diff --git a/.changeset/tame-garlics-help.md b/.changeset/tame-garlics-help.md
new file mode 100644
index 000000000..faabcd2f6
--- /dev/null
+++ b/.changeset/tame-garlics-help.md
@@ -0,0 +1,5 @@
+---
+"@assistant-ui/react": patch
+---
+
+fix: do not capture enter key during IME composition events
diff --git a/packages/react/src/primitives/composer/ComposerInput.tsx b/packages/react/src/primitives/composer/ComposerInput.tsx
index bf6e1234b..9733310ef 100644
--- a/packages/react/src/primitives/composer/ComposerInput.tsx
+++ b/packages/react/src/primitives/composer/ComposerInput.tsx
@@ -62,6 +62,9 @@ export const ComposerPrimitiveInput = forwardRef<
     const handleKeyPress = (e: KeyboardEvent) => {
       if (isDisabled) return;
 
+      // ignore IME composition events
+      if (e.nativeEvent.isComposing) return;
+
       if (e.key === "Enter" && e.shiftKey === false) {
         const { isRunning } = useThread.getState();