Add gpt-4o models

PR-URL: #6

Author: timursevimli

lib/openai/data.js

@@ -2,6 +2,8 @@
 
 const models = {
   completion: {
+    'gpt-4o': { prices: { prompt: 5.0, completion: 15.0 } },
+    'gpt-4o-2024-05-13': { prices: { prompt: 5.0, completion: 15.0 } },
     'gpt-4-turbo-2024-04-09': { prices: { prompt: 10.0, completion: 30.0 } },
     'gpt-4-1106-preview': { prices: { prompt: 10.0, completion: 30.0 } },
     'gpt-3.5-turbo-0125': { prices: { prompt: 0.5, completion: 1.5 } },