加量不加价，一篇说明白 Claude Sonnet 4.5 强在哪

Core Viewpoint - Anthropic has launched the Claude Sonnet 4.5 model, claiming it to be the best coding model in the world, with a focus duration of over 30 hours for complex multi-step tasks, surpassing OpenAI's GPT-5 Codex [2][9]. Pricing and Cost Efficiency - The pricing for Claude Sonnet 4.5 remains the same as its predecessor, at $3 per million tokens for input and $15 per million tokens for output. Cost savings of up to 90% can be achieved through prompt caching, and batch processing can save 50% [2]. Developer Tools and Integration - Anthropic has introduced the Claude Agent SDK and an experimental feature called "Imagine with Claude" for developers, allowing integration with platforms like Amazon Bedrock and Google Cloud's Vertex AI [3][26]. Performance Metrics - In the SWE-bench Verified evaluation, Claude Sonnet 4.5 achieved industry-leading scores, with a 61.4% score in the OSWorld benchmark, significantly improving from the previous model's 42.2% [10][12]. Enhanced Features - The model includes new features such as a checkpoint function in Claude Code, context editing, and memory tools, enabling it to handle longer tasks and more complex operations [4][24]. Application and Usability - Users can interact with Claude Sonnet 4.5 through the Claude.ai website and mobile applications, with integrated functionalities for code execution and file creation directly within conversations [5][6]. Safety and Alignment - Claude Sonnet 4.5 is noted for its improved alignment and safety features, reducing undesirable behaviors such as deception and flattery, and making significant progress in defending against prompt injection attacks [24][25]. Experimental Features - The "Imagine with Claude" feature allows real-time software generation, showcasing the model's capabilities in adapting to user requests without pre-written code [31][33]. Recommendations - Anthropic recommends all users upgrade to Claude Sonnet 4.5 for enhanced performance across all applications, with updates available for both the Claude Code and developer platform [34].