# Anthropic releases Claude Fable 5.2 and Mythos 5.2, cutting prices 20%

> Original title: 人类最强模型 Claude Fable 5.2 和 Mythos 5.2 发布。

- Source: Orange AI
- Published: 2026-11-09T23:21:00.000Z
- Bad Influence: https://badinfluence.news/items/u9x4wdvsocpwfhwizadowu4wr
- Original: https://x.com/oran_ge/status/2119933301767180631

## Summary

Orange AI reports that Anthropic has released Claude Fable 5.2 and Mythos 5.2, which it describes as the strongest models yet, with most capabilities above Opus 5.5. Input pricing falls to $8 and output to $40 per million tokens, down 20% from $10 and $50, and generation is 30% faster than 5.1. The post says Fable 5.2 High matches Opus 5.5 Max on FrontierCode 2.0 at half the per-task cost, and Mythos 5.2 is positioned for more open-ended technical work and has a biology-capable version.

## Post

人类最强模型 Claude Fable 5.2 和 Mythos 5.2 发布。
几乎所有能力都超过了 Opus 5.5 。
这是人类目前最前沿的大模型，没有之一。

一句话简单总结：
人类目前最强模型，价格下降20%，速度提升30%，编程办公不在话下，生物医药和机器人都能搞定。

这是核心信息的快速笔记：
1. 虽然更为智能了，但模型的安全对齐方面，比以往模型都要好或持平（可能使用了他们研究里所说的讲故事对齐法）
2. 几乎所有能力都超过 Opus 5.5，而且沟通风格更加清晰明了
3. 生成速度相比上一代的 5.1 快了 30%
4. 在 FrontierCode 2.0 测试中，Fable 5.2 High 就能打平 Opus 5.5 Max，但每任务成本只要一半。需要注意的是 Fable 5.2 在  Xhigh 时得分最高，比 Max 都高。思考努力程度并非越高越好。
5. 基因疗法可以通过一种称为衣壳的蛋白质外壳进行递送。Mythos 5.2 发现了一种预测整个衣壳结构的新方法。它准确地模拟了其尝试的 34 个衣壳中的 28 个。生物学家可以使用它来更快、更便宜地设计衣壳。
6. 由 1,000 个 Fable 5.2 Agents 组成的团队在 30 小时内完全形式化了费马大定理，将证明翻译成一种计算机可以逐步检查的语言。在相同的设置下，Opus 5.5 在 18 小时内仅完成了 26%，并且在 30 小时后几乎没有取得更多进展。
7. Mythos 5.2 在控制物理机器人方面展现了显著提升的技能，即使是在它从未明确接受过训练的任务上。（和 Astra 一样具备了机器人方面的泛化能力，在其他模型上暂未观察到）在 RoboDojo 上，这是一个带有模拟双臂机器人的基准测试，它超越了其他模型以及大多数专为控制机器人而构建的 AI 系统。
8. 官方建议是，大多数 Coding 和知识任务，建议使用 Opus 5.5 起手，把最具雄心、开放式的技术工作交给 Mythos 和 Fable。
9. 价格方面，8 美元输入，40 美元输出，较之前的 10 美元和 50 美元下降了 20%。

这两个模型是同一个模型的不同版本，Fable 定位更为大众，Mythos 则开放了生物等安全领域。

## AI translation

The strongest model for humanity, Claude Fable 5.2 and Mythos 5.2, has been released.
Almost every capability surpasses Opus 5.5.
This is currently the most cutting-edge large model for humanity, without a doubt.

In one sentence:
It is currently the strongest model for humanity, with a 20% price reduction and a 30% speed increase. Programming and office work are a breeze, and it can handle biomedicine and robotics too.

Quick notes on the key information:
1. Although it is smarter, its safety alignment is better than or on par with previous models (it may have used the "storytelling alignment" method mentioned in their research).
2. Almost all capabilities surpass Opus 5.5, and its communication style is clearer and more concise.
3. Generation speed is 30% faster than the previous generation, 5.1.
4. In the FrontierCode 2.0 test, Fable 5.2 High can tie with Opus 5.5 Max, but at half the cost per task. Note that Fable 5.2 scores highest at Xhigh, even higher than Max. Higher reasoning effort is not always better.
5. Gene therapies can be delivered via a protein shell called a capsid. Mythos 5.2 discovered a new method for predicting the entire capsid structure. It accurately modeled 28 of the 34 capsids it attempted. Biologists can use it to design capsids faster and more cheaply.
6. A team of 1,000 Fable 5.2 Agents fully formalized Fermat's Last Theorem in 30 hours, translating the proof into a language that a computer can check step by step. Under the same setup, Opus 5.5 completed only 26% in 18 hours and made almost no further progress after 30 hours.
7. Mythos 5.2 demonstrates significantly improved skill in controlling physical robots, even on tasks it was never explicitly trained for. (Like Astra, it has robotics generalization ability, which has not yet been observed in other models.) On RoboDojo, a benchmark with a simulated dual-arm robot, it outperforms other models and most AI systems built specifically for robot control.
8. The official recommendation is that for most coding and knowledge tasks, start with Opus 5.5, and hand the most ambitious, open-ended technical work to Mythos and Fable.
9. On pricing: $8 input and $40 output, down 20% from the previous $10 and $50.

These two models are different versions of the same model. Fable is positioned for the general public, while Mythos is opened up for security-sensitive areas such as biology.