chore: Remove deprecated withStructuredOutput-handling in langchain/openai

Author: davidkna-sap

.changeset/bold-towns-start.md

@@ -0,0 +1,5 @@
+---
+'@sap-ai-sdk/langchain': minor
+---
+
+[Compatibility Note] Remove structured ouput handing for deprecated gpt-4 & gpt-3 models

packages/langchain/src/openai/chat.test.ts

@@ -259,20 +259,6 @@ describe('Chat client', () => {
       );
     });
 
-    it('should use `functionCalling` for older deprecated models', async () => {
-      const oldClient = new AzureOpenAiChatClient({
-        modelName: 'gpt-35-turbo'
-      });
-      const spy = jest.spyOn(oldClient, 'withConfig');
-
-      oldClient.withStructuredOutput(joke);
-      expect(spy).toHaveBeenCalledWith(
-        expect.objectContaining({
-          tools: expect.any(Array)
-        })
-      );
-    });
-
     it('should use `functionCalling` with openai function json schema', async () => {
       const openAiFunctionJsonSchema: AzureOpenAiFunctionObject = {
         name: 'joke',

packages/langchain/src/openai/chat.ts

@@ -175,18 +175,8 @@ export class AzureOpenAiChatClient extends BaseChatModel<AzureOpenAiChatCallOpti
       );
     }
 
-    // TODO: Remove this once the deprecated models are removed
-    if (
-      !this.modelName.startsWith('gpt-3') &&
-      !this.modelName.startsWith('gpt-4-') &&
-      this.modelName !== 'gpt-4'
-    ) {
-      if (method === undefined) {
-        method = 'jsonSchema';
-      }
-    } else if (method === 'jsonSchema') {
-      // Falling back to tool calling.`
-      method = '';
+    if (method === undefined) {
+      method = 'jsonSchema';
     }
 
     if (method === 'jsonMode') {