Anthropic just launched Claude Opus 5, its latest model, which it says boasts near Fable 5 capabilities at a fraction of the cost. “Claude Opus 5 is available today. It’s a thoughtful and proactive model that comes close to the frontier intelligence of Claude Fable 5 at half the price,” the AI giant shared in a press release. “Opus 5 is designed to be used every day: it works more efficiently than other models.” Anthropic says the model performed great on coding and knowledge work evaluations, though Anthropic’s secretive top dog model Mythos 5 still leads on cybersecurity tasks. That’s on purpose, according to Anthropic itself. “As with its predecessor, Opus 4.8, we’ve intentionally avoided training Opus 5 on cyber tasks,” the company said. “The model has nevertheless improved substantially on these tasks as a result of becoming more generally capable, and it comes close to Mythos 5 at finding cybersecurity vulnerabilities.”
But the model won’t exploit those vulnerabilities as much as Mythos 5 might. In the release, Anthropic also claimed that Opus 5 was its “safest model yet,” and that it exhibits “the lowest rates of deceptive behavior; and is the least susceptible to being tricked into misuse.”
