SAN FRANCISCO, July 24 (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 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. Released in June, Anthropic's Fable 5 was temporarily unavailable following U.S. concerns that its capabilities could be diverted to foreign military intelligence. Open-weight models ​allow users to ‌download, run and customise the virtual brains of an ​AI, unlike proprietary models.