-e-3` as a 128k chat model ([#10832](https://github.com/diegosouzapw/OmniRoute/issues/10832))
diff --git a/open-sse/config/imageRegistry.ts b/open-sse/config/imageRegistry.ts
index d50865599d..17ce7de90e 100644
--- a/open-sse/config/imageRegistry.ts
+++ b/open-sse/config/imageRegistry.ts
@@ -210,6 +210,7 @@ export const IMAGE_PROVIDERS: Record<string, ImageProviderConfig> = {
     authHeader: "bearer",
     format: "openai", // native OpenAI format
     models: [
+      { id: "dall-e-3", name: "DALL·E 3" },
       { id: "gpt-image-2", name: "GPT Image 2" },
       { id: "gpt-image-1.5", name: "GPT Image 1.5" },
       { id: "gpt-image-1-mini", name: "GPT Image 1 Mini" },
diff --git a/tests/unit/unprefixed-dalle3-10832.test.ts b/tests/unit/unprefixed-dalle3-10832.test.ts
new file mode 100644
index 0000000000..ae6200cbf5
--- /dev/null
+++ b/tests/unit/unprefixed-dalle3-10832.test.ts
@@ -0,0 +1,43 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import {
+  IMAGE_PROVIDERS,
+  parseImageModel,
+  getAllImageModels,
+  isRegisteredImageModel,
+} from "../../open-sse/config/imageRegistry.ts";
+
+test("#10832 unprefixed dall-e-3 routes to OpenAI, not Microsoft Designer Web", () => {
+  assert.deepEqual(parseImageModel("dall-e-3"), {
+    provider: "openai",
+    model: "dall-e-3",
+  });
+  assert.deepEqual(parseImageModel("openai/dall-e-3"), {
+    provider: "openai",
+    model: "dall-e-3",
+  });
+  assert.deepEqual(parseImageModel("microsoft-designer-web/dall-e-3"), {
+    provider: "microsoft-designer-web",
+    model: "dall-e-3",
+  });
+  assert.deepEqual(parseImageModel("msdesigner/dall-e-3"), {
+    provider: "microsoft-designer-web",
+    model: "dall-e-3",
+  });
+
+  assert.equal(isRegisteredImageModel("openai", "dall-e-3"), true);
+  assert.equal(isRegisteredImageModel("microsoft-designer-web", "dall-e-3"), true);
+
+  const openai = IMAGE_PROVIDERS.openai;
+  assert.ok(openai.models.some((model) => model.id === "dall-e-3"));
+
+  const catalog = getAllImageModels();
+  assert.ok(catalog.some((model) => model.id === "openai/dall-e-3" && model.provider === "openai"));
+  assert.ok(
+    catalog.some(
+      (model) =>
+        model.id === "microsoft-designer-web/dall-e-3" &&
+        model.provider === "microsoft-designer-web"
+    )
+  );
+});