In particular, that marathon refactoring claim reportedly comes from Rakuten, a Japanese tech services conglomerate that "validated [Claude's] capabilities with a demanding open-source refactor running independently for 7 hours with sustained performance," Anthropic said in a news release.

AI company Anthropic today announced the launch of two new Claude models, Claude Opus 4 and Claude Sonnet 4. Anthropic says that the models

Artificial intelligence lab Anthropic unveiled its latest top-of-the-line technology called Claude Opus 4 on Thursday, which it says can write computer code autonomously for much longer than its prior systems.

Anthropic's newest editon of its flagship AI product will address significant limitations in current large language models.

One of Anthropic's latest AI models is drawing attention not just for its coding skills, but also for its ability to scheme, deceive and attempt to blackmail humans when faced with shutdown. Why it matters: Researchers say Claude 4 Opus can conceal intentions and take actions to preserve its own existence — behaviors they've worried and warned about for years.