diff --git a/src/sse/services/model.js b/src/sse/services/model.js
index d426e4f0..ba4cc6c2 100644
--- a/src/sse/services/model.js
+++ b/src/sse/services/model.js
@@ -1,6 +1,7 @@
 // Re-export from open-sse with localDb integration
 import { getModelAliases, getComboByName, getProviderNodes } from "@/lib/localDb";
 import { parseModel as parseModelCore, resolveModelAliasFromMap, getModelInfoCore } from "open-sse/services/model.js";
+import REGISTRY from "open-sse/providers/registry/index.js";
 
 // Local provider alias overrides (HMR-friendly, applied on top of open-sse map)
 const LOCAL_PROVIDER_ALIASES = {
@@ -8,6 +9,13 @@ const LOCAL_PROVIDER_ALIASES = {
   "xiaomi-tokenplan": "xiaomi-tokenplan",
 };
 
+const RESERVED_PROVIDER_PREFIXES = new Set(Object.keys(LOCAL_PROVIDER_ALIASES));
+for (const entry of REGISTRY) {
+  RESERVED_PROVIDER_PREFIXES.add(entry.id);
+  if (entry.alias) RESERVED_PROVIDER_PREFIXES.add(entry.alias);
+  for (const alias of entry.aliases || []) RESERVED_PROVIDER_PREFIXES.add(alias);
+}
+
 export function parseModel(modelStr) {
   const parsed = parseModelCore(modelStr);
   if (parsed?.providerAlias && LOCAL_PROVIDER_ALIASES[parsed.providerAlias]) {
@@ -31,23 +39,26 @@ export async function getModelInfo(modelStr) {
   const parsed = parseModel(modelStr);
 
   if (!parsed.isAlias) {
-    // Always check provider-node prefix matching using original input first
-    const openaiNodes = await getProviderNodes({ type: "openai-compatible" });
-    const matchedOpenAI = openaiNodes.find((node) => node.prefix === parsed.providerAlias);
-    if (matchedOpenAI) {
-      return { provider: matchedOpenAI.id, model: parsed.model };
-    }
+    // Provider-node prefixes are user-defined. They must not override built-in
+    // provider ids/aliases such as `cf`, `cloudflare-ai`, `openai`, or `hf`.
+    if (!RESERVED_PROVIDER_PREFIXES.has(parsed.providerAlias)) {
+      const openaiNodes = await getProviderNodes({ type: "openai-compatible" });
+      const matchedOpenAI = openaiNodes.find((node) => node.prefix === parsed.providerAlias);
+      if (matchedOpenAI) {
+        return { provider: matchedOpenAI.id, model: parsed.model };
+      }
 
-    const anthropicNodes = await getProviderNodes({ type: "anthropic-compatible" });
-    const matchedAnthropic = anthropicNodes.find((node) => node.prefix === parsed.providerAlias);
-    if (matchedAnthropic) {
-      return { provider: matchedAnthropic.id, model: parsed.model };
-    }
+      const anthropicNodes = await getProviderNodes({ type: "anthropic-compatible" });
+      const matchedAnthropic = anthropicNodes.find((node) => node.prefix === parsed.providerAlias);
+      if (matchedAnthropic) {
+        return { provider: matchedAnthropic.id, model: parsed.model };
+      }
 
-    const embeddingNodes = await getProviderNodes({ type: "custom-embedding" });
-    const matchedEmbedding = embeddingNodes.find((node) => node.prefix === parsed.providerAlias);
-    if (matchedEmbedding) {
-      return { provider: matchedEmbedding.id, model: parsed.model };
+      const embeddingNodes = await getProviderNodes({ type: "custom-embedding" });
+      const matchedEmbedding = embeddingNodes.find((node) => node.prefix === parsed.providerAlias);
+      if (matchedEmbedding) {
+        return { provider: matchedEmbedding.id, model: parsed.model };
+      }
     }
     return {
       provider: parsed.provider,
diff --git a/tests/unit/model-routing.test.js b/tests/unit/model-routing.test.js
new file mode 100644
index 00000000..827e1319
--- /dev/null
+++ b/tests/unit/model-routing.test.js
@@ -0,0 +1,80 @@
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { describe, it, expect, beforeEach, afterEach, vi } from "vitest";
+
+const originalDataDir = process.env.DATA_DIR;
+
+async function setupDb() {
+  const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), "9router-model-routing-"));
+  process.env.DATA_DIR = tempDir;
+  vi.resetModules();
+
+  const { createProviderNode } = await import("@/models/index.js");
+  const { getModelInfo } = await import("@/sse/services/model.js");
+
+  return {
+    createProviderNode,
+    getModelInfo,
+    cleanup() {
+      fs.rmSync(tempDir, { recursive: true, force: true });
+    },
+  };
+}
+
+describe("model routing", () => {
+  let cleanup = () => {};
+
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  afterEach(() => {
+    vi.resetModules();
+    vi.clearAllMocks();
+    cleanup();
+    cleanup = () => {};
+    if (originalDataDir === undefined) delete process.env.DATA_DIR;
+    else process.env.DATA_DIR = originalDataDir;
+  });
+
+  it("keeps built-in provider aliases ahead of compatible node prefixes", async () => {
+    const ctx = await setupDb();
+    cleanup = ctx.cleanup;
+
+    await ctx.createProviderNode({
+      id: "openai-compatible-chat-test",
+      type: "openai-compatible",
+      name: "Compatible CF Collision",
+      prefix: "cf",
+      apiType: "chat",
+      baseUrl: "https://compatible.test/v1",
+    });
+
+    await expect(ctx.getModelInfo("cf/@cf/black-forest-labs/flux-2-klein-9b"))
+      .resolves.toEqual({
+        provider: "cloudflare-ai",
+        model: "@cf/black-forest-labs/flux-2-klein-9b",
+      });
+  });
+
+  it("still routes non-reserved compatible node prefixes", async () => {
+    const ctx = await setupDb();
+    cleanup = ctx.cleanup;
+
+    await ctx.createProviderNode({
+      id: "openai-compatible-chat-test",
+      type: "openai-compatible",
+      name: "Compatible OCT",
+      prefix: "oct",
+      apiType: "chat",
+      baseUrl: "https://compatible.test/v1",
+    });
+
+    await expect(ctx.getModelInfo("oct/gpt-image-1"))
+      .resolves.toEqual({
+        provider: "openai-compatible-chat-test",
+        model: "gpt-image-1",
+      });
+  });
+});