diff --git a/tests/unit/api/profile-writer-anthropic.test.ts b/tests/unit/api/profile-writer-anthropic.test.ts
index 0416c321..f25c016b 100644
--- a/tests/unit/api/profile-writer-anthropic.test.ts
+++ b/tests/unit/api/profile-writer-anthropic.test.ts
@@ -3,6 +3,7 @@ import * as fs from 'fs';
 import * as os from 'os';
 import * as path from 'path';
 import { createApiProfile } from '../../../src/api/services/profile-writer';
+import { getPresetById } from '../../../src/api/services/provider-presets';
 
 describe('profile-writer Anthropic direct', () => {
   let tempHome = '';
@@ -131,10 +132,14 @@ describe('profile-writer Anthropic direct', () => {
     expect(config.profile_targets?.['hf-target-claude']).toBeUndefined();
   });
 
-  it('preserves OpenRouter ANTHROPIC_API_KEY blank behavior', () => {
+  it('preserves OpenRouter ANTHROPIC_API_KEY blank behavior and resolves preset baseUrl without duplicating /v1 (#1728)', () => {
+    const preset = getPresetById('openrouter');
+    expect(preset).toBeDefined();
+    expect(preset?.baseUrl).toBe('https://openrouter.ai/api');
+
     const result = createApiProfile(
       'openrouter-test',
-      'https://openrouter.ai/api',
+      preset!.baseUrl,
       'sk-or-testkey',
       { default: 'anthropic/claude-opus-4.5', opus: 'anthropic/claude-opus-4.5', sonnet: 'anthropic/claude-opus-4.5', haiku: 'anthropic/claude-opus-4.5' }
     );
@@ -144,8 +149,9 @@ describe('profile-writer Anthropic direct', () => {
     const settingsPath = path.join(tempHome, '.ccs', 'openrouter-test.settings.json');
     const settings = JSON.parse(fs.readFileSync(settingsPath, 'utf8'));
 
-    // OpenRouter: proxy mode with ANTHROPIC_API_KEY explicitly blank
+    // OpenRouter: proxy mode with ANTHROPIC_API_KEY explicitly blank and baseUrl without /v1
     expect(settings.env.ANTHROPIC_BASE_URL).toBe('https://openrouter.ai/api');
+    expect(`${settings.env.ANTHROPIC_BASE_URL}/v1/messages`).toBe('https://openrouter.ai/api/v1/messages');
     expect(settings.env.ANTHROPIC_AUTH_TOKEN).toBe('sk-or-testkey');
     expect(settings.env.ANTHROPIC_API_KEY).toBe('');
   });
diff --git a/tests/unit/api/provider-presets.test.ts b/tests/unit/api/provider-presets.test.ts
index d90ff2eb..69bb4501 100644
--- a/tests/unit/api/provider-presets.test.ts
+++ b/tests/unit/api/provider-presets.test.ts
@@ -1,8 +1,6 @@
-import { existsSync, mkdtempSync, readFileSync, rmSync } from 'fs';
-import { tmpdir } from 'os';
-import { join, resolve } from 'path';
+import { existsSync } from 'fs';
+import { resolve } from 'path';
 import { describe, expect, it } from 'bun:test';
-import { createApiProfile } from '../../../src/api/services/profile-writer';
 import {
   PROVIDER_PRESETS,
   getPresetById,
@@ -123,38 +121,6 @@ describe('provider-presets', () => {
     expect(finalEndpoint).not.toContain('/v1/v1/');
   });
 
-  it('generates an OpenRouter profile whose ANTHROPIC_BASE_URL does not duplicate /v1 (#1728)', () => {
-    const preset = getPresetById('openrouter');
-    expect(preset).toBeDefined();
-    const tempHome = mkdtempSync(join(tmpdir(), 'ccs-openrouter-tdd-'));
-    const prevCcsHome = process.env.CCS_HOME;
-    process.env.CCS_HOME = tempHome;
-    try {
-      const result = createApiProfile(
-        'openrouter-tdd',
-        preset!.baseUrl,
-        'sk-or-test-key',
-        {
-          default: preset!.defaultModel,
-          opus: preset!.defaultModel,
-          sonnet: preset!.defaultModel,
-          haiku: preset!.defaultModel,
-        }
-      );
-      expect(result.success).toBe(true);
-      const settings = JSON.parse(
-        readFileSync(join(tempHome, '.ccs', 'openrouter-tdd.settings.json'), 'utf8')
-      );
-      expect(settings.env.ANTHROPIC_BASE_URL).toBe('https://openrouter.ai/api');
-      expect(`${settings.env.ANTHROPIC_BASE_URL}/v1/messages`).toBe(
-        'https://openrouter.ai/api/v1/messages'
-      );
-    } finally {
-      process.env.CCS_HOME = prevCcsHome;
-      rmSync(tempHome, { recursive: true, force: true });
-    }
-  });
-
   it('keeps Anthropic direct last in the recommended preset order and reuses the Claude logo', () => {
     const recommendedPresetIds = PROVIDER_PRESETS.filter(
       (preset) => preset.category === 'recommended'