For me Opus 5 was the nail in the coffin. Fable without the restrictions was a great model, but became unusable with the security guardrails. Opus 5 became so bad and slow it's unbearable. And since Fable falls back to Opus all the time it was time to switch. Me and my friends are calling it Slowpus by now... Up until some weeks ago Anthropic was the king, but we all switched to Grok 4.6. It became slow as well but is not down all the time, is a solid model and paired with another reviewer model it's a great daily driver.