feat: add support for gpt-5 models in _inferModelProvider (#9294)

Author: mdrxy

libs/langchain-classic/src/chat_models/universal.ts

@@ -212,6 +212,7 @@ export function _inferModelProvider(modelName: string): string | undefined {
   if (
     modelName.startsWith("gpt-3") ||
     modelName.startsWith("gpt-4") ||
+    modelName.startsWith("gpt-5") ||
     modelName.startsWith("o1") ||
     modelName.startsWith("o3") ||
     modelName.startsWith("o4")

libs/langchain/src/chat_models/universal.ts

@@ -217,6 +217,7 @@ export function _inferModelProvider(modelName: string): string | undefined {
   if (
     modelName.startsWith("gpt-3") ||
     modelName.startsWith("gpt-4") ||
+    modelName.startsWith("gpt-5") ||
     modelName.startsWith("o1") ||
     modelName.startsWith("o3") ||
     modelName.startsWith("o4")