Anthropic 发布 Fable 5.1：成本更低、限制更少
Anthropic 新模型 Fable 5.1 成本更低、限制更少，还支持零数据保留，企业可自建运行。值得关注的是其安全策略的转变。
Anthropic 发布双生模型 Fable 5.1 和 Mythos 5.1：前者面向普通用户，后者仅限网络安全和生命科学合作方。新版本降低了 token（模型处理文本的计量单位）成本，并允许企业客户在自己服务器上运行且不泄露数据。安全系统仍会监控滥用，但监控方式由客户控制。
正文摘录
On Tuesday, Anthropic released Fable and Mythos 5.1, twinned versions of the company’s most advanced AI model. In addition to performance upgrades, the new Fable release includes changes meant to reduce token cost and false-positive restrictions from the model’s safeguards. As with the previous Mythos model, Mythos 5.1 will only be available to registered Anthropic partners engaged in either cybersecurity or life sciences research. Fable 5.1, the unrestricted version, is available starting today on cloud platforms or through the Anthropic API. One of the most significant changes is Anthropic’s [previously reported](https://www.axios.com/2026/08/19/openai-previews-zero-retention-safety-system-as-anthropic-requires-data-logs) embrace of zero data retention, allowing clients to run Anthropic …