diff --git a/plugins/promptfoo/src/generator/config-filename.test.ts b/plugins/promptfoo/src/generator/config-filename.test.ts
new file mode 100644
index 0000000..436322b
--- /dev/null
+++ b/plugins/promptfoo/src/generator/config-filename.test.ts
@@ -0,0 +1,36 @@
+import * as fs from 'node:fs';
+import * as os from 'node:os';
+import * as path from 'node:path';
+
+import { afterEach, describe, expect, it } from 'vitest';
+
+import { generateConfig } from './config.js';
+
+const tempDirs: string[] = [];
+
+afterEach(() => {
+  for (const dir of tempDirs.splice(0)) {
+    fs.rmSync(dir, { recursive: true, force: true });
+  }
+});
+
+describe('generateConfig filename handling', () => {
+  it('keeps the requested filename while writing a stable verify config alias', () => {
+    const outputDir = fs.mkdtempSync(path.join(os.tmpdir(), 'crabcode-config-'));
+    tempDirs.push(outputDir);
+
+    const generated = generateConfig({
+      description: 'Custom filename config',
+      providerType: 'http',
+      providerConfig: { url: 'https://example.com', method: 'GET' },
+      outputDir,
+      filename: 'custom-config.yaml',
+    });
+
+    expect(generated.filePath).toBe(path.join(outputDir, 'custom-config.yaml'));
+    expect(generated.verifyPath).toBe('promptfooconfig.yaml');
+    expect(fs.readFileSync(generated.filePath, 'utf-8')).toBe(
+      fs.readFileSync(path.join(outputDir, generated.verifyPath), 'utf-8')
+    );
+  });
+});
diff --git a/plugins/promptfoo/src/generator/config-outputdir.test.ts b/plugins/promptfoo/src/generator/config-outputdir.test.ts
index 0fa55c2..fa5fe05 100644
--- a/plugins/promptfoo/src/generator/config-outputdir.test.ts
+++ b/plugins/promptfoo/src/generator/config-outputdir.test.ts
@@ -28,7 +28,7 @@ describe('generateConfig output paths', () => {
     });
 
     expect(generated.filePath).toBe(path.join(outputDir, 'nested-config.yaml'));
-    expect(generated.verifyPath).toBe('nested-config.yaml');
+    expect(generated.verifyPath).toBe('promptfooconfig.yaml');
     expect(fs.existsSync(generated.filePath)).toBe(true);
   });
 });
diff --git a/plugins/promptfoo/src/generator/config.ts b/plugins/promptfoo/src/generator/config.ts
index 34b4e33..eb90677 100644
--- a/plugins/promptfoo/src/generator/config.ts
+++ b/plugins/promptfoo/src/generator/config.ts
@@ -25,6 +25,8 @@ export interface GeneratedConfig {
   envVars: Record<string, string>;
 }
 
+const DEFAULT_CONFIG_FILENAME = 'promptfooconfig.yaml';
+
 /**
  * Generate a promptfoo YAML config
  */
@@ -35,7 +37,7 @@ export function generateConfig(options: GenerateConfigOptions): GeneratedConfig
     providerConfig,
     envVars = {},
     outputDir = '.',
-    filename = 'promptfooconfig.yaml',
+    filename = DEFAULT_CONFIG_FILENAME,
   } = options;
 
   // Validate providerConfig has required fields for http provider
@@ -101,11 +103,16 @@ ${Object.entries(envVars).map(([k, v]) => `#   ${k}: ${v}`).join('\n') || '#   (
   // Write the file
   const filePath = path.join(outputDir, filename);
   fs.writeFileSync(filePath, fullYaml, 'utf-8');
+  const verifyPath = DEFAULT_CONFIG_FILENAME;
+
+  if (verifyPath !== filename) {
+    fs.writeFileSync(path.join(outputDir, verifyPath), fullYaml, 'utf-8');
+  }
 
   return {
     yaml: fullYaml,
     filePath,
-    verifyPath: filename,
+    verifyPath,
     envVars,
   };
 }