Anthropic has unveiled its latest AI model, Claude Sonnet 4.5, which the company claims can work autonomously for up to 30 hours to create applications from scratch. This marks a significant improvement over its previous model, Opus 4.1, which could operate independently for just seven hours.

Autonomous App Development

According to Anthropic, Claude Sonnet 4.5 demonstrated its capabilities by creating a chat application similar to Slack and Microsoft Teams, generating over 11,000 lines of code without stopping until the task was complete. The company describes Sonnet 4.5 as the "best model at using computers," emphasizing its focus on building complex agents.

Advanced Computer Interaction

Claude Sonnet 4.5 expands on the Computer Use functionality introduced last year. The AI can now interpret what appears on the screen and navigate it autonomously, performing tasks in a manner akin to human users.

Upgraded Claude Code & API

Anthropic has added a checkpoint feature to Claude Code, allowing users to easily revert to previous versions of their code during any project. Additionally, the Claude API has been enhanced, enabling agents to operate for longer durations and tackle more complex challenges. Users can now generate documents, slides, and spreadsheets directly within a conversation with Claude.

Imagine With Claude: Creative AI for Software

The new Imagine with Claude feature allows users to transform their ideas into software in real-time. Unlike traditional coding tools, it requires no preset commands or code, letting users create software purely based on their prompts.

Availability and Access

Free users will have access to Claude Sonnet 4.5, though usage may be limited by a daily token allowance. Anthropic has confirmed that premium members will not face any price increase while gaining access to the new AI model.