Anthropic Launches Claude Sonnet 4.5, an AI Model Demonstrating Extended Autonomous Coding Capability

Anthropic has unveiled its new AI model, Claude Sonnet 4.5, which independently ran for 30 hours to develop a chat application similar to Slack or Teams. During this time, it generated approximately 11,000 lines of code. This marks a significant improvement over the company's previous Opus 4 model, which could operate autonomously for seven hours. Anthropic views Claude Sonnet 4.5 as a major advancement in the competitive landscape of AI agents and coding technology.