diff --git a/.changeset/fluffy-flowers-grab.md b/.changeset/fluffy-flowers-grab.md
new file mode 100644
index 00000000000..7fe2f3b1d75
--- /dev/null
+++ b/.changeset/fluffy-flowers-grab.md
@@ -0,0 +1,5 @@
+---
+'@aws-amplify/ui-react-ai': patch
+---
+
+fix(ui-react-ai): Addressing cross-browser inconsistencies in AIConversation IME input handling
diff --git a/packages/react-ai/src/components/AIConversation/views/default/Form.tsx b/packages/react-ai/src/components/AIConversation/views/default/Form.tsx
index 8f7aaadaf92..930688a8007 100644
--- a/packages/react-ai/src/components/AIConversation/views/default/Form.tsx
+++ b/packages/react-ai/src/components/AIConversation/views/default/Form.tsx
@@ -110,7 +110,21 @@ export const Form: Required<ControlsContextProps>['Form'] = ({
           value={input?.text ?? ''}
           testId="text-input"
           onCompositionStart={() => setComposing(true)}
-          onCompositionEnd={() => setComposing(false)}
+          onCompositionUpdate={(e) => {
+            const composedText = e?.currentTarget?.value || '';
+            setInput?.((prevValue) => ({
+              ...prevValue,
+              text: composedText,
+            }));
+          }}
+          onCompositionEnd={(e) => {
+            setComposing(false);
+            const composedText = e?.currentTarget?.value || '';
+            setInput?.((prevValue) => ({
+              ...prevValue,
+              text: composedText,
+            }));
+          }}
           onKeyDown={(e) => {
             // Submit on enter key if shift is not pressed also
             const shouldSubmit = !e.shiftKey && e.key === 'Enter' && !composing;
diff --git a/packages/react-ai/src/components/AIConversation/views/default/__tests__/Form.spec.tsx b/packages/react-ai/src/components/AIConversation/views/default/__tests__/Form.spec.tsx
index 121d2e23131..4be0c75488e 100644
--- a/packages/react-ai/src/components/AIConversation/views/default/__tests__/Form.spec.tsx
+++ b/packages/react-ai/src/components/AIConversation/views/default/__tests__/Form.spec.tsx
@@ -1,11 +1,21 @@
+/* eslint-disable no-console */
 import React from 'react';
-import { render, screen, fireEvent, waitFor } from '@testing-library/react';
+import {
+  render,
+  screen,
+  fireEvent,
+  waitFor,
+  within,
+} from '@testing-library/react';
 import { Form } from '../Form';
 
 const setInput = jest.fn();
 const input = {};
 const handleSubmit = jest.fn();
 const onValidate = jest.fn();
+const onCompositionStart = jest.fn();
+const onCompositionEnd = jest.fn();
+const onKeyDown = jest.fn();
 
 const defaultProps = {
   allowAttachments: true,
@@ -13,6 +23,9 @@ const defaultProps = {
   input,
   handleSubmit,
   onValidate,
+  onCompositionStart,
+  onCompositionEnd,
+  onKeyDown,
 };
 
 describe('Form', () => {
@@ -57,4 +70,54 @@ describe('Form', () => {
     expect(fileInput.files).not.toBeNull();
     expect(fileInput.files![0]).toStrictEqual(testFile);
   });
+
+  it('updates IME input with composition completion', async () => {
+    const input = { currentTarget: { value: '你' } };
+    const updatedInput = { currentTarget: { value: '你好' } };
+
+    const result = render(<Form {...defaultProps} />);
+    expect(result.container).toBeDefined();
+
+    const textFieldContainer = screen.getByTestId('text-input');
+
+    const textInput =
+      textFieldContainer.querySelector('textarea') ??
+      within(textFieldContainer).getByRole('textbox');
+
+    await waitFor(() => {
+      fireEvent.compositionStart(textInput);
+      fireEvent.compositionEnd(textInput, input);
+    });
+
+    await waitFor(() => {
+      fireEvent.compositionEnd(textInput, updatedInput);
+    });
+
+    expect(setInput).toHaveBeenCalledTimes(2);
+  });
+
+  it('updates IME input with composition update', async () => {
+    const input = { currentTarget: { value: 'しあわせ' } };
+    const updatedInput = { currentTarget: { value: '幸せならおkです' } };
+
+    const result = render(<Form {...defaultProps} />);
+    expect(result.container).toBeDefined();
+
+    const textFieldContainer = screen.getByTestId('text-input');
+
+    const textInput =
+      textFieldContainer.querySelector('textarea') ??
+      within(textFieldContainer).getByRole('textbox');
+
+    await waitFor(() => {
+      fireEvent.compositionStart(textInput);
+      fireEvent.compositionUpdate(textInput, input);
+    });
+
+    await waitFor(() => {
+      fireEvent.compositionUpdate(textInput, updatedInput);
+    });
+
+    expect(setInput).toHaveBeenCalledTimes(2);
+  });
 });