Personally how I see it, benchmarks aside, Fable really is a tier above both Opus and Codex. Still makes mistakes, still needs supervision, but much less, and with a good feedback loop is able to achieve a lot independently. If OpenAI had something tucked away, they'd have probably already released it, right? I'm worried as this big of a difference means that we're probably going to speed towards a big price increase, at least until some competitors catch up. But if Anthropic really just built a moat and they don't slow down, the market is going to be much different, and the price of frontier model(s) will follow. Even if you want to go for open source, having enough power to run 1T param models means a non trivial investment for many companies out there.