diff --git a/Classes/Provider/OpenAiProvider.php b/Classes/Provider/OpenAiProvider.php
index 9124dc70b..21727d62a 100644
--- a/Classes/Provider/OpenAiProvider.php
+++ b/Classes/Provider/OpenAiProvider.php
@@ -96,7 +96,7 @@ public function chatCompletion(array $messages, array $options = []): Completion
             'model' => $model,
             'messages' => $messages,
             'temperature' => $this->getFloat($options, 'temperature', 0.7),
-            'max_tokens' => $this->getInt($options, 'max_tokens', 4096),
+            'max_completion_tokens' => $this->getInt($options, 'max_tokens', 4096),
         ];
 
         if (isset($options['top_p'])) {
@@ -150,7 +150,7 @@ public function chatCompletionWithTools(array $messages, array $tools, array $op
             'messages' => $messages,
             'tools' => $tools,
             'temperature' => $this->getFloat($options, 'temperature', 0.7),
-            'max_tokens' => $this->getInt($options, 'max_tokens', 4096),
+            'max_completion_tokens' => $this->getInt($options, 'max_tokens', 4096),
         ];
 
         if (isset($options['tool_choice'])) {
@@ -274,7 +274,7 @@ public function analyzeImage(array $content, array $options = []): VisionRespons
         $payload = [
             'model' => $model,
             'messages' => $messages,
-            'max_tokens' => $this->getInt($options, 'max_tokens', 4096),
+            'max_completion_tokens' => $this->getInt($options, 'max_tokens', 4096),
         ];
 
         $response = $this->sendRequest('chat/completions', $payload);
@@ -325,7 +325,7 @@ public function streamChatCompletion(array $messages, array $options = []): Gene
             'model' => $this->getString($options, 'model', $this->getDefaultModel()),
             'messages' => $messages,
             'temperature' => $this->getFloat($options, 'temperature', 0.7),
-            'max_tokens' => $this->getInt($options, 'max_tokens', 4096),
+            'max_completion_tokens' => $this->getInt($options, 'max_tokens', 4096),
             'stream' => true,
         ];
 
diff --git a/Tests/E2E/ChatCompletionWorkflowTest.php b/Tests/E2E/ChatCompletionWorkflowTest.php
index be4c00461..5df965a67 100644
--- a/Tests/E2E/ChatCompletionWorkflowTest.php
+++ b/Tests/E2E/ChatCompletionWorkflowTest.php
@@ -231,9 +231,9 @@ public function chatWithOptionsWorkflow(): void
         $requestBody = json_decode((string)$clientSetup['requests'][0]->getBody(), true);
         self::assertIsArray($requestBody);
         self::assertArrayHasKey('temperature', $requestBody);
-        self::assertArrayHasKey('max_tokens', $requestBody);
+        self::assertArrayHasKey('max_completion_tokens', $requestBody);
         self::assertEquals(0.1, $requestBody['temperature']);
-        self::assertEquals(500, $requestBody['max_tokens']);
+        self::assertEquals(500, $requestBody['max_completion_tokens']);
     }
 
     #[Test]
diff --git a/Tests/Integration/Service/LlmServiceManagerIntegrationTest.php b/Tests/Integration/Service/LlmServiceManagerIntegrationTest.php
index d585a08aa..462906e18 100644
--- a/Tests/Integration/Service/LlmServiceManagerIntegrationTest.php
+++ b/Tests/Integration/Service/LlmServiceManagerIntegrationTest.php
@@ -300,7 +300,7 @@ public function chatWithOptionsPassesThemToProvider(): void
         self::assertIsArray($body);
 
         self::assertEquals(0.5, $body['temperature']);
-        self::assertEquals(100, $body['max_tokens']);
+        self::assertEquals(100, $body['max_completion_tokens']);
     }
 
     #[Test]