My opinion of Opus is that it takes the correct action 19/20 times, where Sonnet takes the correct action 18/20 times. It’s not strictly necessary to use Opus,

My opinion of Opus is that it takes the correct action 19/20 times, where Sonnet takes the correct action 18/20 times. It’s not strictly necessary to use Opus, but if you have the subscription already it’s just a pure win.