diff --git a/src/commands/cleanup-utils.test.ts b/src/commands/cleanup-utils.test.ts
index 89d9051cbee4..665f304a4769 100644
--- a/src/commands/cleanup-utils.test.ts
+++ b/src/commands/cleanup-utils.test.ts
@@ -4,7 +4,6 @@ import os from "node:os";
 import path from "node:path";
 import { describe, expect, it, test, vi } from "vitest";
 import type { OpenClawConfig } from "../config/config.js";
-import { applyAgentDefaultPrimaryModel } from "../plugins/provider-model-primary.js";
 import type { RuntimeEnv } from "../runtime.js";
 import { withEnvAsync } from "../test-utils/env.js";
 import {
@@ -70,38 +69,6 @@ describe("buildCleanupPlan", () => {
   });
 });
 
-describe("applyAgentDefaultPrimaryModel", () => {
-  it("does not mutate when already set", () => {
-    const cfg = { agents: { defaults: { model: { primary: "a/b" } } } } as OpenClawConfig;
-    const result = applyAgentDefaultPrimaryModel({ cfg, model: "a/b" });
-    expect(result.changed).toBe(false);
-    expect(result.next).toBe(cfg);
-  });
-
-  it("normalizes legacy models", () => {
-    const cfg = { agents: { defaults: { model: { primary: "legacy" } } } } as OpenClawConfig;
-    const result = applyAgentDefaultPrimaryModel({
-      cfg,
-      model: "a/b",
-      legacyModels: new Set(["legacy"]),
-    });
-    expect(result.changed).toBe(false);
-    expect(result.next).toBe(cfg);
-  });
-
-  it("normalizes retired Google Gemini primary models before writing config", () => {
-    const cfg = { agents: { defaults: {} } } as OpenClawConfig;
-    const result = applyAgentDefaultPrimaryModel({
-      cfg,
-      model: "google/gemini-3-pro-preview",
-    });
-    expect(result.changed).toBe(true);
-    expect(result.next.agents?.defaults?.model).toEqual({
-      primary: "google/gemini-3.1-pro-preview",
-    });
-  });
-});
-
 describe("cleanup path removals", () => {
   function createRuntimeMock() {
     return {
diff --git a/src/plugins/provider-model-primary.ts b/src/plugins/provider-model-primary.ts
index bffbf059feab..f2a0aae0c592 100644
--- a/src/plugins/provider-model-primary.ts
+++ b/src/plugins/provider-model-primary.ts
@@ -3,54 +3,8 @@ import {
   normalizeAgentModelMapForConfig,
   normalizeAgentModelRefForConfig,
 } from "../config/model-input.js";
-import type { AgentModelListConfig } from "../config/types.js";
 import type { OpenClawConfig } from "../config/types.openclaw.js";
 
-function resolvePrimaryModel(model?: AgentModelListConfig | string): string | undefined {
-  if (typeof model === "string") {
-    return model;
-  }
-  if (model && typeof model === "object" && typeof model.primary === "string") {
-    return model.primary;
-  }
-  return undefined;
-}
-
-/** Applies an agent default primary model and reports whether config changed. */
-export function applyAgentDefaultPrimaryModel(params: {
-  cfg: OpenClawConfig;
-  model: string;
-  legacyModels?: Set<string>;
-}): { next: OpenClawConfig; changed: boolean } {
-  const model = normalizeAgentModelRefForConfig(params.model);
-  const current = resolvePrimaryModel(params.cfg.agents?.defaults?.model)?.trim();
-  const normalizedCurrent = current && params.legacyModels?.has(current) ? model : current;
-  if (normalizedCurrent === model) {
-    return { next: params.cfg, changed: false };
-  }
-
-  return {
-    next: {
-      ...params.cfg,
-      agents: {
-        ...params.cfg.agents,
-        defaults: {
-          ...params.cfg.agents?.defaults,
-          model:
-            params.cfg.agents?.defaults?.model &&
-            typeof params.cfg.agents.defaults.model === "object"
-              ? {
-                  ...params.cfg.agents.defaults.model,
-                  primary: model,
-                }
-              : { primary: model },
-        },
-      },
-    },
-    changed: true,
-  };
-}
-
 /** Applies a primary model to agent defaults while preserving model fallback metadata. */
 export function applyPrimaryModel(cfg: OpenClawConfig, model: string): OpenClawConfig {
   const normalizedModel = normalizeAgentModelRefForConfig(model);