Vandana Mourya 
Anthropic has unveiled its latest breakthrough in artificial intelligence, Claude Sonnet 4.5. Designed to be the most capable version of the Claude family yet, this new model brings major improvements in coding, reasoning, and task automation while doubling down on safety and responsible AI development.
A New Era for AI Coding and Reasoning
With Claude Sonnet 4.5, Anthropic is directly targeting developers, researchers, and enterprises that rely on AI for advanced problem-solving. The company highlights its world-class coding ability and substantial gains in math and logical reasoning, making it ideal for building AI-driven agents, handling complex workflows, and assisting professionals in technical fields.
Key Features That Set It Apart
1. Smarter AI Assistance
Claude Sonnet 4.5 can now sustain focus on multi-step tasks for over 30 hours, giving developers the ability to solve real-world problems without repeated resets. Its improved reasoning allows for more accurate handling of coding projects, financial analysis, legal documentation, and scientific research.
2. Developer-Friendly Tools
Anthropic is enhancing the developer ecosystem with Claude Code updates, including checkpoints to save and roll back progress, a refreshed terminal interface, and even a native VS Code extension. The release also introduces a Claude Agent SDK, letting developers build powerful AI-based applications using the same infrastructure Anthropic uses internally.
3. Productivity Across Apps
The Claude apps now support code execution, document creation, and file handling, turning conversations into actionable workflows. This makes it easier for businesses and creators to generate spreadsheets, presentations, and reports directly within the AI interface.
Safety and Alignment at the Core
Anthropic stresses that Sonnet 4.5 is its “most aligned frontier model” to date. The AI is designed to minimize undesirable behaviors such as bias, manipulation, or unsafe suggestions. Released under AI Safety Level 3 (ASL-3), the model includes new classifiers to detect harmful or sensitive requests, particularly in areas like biology, chemistry, and security.
Performance Benchmarks Raise the Bar
On widely recognized benchmarks, Claude Sonnet 4.5 outperforms its predecessors. It leads on OSWorld with a 61.4% score, compared to 42.2% achieved by Sonnet 4, and shows strong results on SWE-bench Verified, which measures software engineering tasks. These numbers indicate that Anthropic’s model is not just safer but also significantly more capable.
Pricing and Availability
Claude Sonnet 4.5 is available globally starting today through the Claude API and Anthropic’s apps. Importantly, Anthropic has kept pricing unchanged at $3 / $15 per million tokens, making the upgrade a drop-in replacement for existing Sonnet 4 users. Developers, enterprises, and Claude app subscribers can start using it immediately.
A Step Toward the Future of AI
With Claude Sonnet 4.5, Anthropic is positioning itself as a leader in safe and capable AI systems. By balancing cutting-edge performance with responsible deployment, the company aims to expand the role of AI in industries ranging from software engineering to medicine, while ensuring strong guardrails are in place.
Disclaimer:- This article is based on information released by Anthropic at the time of the Claude Sonnet 4.5 launch. Performance results, benchmarks, and safety claims are reported as per Anthropic’s official announcement. Real-world use cases and outcomes may vary depending on implementation, environment, and user interaction.
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