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      Choosing the Right AI Model for Your AI Agent

      In this article, you’ll learn how to choose the best AI model for your AI Agent based on your specific use case, performance needs, and conversation complexity.

      What are AI Models?

      AI models are the engine behind your AI Agent. They process input (like customer questions) and generate output (like answers). Each model has unique strengths in reasoning, speed, memory, and language capabilities. Understanding these differences helps you build a more effective AI Agent.

      How to Change the AI Model

      You can easily change your AI Agent's model:

      1. Navigate to 'Agents'

      2. Click the three dots (⋯) in the top right corner.

      3. Choose ‘AI Model’ from the dropdown menu.

      4. Select the model that best fits the type of questions your AI Agent needs to handle.

      Note: You can change the model at any time if you find that another one suits your use case better.

      Available Models in Watermelon

      You can choose from several models depending on your needs:

      • GPT-5, GPT-5-mini, GPT-5-nano, GPT-5-chat

      • GPT-4.1, GPT-4.1-mini, GPT-4.1-nano

      • GPT-4o

      • GPT-o3, GPT-o3-mini

      Each model has different strengths, performance levels, and ideal use cases.

      For a complete comparison, visit our blog: Choosing the right model for your AI Agent

      Use Case Recommendations

      Use Case Recommended Models Why
      Complex customer service flows GPT-5, GPT-o3 Excellent at handling logic-heavy conversations
      Fast replies & fallback answers GPT-5-nano, GPT-4.1-nano Lightweight and fast, ideal for performance
      Long conversation memory GPT-4.1, GPT-4.1-mini Remembers long conversations better
      Real-time answers about recent updates GPT-5, GPT-5-chat Most up-to-date knowledge base
      Multilingual agents GPT-5, GPT-4.1, GPT-4o Very strong language capabilities across multiple languages
      Internal agents (HR, IT, Finance) GPT-5-mini, GPT-4.1-mini Smart and with good memory, ideal for internal use
      Workflow automation (AI Actions) GPT-5, GPT-5-chat Strong reasoning and structured output, perfect for workflows
       

      How to Choose the Right Model

      1. Define your AI Agent’s primary function.

        • Is it answering FAQs, guiding users through tasks, or automating actions?

      2. Set your priorities.

        • Do you need faster responses, more detailed answers, or better multilingual support?

      3. Use the table above.

        • Pick the model that aligns best with your goals.

      You can always test different models and compare them using the Interactive Tester in Watermelon. Try to test as many use cases as possible that match the incoming conversations.