diff --git a/cypress/e2e/create.cy.js b/cypress/e2e/create.cy.js
index d2fffde30a8..6fcddc5a7fe 100644
--- a/cypress/e2e/create.cy.js
+++ b/cypress/e2e/create.cy.js
@@ -15,6 +15,38 @@ describe('Create Page', () => {
         CreatePage.waitUntilVisible();
     });
 
+    it('should validate unique fields', () => {
+        CreatePage.logout();
+        LoginPage.login('admin', 'password');
+
+        UserCreatePage.navigate();
+        UserCreatePage.setValues([
+            {
+                type: 'input',
+                name: 'name',
+                value: 'Annamarie Mayer',
+            },
+        ]);
+        cy.get(UserCreatePage.elements.input('name')).blur();
+
+        cy.get(CreatePage.elements.nameError)
+            .should('exist')
+            .contains('Must be unique', { timeout: 10000 });
+
+        UserCreatePage.setValues([
+            {
+                type: 'input',
+                name: 'name',
+                value: 'Annamarie NotMayer',
+            },
+        ]);
+        cy.get(UserCreatePage.elements.input('name')).blur();
+
+        cy.get(CreatePage.elements.nameError)
+            .should('exist')
+            .should('not.contain', 'Must be unique', { timeout: 10000 });
+    });
+
     it('should show the correct title in the appBar', () => {
         cy.get(CreatePage.elements.title).contains('Create Post');
     });
diff --git a/cypress/support/CreatePage.js b/cypress/support/CreatePage.js
index 584ef4ef0ac..80a517c7948 100644
--- a/cypress/support/CreatePage.js
+++ b/cypress/support/CreatePage.js
@@ -23,7 +23,7 @@ export default url => ({
         title: '#react-admin-title',
         userMenu: 'button[aria-label="Profile"]',
         logout: '.logout',
-        nameError: '#name-helper-text',
+        nameError: '.MuiFormHelperText-root',
     },
 
     navigate() {
diff --git a/docs/Upgrade.md b/docs/Upgrade.md
index 83c652f94c7..431177638e2 100644
--- a/docs/Upgrade.md
+++ b/docs/Upgrade.md
@@ -932,6 +932,14 @@ The `BulkActionProps` has been removed as it did not contain any prop. You can s
 
 The `data-generator-retail` package has been updated to provide types for all its records. In the process, we renamed the `commands` resource to `orders`. Accordingly, the `nb_commands` property of the `customers` resource has been renamed to `nb_orders` and the `command_id` property of the `invoices` and `reviews` resources has been renamed to `order_id`.
 
+## Inputs default ids are auto-generated
+
+In previous versions, the input default id was the source of the input. In v5, inputs defaults ids are auto-generated with [React useId()](https://react.dev/reference/react/useId).
+
+**Tip:** You still can pass an id as prop of any [react-admin input](./Inputs.md) or use a [reference](https://fr.react.dev/reference/react/useRef).
+
+If you were using inputs ids in your tests, you should pass your own id to the dedicated input.
+
 ## `<SimpleFormIterator>` No Longer Clones Its Buttons
 
 `<SimpleFormIterator>` used to clones the add, remove and reorder buttons and inject some props to them such as `onClick` and `className`.
diff --git a/docs/useInput.md b/docs/useInput.md
index 79fae12f116..bb41d2d1fbb 100644
--- a/docs/useInput.md
+++ b/docs/useInput.md
@@ -41,16 +41,16 @@ const TitleInput = ({ source, label }) => {
 
 ## Props
 
-| Prop           | Required | Type                           | Default | Description                                                       |
-|----------------|----------|--------------------------------|---------|-------------------------------------------------------------------|
-| `source`       | Required | `string`                       | -       | The name of the field in the record                               |
-| `defaultValue` | Optional | `any`                          | -       | The default value of the input                                    |
-| `format`       | Optional | `Function`                     | -       | A function to format the value from the record to the input value |
-| `parse`        | Optional | `Function`                     | -       | A function to parse the value from the input to the record value  |
-| `validate`     | Optional | `Function` &#124; `Function[]` | -       | A function or an array of functions to validate the input value   |
-| `id`           | Optional | `string`                       | -       | The id of the input                                               |
-| `onChange`     | Optional | `Function`                     | -       | A function to call when the input value changes                   |
-| `onBlur`       | Optional | `Function`                     | -       | A function to call when the input is blurred                      |
+| Prop           | Required | Type                           | Default          | Description                                                       |
+|----------------|----------|--------------------------------|----------------- |-------------------------------------------------------------------|
+| `source`       | Required | `string`                       | -                | The name of the field in the record                               |
+| `defaultValue` | Optional | `any`                          | -                | The default value of the input                                    |
+| `format`       | Optional | `Function`                     | -                | A function to format the value from the record to the input value |
+| `parse`        | Optional | `Function`                     | -                | A function to parse the value from the input to the record value  |
+| `validate`     | Optional | `Function` &#124; `Function[]` | -                | A function or an array of functions to validate the input value   |
+| `id`           | Optional | `string`                       | `auto-generated` | The id of the input                                               |
+| `onChange`     | Optional | `Function`                     | -                | A function to call when the input value changes                   |
+| `onBlur`       | Optional | `Function`                     | -                | A function to call when the input is blurred                      |
 
 Additional props are passed to [react-hook-form's `useController` hook](https://react-hook-form.com/docs/usecontroller).
 
diff --git a/packages/ra-core/src/form/useInput.spec.tsx b/packages/ra-core/src/form/useInput.spec.tsx
index 603416bdb6e..cfdcc35330c 100644
--- a/packages/ra-core/src/form/useInput.spec.tsx
+++ b/packages/ra-core/src/form/useInput.spec.tsx
@@ -58,7 +58,7 @@ describe('useInput', () => {
             </CoreAdminContext>
         );
 
-        expect(inputProps.id).toEqual('title');
+        expect(inputProps.id).toEqual(':r0:');
         expect(inputProps.isRequired).toEqual(true);
         expect(inputProps.field).toBeDefined();
         expect(inputProps.field.name).toEqual('title');
diff --git a/packages/ra-core/src/form/useInput.stories.tsx b/packages/ra-core/src/form/useInput.stories.tsx
new file mode 100644
index 00000000000..130bef255d9
--- /dev/null
+++ b/packages/ra-core/src/form/useInput.stories.tsx
@@ -0,0 +1,43 @@
+import * as React from 'react';
+import { CoreAdminContext } from '../core';
+import { Form } from './Form';
+import { useInput } from './useInput';
+
+export default {
+    title: 'ra-core/form/useInput',
+};
+
+const Input = ({ source }) => {
+    const { id, field, fieldState } = useInput({ source });
+
+    return (
+        <label htmlFor={id}>
+            {id}: <input id={id} {...field} />
+            {fieldState.error && <span>{fieldState.error.message}</span>}
+        </label>
+    );
+};
+
+export const Basic = () => {
+    const [submittedData, setSubmittedData] = React.useState<any>();
+    return (
+        <CoreAdminContext>
+            <Form onSubmit={data => setSubmittedData(data)}>
+                <div
+                    style={{
+                        display: 'flex',
+                        flexDirection: 'column',
+                        gap: '1em',
+                        marginBottom: '1em',
+                    }}
+                >
+                    <Input source="field1" />
+                    <Input source="field2" />
+                    <Input source="field3" />
+                </div>
+                <button type="submit">Submit</button>
+            </Form>
+            <pre>{JSON.stringify(submittedData, null, 2)}</pre>
+        </CoreAdminContext>
+    );
+};
diff --git a/packages/ra-core/src/form/useInput.ts b/packages/ra-core/src/form/useInput.ts
index f0b56bf4356..9e0eca30db3 100644
--- a/packages/ra-core/src/form/useInput.ts
+++ b/packages/ra-core/src/form/useInput.ts
@@ -1,4 +1,4 @@
-import { ReactElement, useEffect } from 'react';
+import { ReactElement, useEffect, useId } from 'react';
 import {
     ControllerFieldState,
     ControllerRenderProps,
@@ -44,6 +44,7 @@ export const useInput = <ValueType = any>(
     const formGroupName = useFormGroupContext();
     const formGroups = useFormGroups();
     const record = useRecordContext();
+    const defaultId = useId();
 
     if (
         !source &&
@@ -132,7 +133,7 @@ export const useInput = <ValueType = any>(
     };
 
     return {
-        id: id || finalSource,
+        id: id || defaultId,
         field,
         fieldState,
         formState,
diff --git a/packages/ra-input-rich-text/src/RichTextInput.spec.tsx b/packages/ra-input-rich-text/src/RichTextInput.spec.tsx
index 9b94f24b133..8c353d17371 100644
--- a/packages/ra-input-rich-text/src/RichTextInput.spec.tsx
+++ b/packages/ra-input-rich-text/src/RichTextInput.spec.tsx
@@ -9,7 +9,7 @@ describe('<RichTextInput />', () => {
         const { container, rerender } = render(<Basic record={record} />);
 
         await waitFor(() => {
-            expect(container.querySelector('#body')?.innerHTML).toEqual(
+            expect(container.querySelector('.ProseMirror')?.innerHTML).toEqual(
                 '<h1>Hello world!</h1>'
             );
         });
@@ -18,7 +18,7 @@ describe('<RichTextInput />', () => {
         rerender(<Basic record={newRecord} />);
 
         await waitFor(() => {
-            expect(container.querySelector('#body')?.innerHTML).toEqual(
+            expect(container.querySelector('.ProseMirror')?.innerHTML).toEqual(
                 '<h1>Goodbye world!</h1>'
             );
         });
diff --git a/packages/ra-ui-materialui/src/input/RadioButtonGroupInput.spec.tsx b/packages/ra-ui-materialui/src/input/RadioButtonGroupInput.spec.tsx
index 664ba9531f6..5c9374b466f 100644
--- a/packages/ra-ui-materialui/src/input/RadioButtonGroupInput.spec.tsx
+++ b/packages/ra-ui-materialui/src/input/RadioButtonGroupInput.spec.tsx
@@ -86,9 +86,10 @@ describe('<RadioButtonGroupInput />', () => {
         );
         expect(screen.queryByText('People')).not.toBeNull();
         const input1 = screen.getByLabelText('Leo Tolstoi');
-        expect(input1.id).toBe('type_123');
+        expect(input1.id).toMatch(/:r\d:/);
         const input2 = screen.getByLabelText('Jane Austen');
-        expect(input2.id).toBe('type_456');
+        expect(input2.id).toMatch(/:r\d:/);
+        expect(input2.id).not.toEqual(input1.id);
     });
 
     it('should trigger custom onChange when clicking radio button', async () => {