feat: added perplexity model

app/lib/.server/llm/model.ts

@@ -128,6 +128,15 @@ export function getXAIModel(apiKey: OptionalApiKey, model: string) {
   return openai(model);
 }
 
+export function getPerplexityModel(apiKey: OptionalApiKey, model: string) {
+  const perplexity = createOpenAI({
+    baseURL: 'https://api.perplexity.ai/',
+    apiKey,
+  });
+
+  return perplexity(model);
+}
+
 export function getModel(
   provider: string,
   model: string,
@@ -170,6 +179,8 @@ export function getModel(
       return getXAIModel(apiKey, model);
     case 'Cohere':
       return getCohereAIModel(apiKey, model);
+    case 'Perplexity':
+      return getPerplexityModel(apiKey, model);
     default:
       return getOllamaModel(baseURL, model);
   }