Anthropic says Opus 5.5 satisfied its architecture, online-safeguard, and offline-safeguard criteria, supporting the decision to release it.

“So across all those three dimensions, we're putting all the right work in place to make sure that we feel really good that we can put a model out there and it's going to be safe, and really, that's fundamentally what we mean.”

“And so for Opus 5.5, it's an excellent model. It's also really, really great on all the dimensions that we care about across those three things, and therefore we feel good about releasing that model.”