diff --git a/src/Responses/Responses/Input/FunctionToolCallOutput.php b/src/Responses/Responses/Input/FunctionToolCallOutput.php
index 267e7232..6ca9a76b 100644
--- a/src/Responses/Responses/Input/FunctionToolCallOutput.php
+++ b/src/Responses/Responses/Input/FunctionToolCallOutput.php
@@ -9,7 +9,11 @@
 use OpenAI\Testing\Responses\Concerns\Fakeable;
 
 /**
- * @phpstan-type FunctionToolCallOutputType array{call_id: string, id: string, output: string, type: 'function_call_output', status: 'in_progress'|'completed'|'incompleted'}
+ * @phpstan-import-type FunctionToolCallOutputTextType from FunctionToolCallOutputText
+ * @phpstan-import-type FunctionToolCallOutputImageType from FunctionToolCallOutputImage
+ * @phpstan-import-type FunctionToolCallOutputFileType from FunctionToolCallOutputFile
+ *
+ * @phpstan-type FunctionToolCallOutputType array{call_id: string, id: string, output: string|array<int, FunctionToolCallOutputTextType|FunctionToolCallOutputImageType|FunctionToolCallOutputFileType>, type: 'function_call_output', status: 'in_progress'|'completed'|'incompleted'}
  *
  * @implements ResponseContract<FunctionToolCallOutputType>
  */
@@ -25,11 +29,12 @@ final class FunctionToolCallOutput implements ResponseContract
     /**
      * @param  'function_call_output'  $type
      * @param  'in_progress'|'completed'|'incompleted'  $status
+     * @param  string|array<int, FunctionToolCallOutputText|FunctionToolCallOutputImage|FunctionToolCallOutputFile>  $output  Output can be a string (for text/JSON) or array (for structured content like files/images)
      */
     private function __construct(
         public readonly string $callId,
         public readonly string $id,
-        public readonly string $output,
+        public readonly string|array $output,
         public readonly string $type,
         public readonly string $status,
     ) {}
@@ -39,10 +44,23 @@ private function __construct(
      */
     public static function from(array $attributes): self
     {
+        $output = $attributes['output'];
+
+        if (is_array($output)) {
+            $output = array_map(
+                fn (array $item): FunctionToolCallOutputText|FunctionToolCallOutputImage|FunctionToolCallOutputFile => match ($item['type']) {
+                    'input_text' => FunctionToolCallOutputText::from($item),
+                    'input_image' => FunctionToolCallOutputImage::from($item),
+                    'input_file' => FunctionToolCallOutputFile::from($item),
+                },
+                $output,
+            );
+        }
+
         return new self(
             callId: $attributes['call_id'],
             id: $attributes['id'],
-            output: $attributes['output'],
+            output: $output,
             type: $attributes['type'],
             status: $attributes['status'],
         );
@@ -56,7 +74,12 @@ public function toArray(): array
         return [
             'call_id' => $this->callId,
             'id' => $this->id,
-            'output' => $this->output,
+            'output' => is_array($this->output)
+                ? array_map(
+                    fn (FunctionToolCallOutputText|FunctionToolCallOutputImage|FunctionToolCallOutputFile $item): array => $item->toArray(),
+                    $this->output,
+                )
+                : $this->output,
             'type' => $this->type,
             'status' => $this->status,
         ];
diff --git a/src/Responses/Responses/Input/FunctionToolCallOutputFile.php b/src/Responses/Responses/Input/FunctionToolCallOutputFile.php
new file mode 100644
index 00000000..1e0a60fe
--- /dev/null
+++ b/src/Responses/Responses/Input/FunctionToolCallOutputFile.php
@@ -0,0 +1,63 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OpenAI\Responses\Responses\Input;
+
+use OpenAI\Contracts\ResponseContract;
+use OpenAI\Responses\Concerns\ArrayAccessible;
+use OpenAI\Testing\Responses\Concerns\Fakeable;
+
+/**
+ * @phpstan-type FunctionToolCallOutputFileType array{type: 'input_file', file_data?: string, file_id?: string, file_url?: string, filename?: string}
+ *
+ * @implements ResponseContract<FunctionToolCallOutputFileType>
+ */
+final class FunctionToolCallOutputFile implements ResponseContract
+{
+    /**
+     * @use ArrayAccessible<FunctionToolCallOutputFileType>
+     */
+    use ArrayAccessible;
+
+    use Fakeable;
+
+    /**
+     * @param  'input_file'  $type
+     */
+    private function __construct(
+        public readonly string $type,
+        public readonly ?string $fileData,
+        public readonly ?string $fileId,
+        public readonly ?string $fileUrl,
+        public readonly ?string $filename,
+    ) {}
+
+    /**
+     * @param  FunctionToolCallOutputFileType  $attributes
+     */
+    public static function from(array $attributes): self
+    {
+        return new self(
+            type: $attributes['type'],
+            fileData: $attributes['file_data'] ?? null,
+            fileId: $attributes['file_id'] ?? null,
+            fileUrl: $attributes['file_url'] ?? null,
+            filename: $attributes['filename'] ?? null,
+        );
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function toArray(): array
+    {
+        return array_filter([
+            'type' => $this->type,
+            'file_data' => $this->fileData,
+            'file_id' => $this->fileId,
+            'file_url' => $this->fileUrl,
+            'filename' => $this->filename,
+        ], fn ($value) => $value !== null);
+    }
+}
diff --git a/src/Responses/Responses/Input/FunctionToolCallOutputImage.php b/src/Responses/Responses/Input/FunctionToolCallOutputImage.php
new file mode 100644
index 00000000..cb7593f3
--- /dev/null
+++ b/src/Responses/Responses/Input/FunctionToolCallOutputImage.php
@@ -0,0 +1,60 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OpenAI\Responses\Responses\Input;
+
+use OpenAI\Contracts\ResponseContract;
+use OpenAI\Responses\Concerns\ArrayAccessible;
+use OpenAI\Testing\Responses\Concerns\Fakeable;
+
+/**
+ * @phpstan-type FunctionToolCallOutputImageType array{type: 'input_image', detail?: string, file_id?: string, image_url?: string}
+ *
+ * @implements ResponseContract<FunctionToolCallOutputImageType>
+ */
+final class FunctionToolCallOutputImage implements ResponseContract
+{
+    /**
+     * @use ArrayAccessible<FunctionToolCallOutputImageType>
+     */
+    use ArrayAccessible;
+
+    use Fakeable;
+
+    /**
+     * @param  'input_image'  $type
+     */
+    private function __construct(
+        public readonly string $type,
+        public readonly ?string $detail,
+        public readonly ?string $fileId,
+        public readonly ?string $imageUrl,
+    ) {}
+
+    /**
+     * @param  FunctionToolCallOutputImageType  $attributes
+     */
+    public static function from(array $attributes): self
+    {
+        return new self(
+            type: $attributes['type'],
+            detail: $attributes['detail'] ?? null,
+            fileId: $attributes['file_id'] ?? null,
+            imageUrl: $attributes['image_url'] ?? null,
+        );
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function toArray(): array
+    {
+        return array_filter([
+            'type' => $this->type,
+            'detail' => $this->detail,
+            'file_id' => $this->fileId,
+            'image_url' => $this->imageUrl,
+        ], fn ($value) => $value !== null);
+    }
+}
diff --git a/src/Responses/Responses/Input/FunctionToolCallOutputText.php b/src/Responses/Responses/Input/FunctionToolCallOutputText.php
new file mode 100644
index 00000000..694428ab
--- /dev/null
+++ b/src/Responses/Responses/Input/FunctionToolCallOutputText.php
@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OpenAI\Responses\Responses\Input;
+
+use OpenAI\Contracts\ResponseContract;
+use OpenAI\Responses\Concerns\ArrayAccessible;
+use OpenAI\Testing\Responses\Concerns\Fakeable;
+
+/**
+ * @phpstan-type FunctionToolCallOutputTextType array{text: string, type: 'input_text'}
+ *
+ * @implements ResponseContract<FunctionToolCallOutputTextType>
+ */
+final class FunctionToolCallOutputText implements ResponseContract
+{
+    /**
+     * @use ArrayAccessible<FunctionToolCallOutputTextType>
+     */
+    use ArrayAccessible;
+
+    use Fakeable;
+
+    /**
+     * @param  'input_text'  $type
+     */
+    private function __construct(
+        public readonly string $text,
+        public readonly string $type
+    ) {}
+
+    /**
+     * @param  FunctionToolCallOutputTextType  $attributes
+     */
+    public static function from(array $attributes): self
+    {
+        return new self(
+            text: $attributes['text'],
+            type: $attributes['type'],
+        );
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function toArray(): array
+    {
+        return [
+            'text' => $this->text,
+            'type' => $this->type,
+        ];
+    }
+}