diff --git a/src/Responses/Threads/Runs/Steps/Delta/ThreadRunStepDeltaResponse.php b/src/Responses/Threads/Runs/Steps/Delta/ThreadRunStepDeltaResponse.php
index 9b7d20f4..8490d7b6 100644
--- a/src/Responses/Threads/Runs/Steps/Delta/ThreadRunStepDeltaResponse.php
+++ b/src/Responses/Threads/Runs/Steps/Delta/ThreadRunStepDeltaResponse.php
@@ -21,7 +21,7 @@ final class ThreadRunStepDeltaResponse implements ResponseContract
     use Fakeable;
 
     private function __construct(
-        public string $id,
+        public ?string $id,
         public string $object,
         public ThreadRunStepDeltaObject $delta,
     ) {
@@ -35,7 +35,7 @@ private function __construct(
     public static function from(array $attributes): self
     {
         return new self(
-            $attributes['id'],
+            $attributes['id'] ?? null,
             $attributes['object'],
             ThreadRunStepDeltaObject::from($attributes['delta']),
         );
diff --git a/src/Responses/Threads/Runs/Steps/ThreadRunStepResponseFunction.php b/src/Responses/Threads/Runs/Steps/ThreadRunStepResponseFunction.php
index ac171aa8..78e36bb0 100644
--- a/src/Responses/Threads/Runs/Steps/ThreadRunStepResponseFunction.php
+++ b/src/Responses/Threads/Runs/Steps/ThreadRunStepResponseFunction.php
@@ -21,7 +21,7 @@ final class ThreadRunStepResponseFunction implements ResponseContract
     use Fakeable;
 
     private function __construct(
-        public string $name,
+        public ?string $name,
         public string $arguments,
         public ?string $output,
     ) {
@@ -35,7 +35,7 @@ private function __construct(
     public static function from(array $attributes): self
     {
         return new self(
-            $attributes['name'],
+            $attributes['name'] ?? null,
             $attributes['arguments'],
             $attributes['output'] ?? null,
         );
diff --git a/src/Responses/Threads/Runs/Steps/ThreadRunStepResponseFunctionToolCall.php b/src/Responses/Threads/Runs/Steps/ThreadRunStepResponseFunctionToolCall.php
index 4f221b55..e602561c 100644
--- a/src/Responses/Threads/Runs/Steps/ThreadRunStepResponseFunctionToolCall.php
+++ b/src/Responses/Threads/Runs/Steps/ThreadRunStepResponseFunctionToolCall.php
@@ -24,7 +24,7 @@ final class ThreadRunStepResponseFunctionToolCall implements ResponseContract
      * @param  'function'  $type
      */
     private function __construct(
-        public string $id,
+        public ?string $id,
         public string $type,
         public ThreadRunStepResponseFunction $function,
     ) {
@@ -38,7 +38,7 @@ private function __construct(
     public static function from(array $attributes): self
     {
         return new self(
-            $attributes['id'],
+            $attributes['id'] ?? null,
             $attributes['type'],
             ThreadRunStepResponseFunction::from($attributes['function']),
         );