Anthropic rolls out Opus 5 AI model in efficiency upgrade

The San Francisco-based lab said the new ‌Claude ⁠AI model was well suited for daily ⁠office and computer programming tasks [File] | Photo Credit: REUTERS Anthropic on Friday launched Opus 5, its latest AI model that the startup ‌says nears the capabilities of its more powerful cousin Fable 5 at half ‌the price.The San Francisco-based lab said the new ‌Claude ⁠AI model was well suited for daily ⁠office and computer programming tasks.In an interview with Reuters, Anthropic product leader Dianne Penn said the release, more ​efficient than May’s Opus 4.8, ‌reflected a rapid pace of development.“We’re building and continue to consistently deliver frontier intelligence and bring that as accessibly as possible with every ‌model generation,” said Penn.In testing, Opus ​5 was less capable of exploiting cyber vulnerabilities than Anthropic’s top-shelf AI, so ⁠its related safeguards are less restrictive than Fable 5’s. Opus 5 was also less susceptible to being ‌tricked into misuse than Anthropic’s other current models, the startup said.Released in June, Anthropic’s Fable 5 was temporarily unavailable following U.S. concerns that its capabilities could be diverted to foreign military intelligence.Users should pick Opus 5 for value ‌and Fable 5 for “days-long, very autonomous projects,” Penn ​said. Asked about the Kimi K3 “open” model from China-based Moonshot, which the U.S. accused of ⁠freeloading off Anthropic, Penn said it “remains to be seen” ⁠how open-weight models generally perform on complicated real-world projects that users ask Claude ‌to tackle.Open-weight models allow users to download, run and customise the virtual brains of an AI, ​unlike proprietary models. Published - July 27, 2026 09:53 am IST