optimizer = dspy.GEPA(
    metric=metric_with_feedback,
    auto="medium",
    reflection_minibatch_size=3,
    candidate_selection_strategy="pareto",
    reflection_lm=dspy.LM("gpt-5", temperature=1.0, max_tokens=32000),
    use_merge=True,
    track_stats=True,
)

optimized = optimizer.compile(program, trainset=train, valset=val)