diff --git a/src/agents/model-scan.test.ts b/src/agents/model-scan.test.ts
index d037e8023cc..b8540af6fb8 100644
--- a/src/agents/model-scan.test.ts
+++ b/src/agents/model-scan.test.ts
@@ -80,4 +80,35 @@ describe("scanOpenRouterModels", () => {
       ).rejects.toThrow(/Missing OpenRouter API key/);
     });
   });
+
+  it("matches provider filters across canonical provider aliases", async () => {
+    const fetchImpl = createFetchFixture({
+      data: [
+        {
+          id: "z.ai/glm-5",
+          name: "GLM-5",
+          context_length: 128_000,
+          supported_parameters: [],
+          modality: "text",
+          pricing: { prompt: "0", completion: "0" },
+        },
+        {
+          id: "openai/gpt-5",
+          name: "GPT-5",
+          context_length: 128_000,
+          supported_parameters: [],
+          modality: "text",
+          pricing: { prompt: "0", completion: "0" },
+        },
+      ],
+    });
+
+    const results = await scanOpenRouterModels({
+      fetchImpl,
+      probe: false,
+      providerFilter: "z-ai",
+    });
+
+    expect(results.map((entry) => entry.id)).toEqual(["z.ai/glm-5"]);
+  });
 });
diff --git a/src/agents/model-scan.ts b/src/agents/model-scan.ts
index dec46b4db21..5b30d8d4478 100644
--- a/src/agents/model-scan.ts
+++ b/src/agents/model-scan.ts
@@ -9,6 +9,7 @@ import {
 } from "@mariozechner/pi-ai";
 import { Type } from "@sinclair/typebox";
 import { inferParamBFromIdOrName } from "../shared/model-param-b.js";
+import { normalizeProviderId } from "./provider-id.js";
 
 const OPENROUTER_MODELS_URL = "https://openrouter.ai/api/v1/models";
 const DEFAULT_TIMEOUT_MS = 12_000;
@@ -408,7 +409,7 @@ export async function scanOpenRouterModels(
   const concurrency = Math.max(1, Math.floor(options.concurrency ?? DEFAULT_CONCURRENCY));
   const minParamB = Math.max(0, Math.floor(options.minParamB ?? 0));
   const maxAgeDays = Math.max(0, Math.floor(options.maxAgeDays ?? 0));
-  const providerFilter = options.providerFilter?.trim().toLowerCase() ?? "";
+  const providerFilter = normalizeProviderId(options.providerFilter ?? "");
 
   const catalog = await fetchOpenRouterModels(fetchImpl);
   const now = Date.now();
@@ -418,7 +419,7 @@ export async function scanOpenRouterModels(
       return false;
     }
     if (providerFilter) {
-      const prefix = entry.id.split("/")[0]?.toLowerCase() ?? "";
+      const prefix = normalizeProviderId(entry.id.split("/")[0] ?? "");
       if (prefix !== providerFilter) {
         return false;
       }