Claude Fable 5 Officially Launches Today, Built on Mythos Base with Added Safety Guardrails
English summary
Claude Fable 5 is released as the most significant model advancement since Claude 4.5, described as the best widely available model. It is built on a Mythos base with enhanced safety guardrails and praised by Andrej Kapathy. The model achieves top-tier performance across software engineering, knowledge work, vision, and scientific reasoning, especially excelling on complex, long-horizon tasks. Pricing is set at $10 per million input tokens, $50 per million output tokens, and $1 for cached input. The model will be available on Cola at its original price.
Chinese summary
Claude Fable 5 正式发布，被称为自 Claude 4.5 以来最重要的模型进步，也是当下可广泛使用的最佳模型。它基于 Mythos 底座构建，增加了安全护栏，并获得 Andrej Kapathy 的高度评价。该模型在软件工程、知识工作、视觉识别和科学研究等几乎所有 AI 能力基准测试中均达到顶尖水平，且在复杂、耗时任务上的领先优势更加明显。定价为输入每百万 token 10 美元，输出每百万 token 50 美元，缓存输入 1 美元，将按原价上线 Cola 平台。
Key points
Claude Fable 5 launches as the biggest advancement since Claude 4.5.
Claude Fable 5 作为自 Claude 4.5 以来的最大进步正式上线。
Built on Mythos base with additional safety guardrails.
基于 Mythos 底座构建，并增加了安全护栏。
Andrej Kapathy endorsed it with “Free your mind” comment.
Andrej Kapathy 以“解放你的思想”评价该模型。
Excels in complex, long-horizon tasks across software engineering, knowledge work, vision, and science.
在软件工程、知识工作、视觉和科学等领域的复杂长时任务中表现卓越。
Pricing: $10/1M input, $50/1M output, $1/1M cached input; available on Cola.
定价：输入 10 美元/百万 token，输出 50 美元/百万 token，缓存 1 美元；将上线 Cola 平台。