Claude Mythos 5.1Claude Mythos 5.1（Anthropic）
Anthropic 2026-09-01 与 Fable 5.1 同期发布的「孪生模型」：同一套底层权重，但在生物与网络安全领域采用更宽松的护栏策略。仅通过 Project Glasswing（可信访问计划）向审核过的网络安全与生命科学机构开放，不接受个人申请；其能力同时支撑面向企业客户的 Claude Security 产品线。规格与 Fable 5.1 一致：1M 上下文、128K 最大输出、$10/$50 每百万 tokens、缓存读 $0.25。Anthropic's 'twin' release shipped 2026-09-01 alongside Fable 5.1: the same underlying weights with looser guardrails around biological and cybersecurity work. Access is limited to vetted cybersecurity and life-science organisations through Project Glasswing (trusted access); individuals cannot apply. The same capability underpins the Claude Security product line for enterprise customers. Specs match Fable 5.1: 1M context, 128K max output, $10/$50 per million tokens, cache reads at $0.25.
模型参数与规格Specifications
| 厂商 | Anthropic |
| 类型 | 对话大模型 |
| 参数规模 | 未公开 |
| 开源/闭源 | 闭源 |
| 架构 | 未公开 |
| 上下文窗口 | 1M |
| 最大输出 | 128K |
| 输入价格 | $10/M tokens |
| 输出价格 | $50/M tokens |
| 语言 | 多语言 |
| 发布时间 | 2026-09 |
| 评分 | 4.9 / 5 |
| 能力 | chat、vision、function、reasoningchat、vision、function、reasoning |
| 标签 | 对话、推理、安全、受限Chat、Reasoning、Security、Restricted |
| 优点 | 网络安全能力最强档、护栏宽松，适合防御方研究、1M 上下文 + 缓存读 $0.25Strongest-tier cybersecurity capability、Looser guardrails for defensive research、1M context with $0.25 cache reads |
| 注意事项 | 需审核，不面向个人开放、全站最高价档、仅限特定机构场景Vetted access only, not open to individuals、Among the most expensive tiers on this site、Limited to specific institutional use cases |
打开微信「扫一扫」，分享给好友或朋友圈
关闭关于 Claude Mythos 5.1 的常见问题Frequently Asked Questions about Claude Mythos 5.1
Claude Mythos 5.1 是免费的吗？Is Claude Mythos 5.1 free?
Claude Mythos 5.1 目前以付费 API / 平台调用为主，可关注官方是否提供免费试用额度。Claude Mythos 5.1 is mainly available via paid API/platform calls; watch for official free trial quotas.
Claude Mythos 5.1 的上下文窗口有多大？How large is Claude Mythos 5.1's context window?
Claude Mythos 5.1 的上下文窗口为 1M，适合处理长文档与多轮复杂对话。Claude Mythos 5.1's context window is 1M, suitable for long documents and multi-turn complex dialogue.
Claude Mythos 5.1 是开源还是闭源？Is Claude Mythos 5.1 open-source or closed-source?
闭源模型，主要通过官方 API 或平台使用。Closed-source model, mainly available via official API or platform.
Claude Mythos 5.1 适合用来做什么？What is Claude Mythos 5.1 good for?
Claude Mythos 5.1 的主要能力包括 chat、vision、function、reasoning，可用于相关场景的创作、分析与自动化任务。Claude Mythos 5.1's main capabilities include chat、vision、function、reasoning, usable for creation, analysis and automation in related scenarios.