diff --git a/lib/TaskProcessing/SummaryProvider.php b/lib/TaskProcessing/SummaryProvider.php
index a9cf3d5c..9356e134 100644
--- a/lib/TaskProcessing/SummaryProvider.php
+++ b/lib/TaskProcessing/SummaryProvider.php
@@ -126,7 +126,8 @@ public function process(?string $userId, array $input, callable $reportProgress)
 			try {
 				$completions = [];
 				if ($this->openAiAPIService->isUsingOpenAi() || $this->openAiSettingsService->getChatEndpointEnabled()) {
-					$summarySystemPrompt = 'Summarize the following text in the same language as the text.';
+					$summarySystemPrompt = 'You are a helpful assistant that summarizes text in the same language as the text. ' .
+						'You should only return the summary without any additional information.';
 
 					foreach ($prompts as $p) {
 						$completion = $this->openAiAPIService->createChatCompletion($userId, $model, $p, $summarySystemPrompt, null, 1, $maxTokens);
@@ -134,7 +135,9 @@ public function process(?string $userId, array $input, callable $reportProgress)
 					}
 				} else {
 					$wrapSummaryPrompt = function (string $p): string {
-						return 'Summarize the following text delimited by XML tags in the same language as the text.\n\n<text>\n' . $p . '\n</text>';
+						return 'You are a helpful assistant that summarizes text in the same language as the text. ' .
+							'You should only return the summary without any additional information. ' .
+							'Here is the text to summarize:\n\n' . $p . '\n';
 					};
 
 					foreach (array_map($wrapSummaryPrompt, $prompts) as $p) {
diff --git a/tests/unit/Providers/OpenAiProviderTest.php b/tests/unit/Providers/OpenAiProviderTest.php
index 74833fe0..d3c1435f 100644
--- a/tests/unit/Providers/OpenAiProviderTest.php
+++ b/tests/unit/Providers/OpenAiProviderTest.php
@@ -391,7 +391,8 @@ public function testSummaryProvider(): void {
 		$url = self::OPENAI_API_BASE . 'chat/completions';
 
 		$options = ['timeout' => Application::OPENAI_DEFAULT_REQUEST_TIMEOUT, 'headers' => ['User-Agent' => Application::USER_AGENT, 'Authorization' => self::AUTHORIZATION_HEADER, 'Content-Type' => 'application/json']];
-		$systemPrompt = 'Summarize the following text in the same language as the text.';
+		$systemPrompt = 'You are a helpful assistant that summarizes text in the same language as the text. ' .
+			'You should only return the summary without any additional information.';
 		$options['body'] = json_encode([
 			'model' => Application::DEFAULT_COMPLETION_MODEL_ID,
 			'messages' => [['role' => 'system', 'content' => $systemPrompt],