def select_top_capabilities(capabilities):
    """
    Select top capabilities based on their performance and complexity.

    Args:
        capabilities (list): List of tuples containing capability name, score, size, and time.

    Returns:
        tuple: Top capability with the highest score.
    """
    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)]
top_capability = select_top_capabilities(capabilities)
print(top_capability)