LLM Parameter Optimization: Stop Leaving Agent Performance on the Table

Parameter optimization for large language models (LLMs) focuses on adjusting inference parameters like temperature, top_p, and frequency_penalty, which control the behavior of pre-trained models during response generation, rather than the hyperparameters involved in training the models from scratch. While training hyperparameters require significant computational resources and expertise, inference parameters can be tested and optimized quickly to refine model output, such as ensuring coherence and preventing repetition. Effective optimization relies on having clear evaluation metrics aligned with production goals, representative datasets, and a solid foundational setup for the agent. Tools like the Opik Parameter Optimizer leverage Bayesian optimization to efficiently explore parameter spaces, helping developers fine-tune model performance. This process works best when combined with eval-driven development, ensuring that AI applications meet user expectations through continuous testing and iteration.