diff --git a/lib/AppInfo/Application.php b/lib/AppInfo/Application.php
index fdb50ed8..cd47201c 100644
--- a/lib/AppInfo/Application.php
+++ b/lib/AppInfo/Application.php
@@ -62,6 +62,8 @@ class Application extends App implements IBootstrap {
 	public const MIN_CHUNK_SIZE = 500;
 	public const DEFAULT_MAX_NUM_OF_TOKENS = 1000;
 	public const DEFAULT_QUOTA_PERIOD = 30;
+	public const DEFAULT_SUMMARY_SYSTEM_PROMPT = '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.';
 	public const DEFAULT_QUOTA_CONFIG = ['length' => self::DEFAULT_QUOTA_PERIOD, 'unit' => 'day', 'day' => 1];
 
 	public const DEFAULT_OPENAI_TEXT_GENERATION_TIME = 10; // seconds
diff --git a/lib/Service/OpenAiSettingsService.php b/lib/Service/OpenAiSettingsService.php
index f63705c1..5c493ba6 100644
--- a/lib/Service/OpenAiSettingsService.php
+++ b/lib/Service/OpenAiSettingsService.php
@@ -35,6 +35,7 @@ class OpenAiSettingsService {
 		'max_tokens' => 'integer',
 		'use_max_completion_tokens_param' => 'boolean',
 		'llm_extra_params' => 'string',
+		'summary_system_prompt' => 'string',
 		'quota_period' => 'array',
 		'quotas' => 'array',
 		'usage_storage_time' => 'integer',
@@ -297,6 +298,17 @@ public function getMaxTokens(): int {
 	public function getLlmExtraParams(): string {
 		return $this->appConfig->getValueString(Application::APP_ID, 'llm_extra_params', lazy: true);
 	}
+	/**
+	 * @return string
+	 */
+	public function getSummarySystemPrompt(): string {
+		return $this->appConfig->getValueString(
+			Application::APP_ID,
+			'summary_system_prompt',
+			Application::DEFAULT_SUMMARY_SYSTEM_PROMPT,
+			lazy: true
+		) ?: Application::DEFAULT_SUMMARY_SYSTEM_PROMPT;
+	}
 
 	/**
 	 * @return array
@@ -579,6 +591,7 @@ public function getAdminConfig(): array {
 			'max_tokens' => $this->getMaxTokens(),
 			'use_max_completion_tokens_param' => $this->getUseMaxCompletionTokensParam(),
 			'llm_extra_params' => $this->getLlmExtraParams(),
+			'summary_system_prompt' => $this->getSummarySystemPrompt(),
 			// Updated to get max tokens
 			'quota_period' => $this->getQuotaPeriod(),
 			// Updated to get quota period
@@ -926,6 +939,14 @@ public function setLlmExtraParams(string $llmExtraParams): void {
 		}
 		$this->appConfig->setValueString(Application::APP_ID, 'llm_extra_params', $llmExtraParams, lazy: true);
 	}
+	public function setSummarySystemPrompt(string $summarySystemPrompt): void {
+		$this->appConfig->setValueString(
+			Application::APP_ID,
+			'summary_system_prompt',
+			$summarySystemPrompt,
+			lazy: true
+		);
+	}
 
 	/**
 	 * Setter for quotaPeriod; minimum is 1 day.
@@ -1262,6 +1283,9 @@ public function setAdminConfig(array $adminConfig): void {
 		if (isset($adminConfig['llm_extra_params'])) {
 			$this->setLlmExtraParams($adminConfig['llm_extra_params']);
 		}
+		if (isset($adminConfig['summary_system_prompt'])) {
+			$this->setSummarySystemPrompt($adminConfig['summary_system_prompt']);
+		}
 		if (isset($adminConfig['quota_period'])) {
 			$this->setQuotaPeriod($adminConfig['quota_period']);
 		}
diff --git a/lib/TaskProcessing/SummaryProvider.php b/lib/TaskProcessing/SummaryProvider.php
index ab9dce24..f6128802 100644
--- a/lib/TaskProcessing/SummaryProvider.php
+++ b/lib/TaskProcessing/SummaryProvider.php
@@ -153,8 +153,7 @@ public function process(?string $userId, array $input, callable $reportProgress)
 
 			try {
 				$completions = [];
-				$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. ';
+				$summarySystemPrompt = $this->openAiSettingsService->getSummarySystemPrompt() . ' ';
 				if (isset($input['format'])) {
 					if ($input['format'] === 'paragraph') {
 						$summarySystemPrompt .= 'Return the summary as a paragraph. ';
diff --git a/src/components/AdminSettings.vue b/src/components/AdminSettings.vue
index a018a391..6bb5a8b2 100644
--- a/src/components/AdminSettings.vue
+++ b/src/components/AdminSettings.vue
@@ -274,6 +274,17 @@
 						</template>
 					</NcButton>
 				</div>
+				<div class="line">
+					<NcTextArea
+						id="summary-system-prompt"
+						v-model="state.summary_system_prompt"
+						class="input"
+						:label="t('integration_openai', 'Summary system prompt')"
+						:helper-text="t('integration_openai', 'System prompt used when generating text summaries. Leave empty to use the default prompt.')"
+						:rows="5"
+						resize="vertical"
+						@update:model-value="onInput()" />
+				</div>
 				<div class="line">
 					<!--Input for max chunk size (prompt length) for a single request-->
 					<NcInputField
@@ -687,6 +698,7 @@ import NcInputField from '@nextcloud/vue/components/NcInputField'
 import NcNoteCard from '@nextcloud/vue/components/NcNoteCard'
 import NcSelect from '@nextcloud/vue/components/NcSelect'
 import NcTextField from '@nextcloud/vue/components/NcTextField'
+import NcTextArea from '@nextcloud/vue/components/NcTextArea'
 
 import axios from '@nextcloud/axios'
 import { showError, showSuccess } from '@nextcloud/dialogs'
@@ -718,6 +730,7 @@ export default {
 		NcFormBox,
 		NcFormBoxSwitch,
 		NcTextField,
+		NcTextArea,
 		NcInputField,
 		NcNoteCard,
 		NcDateTimePickerNative,
@@ -1022,6 +1035,7 @@ export default {
 				chunk_size: parseInt(this.state.chunk_size),
 				max_tokens: parseInt(this.state.max_tokens),
 				llm_extra_params: this.state.llm_extra_params,
+				summary_system_prompt: this.state.summary_system_prompt,
 				default_image_size: this.state.default_image_size,
 				quota_period: this.state.quota_period,
 				quotas: this.state.quotas,
diff --git a/tests/unit/Providers/OpenAiProviderTest.php b/tests/unit/Providers/OpenAiProviderTest.php
index 7177e52a..1bb94a29 100644
--- a/tests/unit/Providers/OpenAiProviderTest.php
+++ b/tests/unit/Providers/OpenAiProviderTest.php
@@ -517,6 +517,7 @@ public function testSummaryProvider(): void {
 
 		$prompt = 'This is a test prompt';
 		$n = 1;
+		$this->openAiSettingsService->setSummarySystemPrompt('This is a custom summary system prompt');
 
 		$response = '{
             "id": "chatcmpl-123",
@@ -544,8 +545,7 @@ 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 = '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. ';
+		$systemPrompt = 'This is a custom summary system prompt ';
 		$options['body'] = json_encode([
 			'model' => Application::DEFAULT_COMPLETION_MODEL_ID,
 			'messages' => [