added perplexity models

Perplexity Integration

.env.example

@@ -40,5 +40,10 @@ OPENAI_LIKE_API_KEY=
 # You only need this environment variable set if you want to use Mistral models
 MISTRAL_API_KEY=
 
+# Get your Perplexity API Key here - 
+# https://www.perplexity.ai/settings/api
+# You only need this environment variable set if you want to use Perplexity models
+PERPLEXITY_API_KEY=
+
 # Include this environment variable if you want more logging for debugging locally
 VITE_LOG_LEVEL=debug

app/lib/.server/llm/api-key.ts

@@ -25,6 +25,8 @@ export function getAPIKey(cloudflareEnv: Env, provider: string) {
       return env.MISTRAL_API_KEY || cloudflareEnv.MISTRAL_API_KEY;        
     case "OpenAILike":
       return env.OPENAI_LIKE_API_KEY || cloudflareEnv.OPENAI_LIKE_API_KEY;
+    case 'Perplexity':
+      return env.PERPLEXITY_API_KEY || cloudflareEnv.PERPLEXITY_API_KEY;
     default:
       return "";
   }

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

@@ -57,6 +57,15 @@ export function getGroqModel(apiKey: string, model: string) {
   return openai(model);
 }
 
+export function getPerplexityModel(apiKey: string, model: string) {
+  const perplexity = createOpenAI({
+    baseURL: 'https://api.perplexity.ai/',
+    apiKey,
+  });
+
+  return perplexity(model);
+}
+
 export function getOllamaModel(baseURL: string, model: string) {
   let Ollama = ollama(model);
   Ollama.config.baseURL = `${baseURL}/api`;
@@ -101,6 +110,8 @@ export function getModel(provider: string, model: string, env: Env) {
       return getDeepseekModel(apiKey, model)
     case 'Mistral':
       return  getMistralModel(apiKey, model);
+    case 'Perplexity':
+      return getPerplexityModel(apiKey, model);
     default:
       return getOllamaModel(baseURL, model);
   }

app/utils/constants.ts

@@ -43,6 +43,11 @@ const staticModels: ModelInfo[] = [
   { name: 'mistral-small-latest', label: 'Mistral Small', provider: 'Mistral' },
   { name: 'codestral-latest', label: 'Codestral', provider: 'Mistral' },
   { name: 'mistral-large-latest', label: 'Mistral Large Latest', provider: 'Mistral' },
+  { name: 'llama-3.1-sonar-small-128k-online', label: 'Sonar Small Online', provider: 'Perplexity' },
+  { name: 'llama-3.1-sonar-large-128k-online', label: 'Sonar Large Online', provider: 'Perplexity' },
+  { name: 'llama-3.1-sonar-huge-128k-online', label: 'Sonar Huge Online', provider: 'Perplexity' },
+  { name: 'llama-3.1-sonar-small-128k-chat', label: 'Sonar Small Chat', provider: 'Perplexity' },
+  { name: 'llama-3.1-sonar-large-128k-chat', label: 'Sonar Large Chat', provider: 'Perplexity'},
 ];
 
 export let MODEL_LIST: ModelInfo[] = [...staticModels];