Anthropic’s New AI Powers Through Code: “World’s Best” Claude Sonnet 4.5 Debuts
What Is Claude Sonnet 4.5? Claude is Anthropic’s family of AI assistants (named after Claude Shannon). Sonnet 4.5 is the latest “frontier model” optimized for coding and long-horizon tasks. Anthropic calls it a “new generation of coding models” techcrunch.com. Unlike a short-response chatbot, Sonnet 4.5 is built to use tools and software environments autonomously: it can open windows, edit code, run programs, and iterate for hours. According to Anthropic’s engineers, they observed it “maintaining focus for more than 30 hours on complex, multi-step tasks” anthropic.com. In effect, Claude Sonnet 4.5 acts less like a fleeting assistant and more like a