def calculate_best_capability(capabilities):
    """
    Calculate the best capability from a list.

    Args:
        capabilities (list): List of tuples containing capability name and metrics.

    Returns:
        tuple: The best capability with its metrics.
    """
    return max(capabilities, key=lambda x: x[1])

# Example usage
capabilities = [
    ('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)
]
best_capability = calculate_best_capability(capabilities)
print(best_capability)