I am thrilled to introduce Claude Opus 4.8, our most terrifying and dangerous model yet. There’s a small chance it won’t kill you, but it will almost certainly take your job. I feel terrible about this, and terribly excited. I think there’s a very good chance Opus 4.8 will be able to build a model that reverses the damage Opus 4.8 does. We can’t know for sure, but a decade from now might be really great. Hold on to your butts.