diff --git a/client/src/components/Chat/Menus/Endpoints/components/SpecIcon.tsx b/client/src/components/Chat/Menus/Endpoints/components/SpecIcon.tsx
index 1a3d9ca480..6eef7656c3 100644
--- a/client/src/components/Chat/Menus/Endpoints/components/SpecIcon.tsx
+++ b/client/src/components/Chat/Menus/Endpoints/components/SpecIcon.tsx
@@ -15,7 +15,7 @@ type IconType = (props: IconMapProps) => React.JSX.Element;
 
 const SpecIcon: React.FC<SpecIconProps> = ({ currentSpec, endpointsConfig }) => {
   const iconURL = getModelSpecIconURL(currentSpec);
-  const { endpoint } = currentSpec.preset;
+  const endpoint = currentSpec.preset?.endpoint;
   const endpointIconURL = getEndpointField(endpointsConfig, endpoint, 'iconURL');
   const iconKey = getIconKey({ endpoint, endpointsConfig, endpointIconURL });
   let Icon: IconType;
diff --git a/client/src/components/Chat/Menus/Endpoints/components/__tests__/SpecIcon.test.tsx b/client/src/components/Chat/Menus/Endpoints/components/__tests__/SpecIcon.test.tsx
new file mode 100644
index 0000000000..2549d8c5e3
--- /dev/null
+++ b/client/src/components/Chat/Menus/Endpoints/components/__tests__/SpecIcon.test.tsx
@@ -0,0 +1,68 @@
+import { render, screen } from '@testing-library/react';
+import { EModelEndpoint } from 'librechat-data-provider';
+import type { TModelSpec, TEndpointsConfig } from 'librechat-data-provider';
+import SpecIcon from '../SpecIcon';
+
+jest.mock('~/hooks/Endpoint/Icons', () => {
+  const React = jest.requireActual<typeof import('react')>('react');
+  const createIcon =
+    (iconKey: string) =>
+    ({ endpoint, iconURL }: { endpoint?: string | null; iconURL?: string }) =>
+      React.createElement('span', {
+        'data-testid': 'endpoint-icon',
+        'data-icon-key': iconKey,
+        'data-endpoint': endpoint ?? '',
+        'data-icon-url': iconURL ?? '',
+      });
+
+  return {
+    icons: {
+      google: createIcon('google'),
+      openAI: createIcon('openAI'),
+      unknown: createIcon('unknown'),
+    },
+  };
+});
+
+jest.mock('~/components/Endpoints/URLIcon', () => {
+  const React = jest.requireActual<typeof import('react')>('react');
+  return {
+    URLIcon: ({ iconURL, endpoint }: { iconURL: string; endpoint?: string }) =>
+      React.createElement('span', {
+        'data-testid': 'url-icon',
+        'data-icon-url': iconURL,
+        'data-endpoint': endpoint ?? '',
+      }),
+  };
+});
+
+describe('SpecIcon', () => {
+  const endpointsConfig = {} as TEndpointsConfig;
+
+  it('renders the explicit spec icon when runtime spec data is missing preset', () => {
+    const currentSpec = {
+      name: 'gemini-test',
+      label: 'Gemini Test',
+      iconURL: EModelEndpoint.google,
+    } as TModelSpec;
+
+    render(<SpecIcon currentSpec={currentSpec} endpointsConfig={endpointsConfig} />);
+
+    expect(screen.getByTestId('endpoint-icon')).toHaveAttribute(
+      'data-icon-key',
+      EModelEndpoint.google,
+    );
+    expect(screen.getByTestId('endpoint-icon')).toHaveAttribute('data-endpoint', '');
+  });
+
+  it('falls back to the unknown icon when runtime spec data has no icon or preset', () => {
+    const currentSpec = {
+      name: 'gemini-test',
+      label: 'Gemini Test',
+    } as TModelSpec;
+
+    render(<SpecIcon currentSpec={currentSpec} endpointsConfig={endpointsConfig} />);
+
+    expect(screen.getByTestId('endpoint-icon')).toHaveAttribute('data-icon-key', 'unknown');
+  });
+});
diff --git a/client/src/utils/__tests__/getModelSpecIconURL.test.ts b/client/src/utils/__tests__/getModelSpecIconURL.test.ts
new file mode 100644
index 0000000000..fdab800e92
--- /dev/null
+++ b/client/src/utils/__tests__/getModelSpecIconURL.test.ts
@@ -0,0 +1,53 @@
+import { EModelEndpoint } from 'librechat-data-provider';
+import type { TModelSpec } from 'librechat-data-provider';
+import { getModelSpecIconURL } from '../endpoints';
+
+describe('getModelSpecIconURL', () => {
+  it('returns the explicit model spec icon before preset values', () => {
+    const modelSpec = {
+      name: 'gemini-test',
+      label: 'Gemini Test',
+      iconURL: EModelEndpoint.google,
+      preset: {
+        endpoint: EModelEndpoint.openAI,
+        iconURL: EModelEndpoint.anthropic,
+      },
+    } as TModelSpec;
+
+    expect(getModelSpecIconURL(modelSpec)).toBe(EModelEndpoint.google);
+  });
+
+  it('falls back to the preset icon URL when no spec icon is defined', () => {
+    const modelSpec = {
+      name: 'gemini-test',
+      label: 'Gemini Test',
+      preset: {
+        endpoint: EModelEndpoint.google,
+        iconURL: EModelEndpoint.openAI,
+      },
+    } as TModelSpec;
+
+    expect(getModelSpecIconURL(modelSpec)).toBe(EModelEndpoint.openAI);
+  });
+
+  it('falls back to the preset endpoint when no icon URL is defined', () => {
+    const modelSpec = {
+      name: 'gemini-test',
+      label: 'Gemini Test',
+      preset: {
+        endpoint: EModelEndpoint.google,
+      },
+    } as TModelSpec;
+
+    expect(getModelSpecIconURL(modelSpec)).toBe(EModelEndpoint.google);
+  });
+
+  it('returns an empty icon when a runtime model spec is missing preset data', () => {
+    const modelSpec = {
+      name: 'gemini-test',
+      label: 'Gemini Test',
+    } as TModelSpec;
+
+    expect(getModelSpecIconURL(modelSpec)).toBe('');
+  });
+});
diff --git a/client/src/utils/endpoints.ts b/client/src/utils/endpoints.ts
index a27f71b8e9..1d922744eb 100644
--- a/client/src/utils/endpoints.ts
+++ b/client/src/utils/endpoints.ts
@@ -335,12 +335,9 @@ export function mergeQuerySettingsWithSpec(
   };
 }
 
-/** Gets the default spec iconURL by order or definition.
- *
- * First, the admin defined default, then last selected spec, followed by first spec
- */
+/** Gets the model spec iconURL by explicit icon, preset icon, then preset endpoint. */
 export function getModelSpecIconURL(modelSpec: t.TModelSpec) {
-  return modelSpec.iconURL ?? modelSpec.preset.iconURL ?? modelSpec.preset.endpoint ?? '';
+  return modelSpec.iconURL ?? modelSpec.preset?.iconURL ?? modelSpec.preset?.endpoint ?? '';
 }
 
 /** Gets the default frontend-facing endpoint, dependent on iconURL definition.