Anthropic has officially launched Claude Sonnet 4.5, its most advanced large language model to date, along with a range of updates across its AI ecosystem. The company claims this version is a significant leap forward in reasoning ability, coding performance, and handling extended tasks compared to its predecessor.
Smarter Reasoning and Advanced Coding
Claude Sonnet 4.5 has been fine-tuned to perform better in real world scenarios that demand accurate reasoning, from legal and financial research to medical and scientific problem solving. It also excels in coding tasks, offering more reliable results for developers. Benchmark tests show that Claude Sonnet 4.5 leads the OSWorld test at 61.4 percent, a sharp improvement from 42.2 percent achieved by Sonnet 4, highlighting its practical efficiency.
Claude Code Gets Major Enhancements
Alongside the new model, Anthropic has rolled out updates to Claude Code, its developer-focused interface. These include checkpoints to save and return to progress, a redesigned terminal experience, and a dedicated extension for Visual Studio Code. The Claude API now supports context editing and memory management, making it easier for agents to handle longer and more complex tasks. Within the Claude apps, users can now execute code, create spreadsheets, build presentations, and draft documents seamlessly.
Introducing the Claude Agent SDK
A big step forward for developers is the release of the Claude Agent SDK. This toolkit provides access to the same infrastructure that powers Anthropic’s in-house agents. It includes frameworks for managing memory, setting permissions, and coordinating across multiple sub agents. The SDK opens doors for creating more capable and customizable AI assistants tailored to industry-specific needs.
Stronger Safety and Reliability
Anthropic emphasizes that Claude Sonnet 4.5 is its most aligned model so far, equipped with safeguards to reduce risks such as prompt injection attacks. The model is available under the company’s AI Safety Level 3 framework, which ensures stricter filters against harmful or high risk content. This balance of performance and protection positions the model as a reliable tool for professionals and enterprises.
Availability and Pricing
Claude Sonnet 4.5 is now available through the Claude API at the same pricing as the earlier Sonnet 4, making it accessible for existing users without additional cost. Experts across multiple industries are already reporting improvements in accuracy, context awareness, and overall usability.
With Claude Sonnet 4.5, Anthropic is pushing AI further toward becoming a practical assistant capable of handling real world challenges with higher precision. For developers, researchers, and businesses, this release represents a more powerful, safer, and versatile AI system.
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