Add ChatClient getChatModel() method

[timothyBrake]

Expected Behavior

When injecting the ChatClient in any service I want to log the actual underlying model being used. Because we have multiple ChatClients of different underlying models, we want to log the actual model being used in the service that uses the ChatClient. E.g.

public class QcrIntentAgent {

    @Autowired
    private ChatClient chatClient;


    public void doSomething(){
        log.debug("LLM being used: {}", chatClient.getChatModel().getModel());
       // E.g.: 
       // LLM being used: gpt-4.1-nano 
       // LLM being used: gpt-4o-mini 
       // LLM being used: mistral  
       //. LLM being used: llama3  
       chatClient.prompt(...);
    }

Current Behavior

There is no clean way of getting this info besides injecting the ChatModel itself. Resulting in either injecting both ChatModel and ChatClient OR injecting just the model and creating a new ChatClient here.

    @Autowired
    private ChatClient chatClient;

    @Autowired
    private ChatModel chatModel;

     public void doSomething(){
        log.debug("LLM being used: {}", chatModel.getDefaultOptions().getModel());
         chatClient.prompt(...);
     }

// OR


   @Autowired
    private ChatModel chatModel;

    public void doSomething(){
        log.debug("LLM being used: {}", chatModel.getDefaultOptions().getModel());
        ChatClient.builder(chatModel).build().prompt(...);
     }

Context

Alternatives are see Current Behavior.
Creating a utility class

@UtilityClass
public class ChatClientUtils {

   /**
    * Returns the model configured for the ChatClient.
    * This workaround is needed because Spring AI 1.0.0 does not expose the model via public API.
    * WARNING: This depends on the internal structure of DefaultChatClient.
    */
   public static String getModel(ChatClient chatClient) {
       if (chatClient instanceof DefaultChatClient defaultClient) {
           DefaultChatClient.DefaultChatClientRequestSpec requestSpec = (DefaultChatClient.DefaultChatClientRequestSpec) defaultClient.prompt("Hello");
           return requestSpec.getChatOptions().getModel();
       } else {
           throw new IllegalArgumentException("Unsupported ChatClient implementation: " + chatClient.getClass().getName());
       }
   }
}