Anthropic Launches Claude Sonnet 5 as Lower-Cost Agentic Model and Introduces Claude Science Scientific Workbench
English summary
Anthropic released Claude Sonnet 5, its most agentic Sonnet model with improved reasoning, tool use, and coding. Entry API pricing is $2/million input tokens and $10/million output tokens until August 31, 2026, then reverting to $3 and $15, while a new tokenizer may increase token consumption by up to 35%. The model is default for Free and Pro users and available via API and Claude Code. Simultaneously, Anthropic launched Claude Science beta, a scientific workbench integrating over 60 skills and databases for reproducible research and on-premises data processing, with a project grant program. The announcements follow Anthropic's IPO filing and reported $47 billion revenue run rate.
Chinese summary
Anthropic 发布 Claude Sonnet 5，称其为最具 agent 能力的 Sonnet 模型，在推理、工具调用和编程上有所提升。直到2026年8月31日，API 优惠价为输入每百万tokens 2美元、输出10美元，之后恢复为3美元和15美元；新的分词器可能导致相同文本的 token 消耗增加至多1.35倍。该模型为 Free 和 Pro 用户的默认模型，其他方案及 API 均可使用。同期推出 Claude Science 测试版，是面向科研人员的 workbench，集成60余项科学技能和数据库连接，支持可重复研究和本地数据处理，并提供项目资助。消息发布正值 Anthropic 提交 IPO 招股书草案，其收入运转率达470亿美元。
Key points
Claude Sonnet 5 released as the most agentic Sonnet model, with improved reasoning, tool use, and coding, positioned as a lower-cost alternative to Opus 4.8.
Claude Sonnet 5 发布，是最具 agent 能力的 Sonnet 模型，提升了推理、工具调用和编程，定位为 Opus 4.8 的低成本替代方案。
Introductory API pricing ends August 31, 2026 ($2/$10 per million input/output tokens), then standard ($3/$15); new tokenizer may increase token count by 1.0–1.35x.
API 优惠定价截至2026年8月31日（输入/输出每百万 tokens 为2/10美元），随后恢复标准价（3/15美元）；新分词器可能使 token 量增加1.0–1.35倍。
Claude Science beta launched for researchers, integrating 60+ scientific skills, database connections, on-premises processing, and native rendering of scientific objects, with grant support.
推出 Claude Science 测试版，面向科研人员，集成60余项科学技能、数据库连接、本地数据处理和科学对象原生渲染，并提供项目资助。
Safety enhancements include better refusal of harmful requests and resistance to prompt injection, though bad behavior rate remains higher than Opus 4.8.
安全性增强：更好地拒绝有害请求和抵抗提示注入，但不良行为率仍高于 Opus 4.8。
Anthropic has confidentially filed for an IPO and disclosed a revenue run rate of $47 billion and a $965 billion post-money valuation after Series H.
Anthropic 已秘密提交 IPO 招股书，收入运转率达470亿美元，Series H 融资后估值达9650亿美元。