Claude Sonnet 4.5 expands developer options with rollbacks and longer-running agents
New Claude Sonnet 4.5 adds developer checkpoints, longer-running agents, and instant creative software generation through Imagine with Claude.
Anthropic has released Claude Sonnet 4.5, featuring a suite of new upgrades designed to enhance coding, automation, and creativity. The update enhances Claude Code, extends Computer Use, and introduces experimental tools to boost productivity and facilitate real-world applications.
Claude Code now features checkpoints, allowing developers to roll back projects to earlier versions. The Claude API has also been expanded, supporting longer-running agents to generate files such as slides, spreadsheets, and documents directly within chats.
The model’s Computer Use function has been strengthened, enabling agents to operate applications for up to 30 hours autonomously. Anthropic says Claude Sonnet 4.5 built a Slack-style app with 11,000 lines of code in one session.
A new feature, Imagine with Claude, focuses on generating creative software. The system produced a Shakespeare-themed desktop with customised scripts and performance schedules from a single prompt, highlighting its versatility.
Anthropic has maintained steady pricing for free and premium users, positioning Sonnet 4.5 as its most practical and feature-rich release yet, combining reliability with expanded creative and developer-friendly tools.
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