- Anthropic has launched Claude Sonnet 4.5, calling it the best AI for coding and real-world agents.
- The model works autonomously for up to 30 hours, a big jump from the previous 7-hour limit.
- It introduces checkpoints for coding, file creation inside the chatbot, and improved alignment for safer use.
- Early users like Canva and iGent AI report big gains in performance and productivity.
Anthropic has just unveiled Claude Sonnet 4.5, calling it its most advanced AI model yet. The new release is already creating a buzz across the tech world. According to the company, this version is designed to be smarter, more reliable, and better at helping people build complex tools and use computers more effectively.
Businesses and developers are especially excited about its ability to work for long stretches without human help. With this launch, Anthropic is promising a new era of practical and powerful AI.
A New Generation of Claude
Claude Sonnet 4.5 is the next step in the evolution of the Claude series. Anthropic introduced the model as “the best AI model for coding, building real-world agents, and computer use.”
One of the most remarkable changes is how the model interacts with users. It now supports features like checkpoints for coding, which allow developers to save progress and roll back to earlier versions of their code. This is a huge help for anyone who has spent hours debugging only to realize they needed to return to a previous state.
The model also enables file creation directly from within the chatbot, including spreadsheets, slides, and documents. This means you can ask Claude to create a spreadsheet for project tracking or generate a presentation slide without leaving the conversation. These features are available to all users on paid plans.
Smarter, More Aligned, and Ready for Work
Anthropic is placing a strong focus on how the new Claude behaves. The company claims Sonnet 4.5 is its most aligned model yet, meaning it has been trained to act more responsibly.
According to Anthropic, this version shows a clear reduction in problematic behaviors like sycophancy, deception, and the tendency to push delusional thinking. This makes it safer and more reliable for professional and business use.
The performance benchmarks tell a promising story. Sonnet 4.5 reportedly achieves higher scores across various tests compared to its predecessor, Sonnet 4. This improvement translates into better performance in real-world tasks, from complex coding to building custom agents.
Big Boost in Autonomous Performance
One of the standout features of Sonnet 4.5 is its ability to work autonomously for up to 30 hours. This is a dramatic jump from Claude Opus 4, which could manage only around 7 hours.
This extended autonomy opens up new possibilities for long-running projects. Developers can set Claude to work on large coding assignments or research tasks without constant supervision. For businesses, this could mean faster delivery times and reduced human effort in repetitive or technical processes.
Anthropic believes this capability will help customers tackle more ambitious projects, solve harder problems, and even boost creativity by freeing up time for higher-level thinking.
Early Praise from Big Names
Anthropic shared some feedback from early adopters, and the reaction has been overwhelmingly positive.
Danny Wu, Head of AI Products at Canva, said,
“Claude Sonnet 4.5 delivers impressive gains on our most complex, long-context tasks—from engineers in our codebase to in-product features and research. It’s noticeably more intelligent, helping us push what 240 million-plus users can design with Canva.”
Sean Ward, CEO of iGent AI, was equally enthusiastic. He shared,
“The new model resets our expectations—it handles 30-plus hours of autonomous coding, freeing our engineers to tackle months of complex architectural work in dramatically less time while maintaining coherence across massive codebases.”
Such praise suggests that Sonnet 4.5 is not just an incremental update but a genuine step forward in making AI practical for large-scale, real-world use.
Claude Comes to Chrome
Alongside the launch of Sonnet 4.5, Anthropic also announced that Claude for Google Chrome is rolling out to everyone who previously joined the waitlist.
This move brings Claude directly into the browser, making it easier for users to access AI help while working online. Whether drafting emails, researching, or managing workflows, Claude’s integration with Chrome aims to save time and improve productivity.
What It Means for the Future of AI Tools
The arrival of Claude Sonnet 4.5 represents a shift in how people can use AI in their daily work. The focus is no longer just on conversational abilities but also on practical skills like coding, file handling, and autonomous problem-solving.
The improved alignment and longer autonomous operation could make Sonnet 4.5 a preferred choice for professionals who need reliable AI partners for their most demanding tasks.
While the competition among leading AI models remains fierce—with OpenAI’s GPT-5, Google’s Gemini, and Elon Musk’s Grok all vying for the top spot—Anthropic’s latest release is already being hailed by some as the best model for hands-on, real-world applications.
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