Anthropic’s latest AI model spent 30 hours running by itself to code a chat app akin to Slack or Teams. It spat out about 11,000 lines of code, according to Anthropic, and it only stopped running when it had completed the task.
The model, Claude Sonnet 4.5, was announced today, and its ability to operate autonomously for 30 hours straight is a huge jump forward. Before, the company’s Opus 4 model made headlines in May for its ability to operate for seven hours.
It’s all a significant step in Anthropic’s battle to corner the market on both AI agents and AI coding. The company called Claude Sonnet 4.5 “the best model in the world for real- …