diff --git a/.changeset/gold-zoos-smell.md b/.changeset/gold-zoos-smell.md
new file mode 100644
index 000000000000..ae43a478b631
--- /dev/null
+++ b/.changeset/gold-zoos-smell.md
@@ -0,0 +1,5 @@
+---
+'@ai-sdk/openai': patch
+---
+
+Fix openai file_search query param to make it optional
diff --git a/packages/openai/src/tool/file-search.ts b/packages/openai/src/tool/file-search.ts
index af508aad897e..06ac6b42a600 100644
--- a/packages/openai/src/tool/file-search.ts
+++ b/packages/openai/src/tool/file-search.ts
@@ -32,7 +32,7 @@ export const fileSearch = createProviderDefinedToolFactory<
     /**
      * The search query to execute.
      */
-    query: string;
+    query?: string;
   },
   {
     /**
@@ -70,6 +70,6 @@ export const fileSearch = createProviderDefinedToolFactory<
   id: 'openai.file_search',
   name: 'file_search',
   inputSchema: z.object({
-    query: z.string(),
+    query: z.string().optional(),
   }),
 });