Anthropic于10月7日发布Claude Haiku 5.5，已提供Claude Platform API，并宣布在AWS、Google Cloud和Azure开放。相较Haiku 4.5，新版首次为Haiku系列加入可调思考力度：简单任务少想一些，困难任务多用一些推理资源。它仍是面向高频短任务的小模型；开发者SDK的浏览器与电脑操作支持则处于beta，不能把模型开放理解成所有功能都已成熟。

Anthropic released Claude Haiku 5.5 on October 7 through the Claude Platform API and announced availability on AWS, Google Cloud and Azure. Compared with Haiku 4.5, the new release introduces adjustable reasoning effort to the Haiku family for the first time: less reasoning for simple tasks and more resources for difficult ones. It remains a small model intended for frequent, short tasks. Support for browser and computer operation in the developer SDK is in beta, so model availability should not be taken to mean that every feature is mature.

适合先试的用途是工单分类、文档摘要，以及给大型代理做资料提取的子代理。以百万token计，提示不超过10万token时，官方输入／输出价为0.10／0.50美元；超过门槛为0.50／2.50美元，Haiku 4.5对应为1／5美元。这是标价变化，整项任务是否省钱还取决于思考、工具调用和返工。SDK负责串起操作循环，但浏览器、驱动与权限检查仍由开发者配置。这里的分工思路是：让小模型完成边界清楚、容易检查的步骤，把需要综合判断的结果留给主流程。不要把一份长任务硬拆成许多小调用后，就假设总成本一定下降。

Plausible starting points include support-ticket classification, document summarization and subagents that extract information for larger agents. Per million tokens, official input and output prices are $0.10 and $0.50 when a prompt does not exceed 100,000 tokens; above that threshold, they are $0.50 and $2.50. The corresponding Haiku 4.5 prices are $1 and $5. Those are changes in list prices. Whether a complete task becomes cheaper also depends on reasoning, tool calls and rework. The SDK connects the operation loop, but developers still have to configure the browser, drivers and permission checks. The underlying division of labor is to give a small model clearly bounded steps whose outputs are easy to check, while leaving results that require broader judgment to the main workflow. Splitting a long task into many small calls should not, by itself, be assumed to reduce total cost.

迁移文档提示，同一段输入文字在新分词方式下约多计30% token，实际增幅因内容而异；旧的手动思考预算参数会报错，不能直接照搬。官方也承认复杂代理编码仍更适合Sonnet或Opus。本次未做独立实测，不把厂商排行榜当作真实流程成功率。SDK默认不检查网址，示例驱动也不是生产代码；能操作网页不等于能安全接管已登录账号。所读资料未逐一确认各云区域和账号资格。

The migration guide says that the new tokenization method counts roughly 30% more tokens for the same input text, although the actual increase varies with content. The old manual reasoning-budget parameter causes an error and cannot be carried over unchanged. Anthropic also acknowledges that Sonnet or Opus remains better suited to complex agentic coding. This review did not conduct independent testing and does not treat vendor benchmark rankings as production success rates. The SDK does not check URLs by default, and its example drivers are not production code. The ability to operate a web page does not establish that a system can safely take over a signed-in account. The reviewed material was not used to verify every cloud region and account-eligibility condition individually.

建议先用一组固定、匿名化的真实任务对照Haiku 4.5，分别记录正确率、耗时、拒答、重试和总账单，再比较不同思考力度。将短提示与超过10万token的任务分开，避免被平均单价掩盖差别。若低价伴随更多人工纠错，或关键流程因参数变化失败，就应缩小部署范围；本文的用途判断是待测试假设。

A sensible initial test is to compare Haiku 5.5 with Haiku 4.5 on a fixed set of anonymized real tasks, recording accuracy, completion time, refusals, retries and the full bill, then comparing different effort settings. Short prompts and tasks exceeding 100,000 tokens should be evaluated separately so that an average unit price does not hide their differences. If lower prices come with more human correction, or critical workflows fail because parameters have changed, deployment should be narrowed. The proposed uses in this article remain hypotheses to be tested.