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].

Core Insights - Anthropic has officially released Claude Sonnet 4.5, which is defined as the world's strongest code model, showcasing significant breakthroughs in agent construction, computer usage, reasoning, and mathematical capabilities [2][3]. Performance and Benchmarking - Sonnet 4.5 achieved top performance in various authoritative tests, including a 77.2% score in SWE-bench Verified for real software coding capabilities, and a 61.4% score in OSWorld for simulating real computer tasks, up from 42.2% in the previous version [4][10][13]. - The model demonstrated a 100% success rate in high school math competitions and improved performance in graduate-level reasoning and multilingual Q&A [4][10]. New Features and Product Upgrades - The release includes significant updates across the Claude product line, such as the introduction of "Checkpoints" in Claude Code, allowing users to save progress and revert to earlier states [6]. - Claude API has added context editing features and memory tools, enabling agents to run longer and handle more complex tasks [6][34]. Developer Resources - A new core resource, Claude Agent SDK, has been introduced, providing foundational capabilities for building intelligent agents [8][9]. - The SDK is designed to support a wide range of applications beyond coding, facilitating the development of autonomous agents for complex tasks [32]. Safety and Alignment - Sonnet 4.5 is noted for its improved alignment and safety features, significantly reducing harmful behaviors and enhancing defenses against prompt injection attacks [28][31]. - The model is released under the AI Safety Level 3 framework, incorporating various protective measures, including classifiers for sensitive content [31]. Pricing and Access - The pricing for Sonnet 4.5 remains consistent with Sonnet 4, set at $3 per million tokens for input and $15 per million tokens for output [35]. - The model is accessible through multiple channels, including Claude API, Amazon Bedrock, and Google Cloud Vertex AI [37]. Industry Impact - Claude Sonnet 4.5 is positioned as a powerful tool for developers and professionals in fields such as finance, medicine, and research, marking a significant advancement in AI capabilities and safety [40].

克雷西 发自 凹非寺 量子位 | 公众号 QbitAI 最强编程模型让位了。 但没有换人，依然是Claude。 新发布的 Claude Sonnet 4.5 ，在SWE-bench上的成绩比Sonnet 4提升了1.8个百分点，而且提质不加价。 而且有第三方表示，Claude Sonnet 4.5 能一口气工作30个小时，完全自主地编写代码 。 在这30个小时里，Claude Sonnet 4.5写了11000多行代码，构建出了类似Slack的聊天应用。 此前Opus 4曾因为连续工作7小时就备受关注，现在这个数字直接变成了4倍多。 计算机操作方面，Claude Sonnet 4.5在OSWorld测试中取得了60.2分的SOTA成绩，比Sonnet 4提升了近一半。 总之，Claude Sonnet 4.5在多项领域都实现了对自己的超越，成为该领域内的最佳模型。 先有昨晚的DeepSeek-V3.2，紧接着又是Claude Sonnet 4.5，赶在节前密集上新的模型，看来是真的不让人放假了。（手动狗头） 多项指标超越自我 来看Anthropic晒出的Claude Sonnet 4.5成绩单。 除了已经介绍 ...

Core Insights - The article discusses the recent advancements in AI models, particularly the release of Claude Sonnet 4.5 by Anthropic, which is positioned as a leading model in various benchmarks and applications [1][4][5]. Model Performance - Claude Sonnet 4.5 achieved significant performance improvements in various benchmarks, including: - 77.2% in Agentic coding [2] - 82.0% in SWE-bench Verified [2] - 61.4% in OSWorld for computer use, up from 42.2% in the previous version [11] - The model shows enhanced capabilities in reasoning and mathematics, with a perfect score of 100% in high school math competitions [12][13]. Developer Tools and Features - Anthropic introduced the Claude Agent SDK, allowing developers to create their own intelligent agents [4][35]. - New features include checkpoint functionality for saving progress, a revamped terminal interface, and native VS Code extensions [8][4]. Safety and Alignment - Claude Sonnet 4.5 is noted for being the most aligned model to human values, with improvements in reducing undesirable behaviors such as flattery and deception [27][5]. - The model is released under AI safety level 3 (ASL-3), incorporating classifiers to detect potentially dangerous inputs and outputs [32]. User Experience and Applications - Early user experiences indicate that Claude Sonnet 4.5 performs exceptionally well in specialized fields such as finance, law, and STEM [13][21]. - The "Imagine with Claude" feature allows real-time software generation without pre-defined functions, showcasing the model's adaptability [36][38].