diff --git a/.changeset/FN-6401-glm-5-2.md b/.changeset/FN-6401-glm-5-2.md
new file mode 100644
index 0000000000..a2892108a9
--- /dev/null
+++ b/.changeset/FN-6401-glm-5-2.md
@@ -0,0 +1,5 @@
+---
+"@runfusion/fusion": minor
+---
+
+Enable Z.ai GLM-5.2 model selection.
diff --git a/docs/settings-reference.md b/docs/settings-reference.md
index cfc7f7172e..80b942e2fc 100644
--- a/docs/settings-reference.md
+++ b/docs/settings-reference.md
@@ -801,6 +801,8 @@ Short-lived token bounds are enforced server-side:
 
 Fusion resolves task models through workflow-backed lane values first, then global lane defaults, then the project/global default model fallback. The common workflow lanes are stored as setting values on the project's default workflow and can be edited with dropdown controls from Settings -> Project Models -> Default workflow model lanes (persisted by the Settings modal's primary Save) or from workflow editor -> Settings -> Values for declared workflow lanes and fallbacks.
 
+Z.ai's built-in provider uses the existing `zai` auth entry / `ZAI_API_KEY` environment variable and includes `zai/glm-5.2` as a selectable model in the same dropdowns and workflow lane controls as the other built-in GLM models.
+
 ### Planning model
 
 1. Per-task `planningModelProvider` + `planningModelId`
diff --git a/packages/cli/src/commands/__tests__/daemon.test.ts b/packages/cli/src/commands/__tests__/daemon.test.ts
index 21f70d75a1..bb51b2c341 100644
--- a/packages/cli/src/commands/__tests__/daemon.test.ts
+++ b/packages/cli/src/commands/__tests__/daemon.test.ts
@@ -682,6 +682,17 @@ describe("runDaemon", () => {
     await runDaemon({});
     expect(mockSyncStartupModels).toHaveBeenCalledTimes(1);
   });
+
+  it("registers built-in zai GLM-5.2 before refreshing models", async () => {
+    await runDaemon({});
+
+    expect(mocks.modelRegistry.registerProvider).toHaveBeenCalledWith("zai", expect.objectContaining({
+      models: expect.arrayContaining([expect.objectContaining({ id: "glm-5.2" })]),
+    }));
+    expect(mocks.modelRegistry.refresh).toHaveBeenCalled();
+
+    await triggerSignal("SIGINT");
+  });
   const originalCwd = process.cwd;
   const originalExit = process.exit;
 
diff --git a/packages/cli/src/commands/__tests__/dashboard.test.ts b/packages/cli/src/commands/__tests__/dashboard.test.ts
index 19e9327970..37dc7badfd 100644
--- a/packages/cli/src/commands/__tests__/dashboard.test.ts
+++ b/packages/cli/src/commands/__tests__/dashboard.test.ts
@@ -832,10 +832,23 @@ async function runDashboard(...args: Parameters<typeof runDashboardImpl>): Retur
 // ── Tests ───────────────────────────────────────────────────────────
 
 describe("runDashboard — startup model sync", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
   it("invokes shared startup model sync", async () => {
     await runDashboard(0, { open: false });
     expect(mockSyncStartupModels).toHaveBeenCalledTimes(1);
   });
+
+  it("registers built-in zai GLM-5.2 before refreshing models", async () => {
+    await runDashboard(0, { open: false });
+
+    expect(mockModelRegistry.registerProvider).toHaveBeenCalledWith("zai", expect.objectContaining({
+      models: expect.arrayContaining([expect.objectContaining({ id: "glm-5.2" })]),
+    }));
+    expect(mockModelRegistry.refresh).toHaveBeenCalled();
+  });
 });
 
 function resetGitHubMocks() {
diff --git a/packages/cli/src/commands/__tests__/serve.test.ts b/packages/cli/src/commands/__tests__/serve.test.ts
index d1c7a9bf7d..29114ab488 100644
--- a/packages/cli/src/commands/__tests__/serve.test.ts
+++ b/packages/cli/src/commands/__tests__/serve.test.ts
@@ -752,6 +752,17 @@ describe("runServe", () => {
     await runServe(4040, {});
     expect(mockSyncStartupModels).toHaveBeenCalledTimes(1);
   });
+
+  it("registers built-in zai GLM-5.2 before refreshing models", async () => {
+    await runServe(0, {});
+
+    expect(mocks.modelRegistry.registerProvider).toHaveBeenCalledWith("zai", expect.objectContaining({
+      models: expect.arrayContaining([expect.objectContaining({ id: "glm-5.2" })]),
+    }));
+    expect(mocks.modelRegistry.refresh).toHaveBeenCalled();
+
+    await triggerSignal("SIGINT");
+  });
   const originalCwd = process.cwd;
   const originalOn = process.on;
   const originalExit = process.exit;
diff --git a/packages/cli/src/commands/daemon.ts b/packages/cli/src/commands/daemon.ts
index 4d3ba603ae..dbcd7a8b88 100644
--- a/packages/cli/src/commands/daemon.ts
+++ b/packages/cli/src/commands/daemon.ts
@@ -21,6 +21,8 @@ import {
   resolveGlobalDir,
   getEnabledPiExtensionPaths,
   reconcileClaudeCliPaths,
+  ZAI_PROVIDER_ID,
+  ZAI_PROVIDER_REGISTRATION,
 } from "@fusion/core";
 import type { AutomationRunResult, ScheduledTask } from "@fusion/core";
 import { createServer, GitHubClient, createSkillsAdapter, getProjectSettingsPath, loadTlsCredentialsFromEnv, registerGithubTrackingHook } from "@fusion/dashboard";
@@ -552,6 +554,12 @@ export async function runDaemon(opts: DaemonOptions = {}) {
   ]);
   const mergedAuthStorage = mergeAuthStorageReads(authStorage, [supplementalAuthStorage]);
   const modelRegistry = ModelRegistry.create(mergedAuthStorage, getModelRegistryModelsPath());
+  try {
+    modelRegistry.registerProvider(ZAI_PROVIDER_ID, ZAI_PROVIDER_REGISTRATION);
+  } catch (error) {
+    const message = error instanceof Error ? error.message : String(error);
+    console.log(`[extensions] Failed to register built-in ${ZAI_PROVIDER_ID} provider: ${message}`);
+  }
   const dashboardAuthStorage = wrapAuthStorageWithApiKeyProviders(mergedAuthStorage, modelRegistry);
 
   // PackageManager may be used for skills adapter even if extension loading fails
diff --git a/packages/cli/src/commands/dashboard.ts b/packages/cli/src/commands/dashboard.ts
index 4ce90ae0ee..5b7fd4a23c 100644
--- a/packages/cli/src/commands/dashboard.ts
+++ b/packages/cli/src/commands/dashboard.ts
@@ -20,6 +20,8 @@ import {
   resolveColumnFlags,
   BUILTIN_CODING_WORKFLOW_IR,
   parseWorkflowIr,
+  ZAI_PROVIDER_ID,
+  ZAI_PROVIDER_REGISTRATION,
   type WorkflowIrColumn,
   type TraitFlags,
 } from "@fusion/core";
@@ -1369,6 +1371,12 @@ export async function runDashboard(port: number, opts: { paused?: boolean; dev?:
   ]);
   const mergedAuthStorage = mergeAuthStorageReads(authStorage, [supplementalAuthStorage]);
   const modelRegistry = ModelRegistry.create(mergedAuthStorage, getModelRegistryModelsPath());
+  try {
+    modelRegistry.registerProvider(ZAI_PROVIDER_ID, ZAI_PROVIDER_REGISTRATION);
+  } catch (error) {
+    const message = error instanceof Error ? error.message : String(error);
+    logSink.log(`Failed to register built-in ${ZAI_PROVIDER_ID} provider: ${message}`, "extensions");
+  }
   const dashboardAuthStorage = wrapAuthStorageWithApiKeyProviders(mergedAuthStorage, modelRegistry);
 
   // PackageManager may be used for skills adapter even if extension loading fails.
diff --git a/packages/cli/src/commands/serve.ts b/packages/cli/src/commands/serve.ts
index 5945d98672..ac36dab835 100644
--- a/packages/cli/src/commands/serve.ts
+++ b/packages/cli/src/commands/serve.ts
@@ -21,6 +21,8 @@ import {
   GlobalSettingsStore,
   resolveGlobalDir,
   getEnabledPiExtensionPaths,
+  ZAI_PROVIDER_ID,
+  ZAI_PROVIDER_REGISTRATION,
 } from "@fusion/core";
 import type { AutomationRunResult, ScheduledTask } from "@fusion/core";
 import { createServer, GitHubClient, createSkillsAdapter, getProjectSettingsPath, loadTlsCredentialsFromEnv, registerGithubTrackingHook } from "@fusion/dashboard";
@@ -602,6 +604,12 @@ export async function runServe(
   ]);
   const mergedAuthStorage = mergeAuthStorageReads(authStorage, [supplementalAuthStorage]);
   const modelRegistry = ModelRegistry.create(mergedAuthStorage, getModelRegistryModelsPath());
+  try {
+    modelRegistry.registerProvider(ZAI_PROVIDER_ID, ZAI_PROVIDER_REGISTRATION);
+  } catch (error) {
+    const message = error instanceof Error ? error.message : String(error);
+    console.log(`[extensions] Failed to register built-in ${ZAI_PROVIDER_ID} provider: ${message}`);
+  }
   const dashboardAuthStorage = wrapAuthStorageWithApiKeyProviders(mergedAuthStorage, modelRegistry);
 
   // PackageManager may be used for skills adapter even if extension loading fails
diff --git a/packages/core/src/__tests__/zai-provider.test.ts b/packages/core/src/__tests__/zai-provider.test.ts
new file mode 100644
index 0000000000..42a89a1336
--- /dev/null
+++ b/packages/core/src/__tests__/zai-provider.test.ts
@@ -0,0 +1,48 @@
+import { describe, expect, it } from "vitest";
+import { ZAI_PROVIDER_ID, ZAI_PROVIDER_REGISTRATION } from "../zai-provider.js";
+
+const EXISTING_ZAI_MODELS = [
+  "glm-4.5-air",
+  "glm-4.7",
+  "glm-5-turbo",
+  "glm-5.1",
+  "glm-5v-turbo",
+];
+
+describe("ZAI_PROVIDER_REGISTRATION", () => {
+  it("uses the existing zai auth surface and API endpoint", () => {
+    expect(ZAI_PROVIDER_ID).toBe("zai");
+    expect(ZAI_PROVIDER_REGISTRATION).toMatchObject({
+      name: "ZAI",
+      baseUrl: "https://api.z.ai/api/coding/paas/v4",
+      apiKey: "$ZAI_API_KEY",
+      api: "openai-completions",
+    });
+  });
+
+  it("preserves existing built-in models and appends glm-5.2", () => {
+    const modelIds = ZAI_PROVIDER_REGISTRATION.models.map((model) => model.id);
+
+    expect(modelIds).toEqual([...EXISTING_ZAI_MODELS, "glm-5.2"]);
+    for (const id of EXISTING_ZAI_MODELS) {
+      expect(modelIds).toContain(id);
+    }
+  });
+
+  it("registers GLM-5.2 with upstream model capabilities", () => {
+    expect(ZAI_PROVIDER_REGISTRATION.models.find((model) => model.id === "glm-5.2")).toMatchObject({
+      id: "glm-5.2",
+      name: "GLM-5.2",
+      reasoning: true,
+      input: ["text"],
+      cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+      contextWindow: 1_000_000,
+      maxTokens: 131_072,
+      compat: {
+        supportsDeveloperRole: false,
+        thinkingFormat: "zai",
+        zaiToolStream: true,
+      },
+    });
+  });
+});
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index 6441dbe401..5ce09c5516 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -20,6 +20,8 @@ export { redactSecrets } from "./redact-secrets.js";
 export * from "./frontend-ux-policy.js";
 export { MOCK_PROVIDER_ID } from "./mock-provider-constants.js";
 export type { MockProviderId, MockSessionPurpose } from "./mock-provider-constants.js";
+export { ZAI_PROVIDER_ID, ZAI_PROVIDER_REGISTRATION } from "./zai-provider.js";
+export type { ZaiProviderRegistration } from "./zai-provider.js";
 export {
   resolveWorktrunkSettings,
   requiresWorktrunkInstallVerification,
diff --git a/packages/core/src/zai-provider.ts b/packages/core/src/zai-provider.ts
new file mode 100644
index 0000000000..121e709ae7
--- /dev/null
+++ b/packages/core/src/zai-provider.ts
@@ -0,0 +1,125 @@
+export const ZAI_PROVIDER_ID = "zai";
+
+type ZaiModelInput = "text" | "image";
+
+interface ZaiModelRegistration {
+  id: string;
+  name: string;
+  reasoning: boolean;
+  input: ZaiModelInput[];
+  cost: {
+    input: number;
+    output: number;
+    cacheRead: number;
+    cacheWrite: number;
+  };
+  contextWindow: number;
+  maxTokens: number;
+  compat: {
+    supportsDeveloperRole: boolean;
+    thinkingFormat: "zai";
+    zaiToolStream?: boolean;
+  };
+}
+
+export interface ZaiProviderRegistration {
+  name: string;
+  baseUrl: string;
+  apiKey: string;
+  api: "openai-completions";
+  models: ZaiModelRegistration[];
+}
+
+// pi registerProvider() replaces the provider's model list, so keep every
+// currently built-in Z.ai model here and append new models such as GLM-5.2.
+export const ZAI_PROVIDER_REGISTRATION: ZaiProviderRegistration = {
+  name: "ZAI",
+  baseUrl: "https://api.z.ai/api/coding/paas/v4",
+  apiKey: "$ZAI_API_KEY",
+  api: "openai-completions",
+  models: [
+    {
+      id: "glm-4.5-air",
+      name: "GLM-4.5-Air",
+      reasoning: true,
+      input: ["text"],
+      cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+      contextWindow: 131072,
+      maxTokens: 98304,
+      compat: {
+        supportsDeveloperRole: false,
+        thinkingFormat: "zai",
+      },
+    },
+    {
+      id: "glm-4.7",
+      name: "GLM-4.7",
+      reasoning: true,
+      input: ["text"],
+      cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+      contextWindow: 204800,
+      maxTokens: 131072,
+      compat: {
+        supportsDeveloperRole: false,
+        thinkingFormat: "zai",
+        zaiToolStream: true,
+      },
+    },
+    {
+      id: "glm-5-turbo",
+      name: "GLM-5-Turbo",
+      reasoning: true,
+      input: ["text"],
+      cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+      contextWindow: 200000,
+      maxTokens: 131072,
+      compat: {
+        supportsDeveloperRole: false,
+        thinkingFormat: "zai",
+        zaiToolStream: true,
+      },
+    },
+    {
+      id: "glm-5.1",
+      name: "GLM-5.1",
+      reasoning: true,
+      input: ["text"],
+      cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+      contextWindow: 200000,
+      maxTokens: 131072,
+      compat: {
+        supportsDeveloperRole: false,
+        thinkingFormat: "zai",
+        zaiToolStream: true,
+      },
+    },
+    {
+      id: "glm-5v-turbo",
+      name: "GLM-5V-Turbo",
+      reasoning: true,
+      input: ["text", "image"],
+      cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+      contextWindow: 200000,
+      maxTokens: 131072,
+      compat: {
+        supportsDeveloperRole: false,
+        thinkingFormat: "zai",
+        zaiToolStream: true,
+      },
+    },
+    {
+      id: "glm-5.2",
+      name: "GLM-5.2",
+      reasoning: true,
+      input: ["text"],
+      cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+      contextWindow: 1000000,
+      maxTokens: 131072,
+      compat: {
+        supportsDeveloperRole: false,
+        thinkingFormat: "zai",
+        zaiToolStream: true,
+      },
+    },
+  ],
+};
diff --git a/packages/engine/src/__tests__/pi-create-fn-agent.test.ts b/packages/engine/src/__tests__/pi-create-fn-agent.test.ts
index 5ffa69f693..321358c385 100644
--- a/packages/engine/src/__tests__/pi-create-fn-agent.test.ts
+++ b/packages/engine/src/__tests__/pi-create-fn-agent.test.ts
@@ -1336,7 +1336,10 @@ describe("createFnAgent", () => {
       "/tmp",
       "/tmp/.fusion/disabled-auto-extension-discovery",
     );
-    expect(registerProviderMock).toHaveBeenCalledWith("zai", expect.objectContaining({
+    expect(registerProviderMock).toHaveBeenNthCalledWith(1, "zai", expect.objectContaining({
+      models: expect.arrayContaining([expect.objectContaining({ id: "glm-5.2" })]),
+    }));
+    expect(registerProviderMock).toHaveBeenNthCalledWith(2, "zai", expect.objectContaining({
       models: [{ id: "glm-5.1" }],
     }));
     expect(refreshMock).toHaveBeenCalled();
diff --git a/packages/engine/src/pi.ts b/packages/engine/src/pi.ts
index 790c863501..85e3567b53 100644
--- a/packages/engine/src/pi.ts
+++ b/packages/engine/src/pi.ts
@@ -34,7 +34,18 @@ import {
   type AgentSession,
   type ToolDefinition,
 } from "@earendil-works/pi-coding-agent";
-import { customProviderRegistryKey, getEnabledPiExtensionPaths, getFusionAgentDir, getLegacyPiAgentDir, getProjectRootFromWorktree, reconcileClaudeCliPaths, reconcileDroidCliPaths, resolvePiExtensionProjectRoot } from "@fusion/core";
+import {
+  customProviderRegistryKey,
+  getEnabledPiExtensionPaths,
+  getFusionAgentDir,
+  getLegacyPiAgentDir,
+  getProjectRootFromWorktree,
+  reconcileClaudeCliPaths,
+  reconcileDroidCliPaths,
+  resolvePiExtensionProjectRoot,
+  ZAI_PROVIDER_ID,
+  ZAI_PROVIDER_REGISTRATION,
+} from "@fusion/core";
 import type {
   AgentPermissionPolicyActionCategory,
   PermanentAgentActionCategory,
@@ -1353,6 +1364,13 @@ function resolveVendoredDroidCliEntry(): string | null {
 }
 
 async function registerExtensionProviders(cwd: string, modelRegistry: ModelRegistry): Promise<void> {
+  try {
+    modelRegistry.registerProvider(ZAI_PROVIDER_ID, ZAI_PROVIDER_REGISTRATION);
+  } catch (error) {
+    const message = error instanceof Error ? error.message : String(error);
+    extensionsLog.warn(`Failed to register built-in ${ZAI_PROVIDER_ID} provider: ${message}`);
+  }
+
   try {
     const agentDir = getPackageManagerAgentDir();
     const packageManager = new DefaultPackageManager({