diff --git a/src/renderer/src/providers/OpenAIProvider.ts b/src/renderer/src/providers/OpenAIProvider.ts
index b16215d5ef..03d878fd16 100644
--- a/src/renderer/src/providers/OpenAIProvider.ts
+++ b/src/renderer/src/providers/OpenAIProvider.ts
@@ -129,6 +129,18 @@ export default class OpenAIProvider extends BaseProvider {
     return assistant?.settings?.temperature
   }
 
+  private getProviderSpecificParameters(model: Model) {
+    if (this.provider.id === 'openrouter') {
+      if (model.id.includes('deepseek-r1')) {
+        return {
+          include_reasoning: true
+        }
+      }
+    }
+
+    return {}
+  }
+
   async completions({ messages, assistant, onChunk, onFilterMessages }: CompletionsParams): Promise<void> {
     const defaultModel = getDefaultModel()
     const model = assistant.model || defaultModel
@@ -175,6 +187,7 @@ export default class OpenAIProvider extends BaseProvider {
       keep_alive: this.keepAliveTime,
       stream: isSupportStreamOutput(),
       ...(assistant.enableWebSearch ? getOpenAIWebSearchParams(model) : {}),
+      ...this.getProviderSpecificParameters(model),
       ...this.getCustomParameters(assistant)
     })
 
@@ -207,10 +220,12 @@ export default class OpenAIProvider extends BaseProvider {
       const time_completion_millsec = new Date().getTime() - start_time_millsec
       const time_thinking_millsec = time_first_content_millsec ? time_first_content_millsec - start_time_millsec : 0
 
+      const delta = chunk.choices[0]?.delta
+
       onChunk({
-        text: chunk.choices[0]?.delta?.content || '',
+        text: delta?.content || '',
         // @ts-ignore key is not typed
-        reasoning_content: chunk.choices[0]?.delta?.reasoning_content || '',
+        reasoning_content: delta?.reasoning_content || delta.reasoning || '',
         usage: chunk.usage,
         metrics: {
           completion_tokens: chunk.usage?.completion_tokens,