Anthropic's Claude 4.5, specifically Claude Sonnet 4.5, is the latest iteration in the Claude family of large language models, released on September 29, 2025. Anthropic is positioning Claude 4.5 as the "best model in the world" for coding, complex agents, and computer use. It aims to enhance business solutions and customer engagement through improved AI capabilities. Claude 4.5 is designed to perform better on real-world development work, like writing and refactoring code, running longer agentic workflows, and operating computers and tools with greater reliability.
Enhanced AI Capabilities Claude 4.5 brings several key improvements: * Coding Performance: Claude 4.5 is considered the best coding model, demonstrating state-of-the-art performance on software engineering benchmarks. It excels at tasks across the entire software development lifecycle, from planning to debugging and refactoring. * Reasoning and Agentic Autonomy: The model showcases stronger reasoning and more robust state tracking across long sessions. This translates to fewer "lost context" moments and more dependable multi-step plans, beneficial for tasks like data pipelines and documentation generation. It can also handle 30+ hours of autonomous coding. * Tool Use: Claude 4.5 exhibits improved tool parameter handling and more precise tool use, reducing retries and "hallucinated" parameters. It is also surprisingly efficient at maximizing actions per context window through parallel tool execution, for example running multiple bash commands at once. * Long-Context Handling: Claude 4.5 supports large contexts with improved retrieval and state tracking across long tasks. This is valuable for managing large codebases, multi-document research, and long-form content. * Computer Use: Claude 4.5 can interact with applications and interfaces like a human by clicking, typing, and navigating menus. On the OSWorld benchmark, which tests AI models on real-world computer tasks, Sonnet 4.5 leads with 61.4%.
Improving Business Solutions
Claude Sonnet 4.5 delivers practical business value through consistent performance and advanced problem-solving abilities. Several companies are already using Claude to drive transformation across their businesses: * Cybersecurity: Claude Sonnet 4.5 can be used to deploy agents that autonomously patch vulnerabilities before exploitation, shifting from reactive detection to proactive defense. It reduced average vulnerability intake time for Hai security agents by 44% while improving accuracy by 25%. * Financial Analysis: Claude Sonnet 4.5 delivers investment-grade insights for complex financial analysis, such as risk assessment and portfolio screening, requiring less human review. * Legal Workflows: The model is state-of-the-art on complex litigation tasks, including analyzing full briefing cycles and conducting research to synthesize opinion drafts for judges. * Software Development: Netflix noted that Claude Sonnet 4.5 is excellent at software development tasks, learning codebase patterns to deliver precise implementations and transforming development velocity.
Enhancing Customer Engagement
Claude 4.5 can significantly improve customer engagement:
- Personalized Customer Messages: United Airlines uses Claude to deliver more personalized customer messages and speed up response times.
- Improved Customer Service: SK Telecom in South Korea improved customer service quality by 34% using Claude.
- Fraud Prevention: The Commonwealth Bank of Australia reduced customer scam losses by 50% with Claude.
- Customer Support Automation: Claude can handle ticket triage, complex inquiries, and multi-step support workflows with a casual tone and conversational responses.
Availability and Pricing
Claude Sonnet 4.5 is available via the Claude API and accessible on the Claude Developer Platform, Amazon Bedrock, and Google Cloud's Vertex AI. Pricing remains the same as Claude Sonnet 4, at $3 per million input tokens and $15 per million output tokens.
