Anthropic just dropped Claude Sonnet 4.5, and it's rewriting the rules for autonomous AI. The model coded for 30 hours straight without human intervention, building a complete chat application with 11,000 lines of code. This isn't incremental progress - it's a 4x leap from their previous 7-hour benchmark that signals AI agents are ready for real enterprise workloads.
Anthropic just made every enterprise CTO sit up and take notice. The company's new Claude Sonnet 4.5 model didn't just write code - it built an entire chat application resembling Slack or Microsoft Teams during a 30-hour autonomous coding marathon. The AI generated 11,000 lines of production-ready code and only stopped when the job was complete.
This represents a massive leap forward in AI agent capabilities. Anthropic's previous Opus 4 model made headlines in May for running autonomously for seven hours. Now they've quadrupled that endurance while maintaining code quality throughout the extended session.
"We're calling Claude Sonnet 4.5 the best model in the world for real-world agents, coding, and computer use," Anthropic declared in today's announcement. The company positioned this as their strongest play yet in the rapidly intensifying battle with OpenAI and Google for AI agent supremacy.
The timing couldn't be more strategic. Just days ago, OpenAI launched Pulse, their morning routine ChatGPT feature, while Google continues pushing Bard capabilities. But Anthropic's approach focuses on sustained, complex tasks that mirror real enterprise workflows.
Early enterprise results are validating this strategy. Canva, one of the beta testers, reported Claude Sonnet 4.5 excelled at "complex, long-context tasks - from engineering in our codebase to in-product features and research." The model shows particular strength in cybersecurity, financial services, and research applications where sustained focus matters more than quick responses.
The computer navigation improvements are equally impressive. Dianne Penn, head of product management at Anthropic, told The Verge that Claude Sonnet 4.5 is "more than three times as skilled at navigating a browser and using a computer" compared to their October 2024 technology. This builds on 's Computer Use feature that debuted .
