Anthropic's Claude Sonnet 4.5: AI That Codes Nonstop for 30 Hours!

October 1, 2025

Anthropic has just dropped an exciting new AI model called Claude Sonnet 4.5. This superstar can work alone for up to 30 hours straight to build apps from zero! Just imagine a machine that keeps coding non-stop, without a single coffee break. This is a big jump from its older sibling, Opus 4.1, which lasted only seven hours on its own.

Autonomous App Development

How cool is this? Claude Sonnet 4.5 showcased its brainpower by creating a chat app like Slack and Microsoft Teams. It wrote over 11,000 lines of code in one go, without stopping until the app was ready to roll. Anthropic proudly calls Sonnet 4.5 "the best model at using computers," highlighting its super skills in making complex software agents.

Advanced Computer Interaction

Claude Sonnet 4.5 is not just about coding; it’s like a human on your screen. It can see what’s on the monitor and move around all by itself to finish tasks. This upgrade builds on last year’s Computer Use function, making the AI smarter and more like a digital assistant that really gets the job done.

Upgraded Claude Code & API

Anthropic also gave Claude Code a shiny new "checkpoint" feature. What’s that? It lets users roll back their code to earlier versions whenever needed, like having a magic undo button during your projects. Plus, the Claude API is stronger now, letting AI agents run longer and tackle bigger challenges. Imagine creating documents, slides, and spreadsheets just by chatting with Claude!

Imagine With Claude: Creative AI for Software

Here’s the cherry on top! The new "Imagine with Claude" feature lets users turn wild ideas into real software in real time. No coding skills? No problem! Unlike old-school tools that need commands and scripts, this one writes software directly from your spoken or typed prompts.

Availability and Access

Good news for everyone! Free users get access to Claude Sonnet 4.5 but might hit a daily token limit. Premium users don’t have to worry about any price hike and will enjoy full access to this AI wonder.

Anthropic’s Claude Sonnet 4.5 is setting a blazing trail in AI, turning app development into a thrilling, nonstop ride. Are you ready to let AI do the coding magic for you?