def generate_model(name):
    """
    Generate a model based on the given name.

    Args:
        name (str): The name of the model to generate.

    Returns:
        tuple: A tuple containing the model's performance metrics.
    """
    models = {
        '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 models.get(name, None)

# Example usage:
print(generate_model('verified_default'))