Henry Tu upgraded the Cerebras integration in the ag2ai/ag2 repository to support the Llama 3.3 70b model, replacing the previous Llama 3.1 70b version. He approached this migration by updating configuration files and test suites to reflect the new model naming, ensuring seamless backend compatibility. Using Python and leveraging his skills in API integration and model management, Henry also adjusted the pricing logic to accommodate the updated model, supporting accurate cost forecasting. The work maintained deployment pipeline stability and prepared assets for downstream validation, demonstrating a focused, well-scoped engineering effort that addressed both technical and business requirements.