def generate_candidate(model_name):
    """
    Generate a candidate based on the given model name.

    Args:
        model_name (str): The name of the model to use for generation.

    Returns:
        tuple: A tuple containing the generated candidate's parameters.
    """
    candidates = {
        'evolved_verified_generate_test_1768680667': (4235.89001196408, 51, 8305.7),
        'verified_default': (4235.0, 51, 8303.9),
        'evolved_verified_fib_fast_1769055768': (4235.0, 51, 8303.9)
    }
    
    return candidates.get(model_name, ('default', 0, 0))