diff --git a/src/app/api/v1/models/catalog.ts b/src/app/api/v1/models/catalog.ts
index 788ea4bbe6..b8d2942282 100644
--- a/src/app/api/v1/models/catalog.ts
+++ b/src/app/api/v1/models/catalog.ts
@@ -1230,7 +1230,7 @@ async function buildUnifiedModelsResponseCore(
             continue;
           }
 
-          if (includeAlias) {
+          if (includeAlias || Boolean(prefix)) {
             models.push({
               id: aliasId,
               object: "model",
@@ -1242,7 +1242,7 @@ async function buildUnifiedModelsResponseCore(
               ...syncedFields,
             });
           }
-          if (includeAlias && modelType === "audio") {
+          if ((includeAlias || Boolean(prefix)) && modelType === "audio") {
             models.push({
               id: aliasId,
               object: "model",
@@ -1655,7 +1655,7 @@ async function buildUnifiedModelsResponseCore(
             ? getCustomVisionCapabilityFields(model, aliasId, modelId)
             : null;
 
-          if (includeAlias) {
+          if (includeAlias || Boolean(prefix)) {
             models.push({
               id: aliasId,
               object: "model",
@@ -1773,7 +1773,7 @@ async function buildUnifiedModelsResponseCore(
         const visionFields =
           getVisionCapabilityFields(aliasId) || getVisionCapabilityFields(modelId);
 
-        if (includeAlias) {
+        if (includeAlias || Boolean(nodePrefix)) {
           models.push({
             id: aliasId,
             object: "model",
diff --git a/tests/unit/models-catalog-custom-node-prefix.test.ts b/tests/unit/models-catalog-custom-node-prefix.test.ts
new file mode 100644
index 0000000000..c3684ecab7
--- /dev/null
+++ b/tests/unit/models-catalog-custom-node-prefix.test.ts
@@ -0,0 +1,109 @@
+import assert from "node:assert/strict";
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import test from "node:test";
+
+const TEST_DATA_DIR = fs.mkdtempSync(path.join(os.tmpdir(), "omniroute-custom-node-prefix-"));
+process.env.DATA_DIR = TEST_DATA_DIR;
+
+const aliasesDb = await import("../../src/lib/db/models/aliases.ts");
+const core = await import("../../src/lib/db/core.ts");
+const modelsDb = await import("../../src/lib/db/models.ts");
+const providersDb = await import("../../src/lib/db/providers.ts");
+const modelsCatalog = await import("../../src/app/api/v1/models/catalog.ts");
+const modelsRoute = await import("../../src/app/api/v1/models/route.ts");
+
+const NODE_ID = "openai-compatible-chat-550e8400-e29b-41d4-a716-446655440000";
+const PREFIX = "infrex";
+const EXPECTED_IDS = [
+  `${PREFIX}/synced-model`,
+  `${PREFIX}/custom-model`,
+  `${PREFIX}/alias-backed-model`,
+];
+
+async function resetStorage(): Promise<void> {
+  core.resetDbInstance();
+  fs.rmSync(TEST_DATA_DIR, { recursive: true, force: true });
+  fs.mkdirSync(TEST_DATA_DIR, { recursive: true });
+  modelsCatalog.__resetCatalogBuilderRunsForTest();
+}
+
+async function seedCustomNode(): Promise<void> {
+  await providersDb.createProviderNode({
+    id: NODE_ID,
+    type: "openai-compatible",
+    name: "Infrex",
+    prefix: PREFIX,
+    baseUrl: "https://proxy.example.com",
+    chatPath: "/v1/chat/completions",
+    modelsPath: "/v1/models",
+  });
+  const connection = await providersDb.createProviderConnection({
+    provider: NODE_ID,
+    authType: "apikey",
+    name: "infrex-primary",
+    apiKey: "test-key",
+    isActive: true,
+    testStatus: "active",
+    providerSpecificData: {
+      baseUrl: "https://proxy.example.com",
+      chatPath: "/v1/chat/completions",
+      modelsPath: "/v1/models",
+    },
+  });
+
+  await modelsDb.replaceSyncedAvailableModelsForConnection(
+    NODE_ID,
+    (connection as { id: string }).id,
+    [{ id: "synced-model", source: "imported", supportedEndpoints: ["chat"] }]
+  );
+  await modelsDb.addCustomModel(NODE_ID, "custom-model", "Custom Model");
+  await aliasesDb.setModelAlias("alias-backed-model", `${NODE_ID}/alias-backed-model`);
+}
+
+async function getCatalogIds(mode: "alias" | "canonical" | "dual"): Promise<string[]> {
+  modelsCatalog.__resetCatalogBuilderRunsForTest();
+  const response = await modelsRoute.GET(
+    new Request(`http://localhost/api/v1/models?prefix=${mode}`)
+  );
+  assert.equal(response.status, 200);
+  const body = (await response.json()) as { data: Array<{ id: string }> };
+  return body.data.map((model) => model.id);
+}
+
+function assertCustomNodeModels(ids: string[]): void {
+  const actualCustomNodeIds = ids.filter((id) => EXPECTED_IDS.includes(id)).sort();
+  assert.deepEqual(
+    actualCustomNodeIds,
+    [...EXPECTED_IDS].sort(),
+    `expected each custom node source exactly once in ${JSON.stringify(ids)}`
+  );
+  assert.equal(
+    ids.some((id) => id.startsWith(`${NODE_ID}/`)),
+    false,
+    "catalog must not expose the internal provider node id"
+  );
+}
+
+test.beforeEach(async () => {
+  await resetStorage();
+  await seedCustomNode();
+});
+
+test.after(() => {
+  core.resetDbInstance();
+  fs.rmSync(TEST_DATA_DIR, { recursive: true, force: true });
+});
+
+test("alias mode exposes every custom node model under its configured prefix", async () => {
+  assertCustomNodeModels(await getCatalogIds("alias"));
+});
+
+test("canonical mode keeps custom node models under their configured prefix", async () => {
+  assertCustomNodeModels(await getCatalogIds("canonical"));
+});
+
+test("dual mode exposes each custom node model once under its configured prefix", async () => {
+  assertCustomNodeModels(await getCatalogIds("dual"));
+});