---
title: "Anthropic pre-IPO shares slide after US orders shutdown of Fable 5 and Mythos 5"
type: "News"
locale: "en"
url: "https://longbridge.com/en/news/289656963.md"
description: "Anthropic's pre-IPO shares dropped 3.7% to approximately $1,627 after the US government ordered the shutdown of its powerful AI models, Fable 5 and Mythos 5, citing national security concerns over a jailbreak method. Anthropic disputed the evidence and promised further details within 24 hours."
datetime: "2026-06-13T06:03:06.000Z"
locales:
  - [zh-CN](https://longbridge.com/zh-CN/news/289656963.md)
  - [en](https://longbridge.com/en/news/289656963.md)
  - [zh-HK](https://longbridge.com/zh-HK/news/289656963.md)
---

# Anthropic pre-IPO shares slide after US orders shutdown of Fable 5 and Mythos 5

Anthropic’s pre-IPO market sold off after the US government ordered the company to shut down access to its most powerful AI models, Fable 5 and Mythos 5. According to CoinDesk, the Anthropic perpetual on Hyperliquid fell 3.7% on Saturday to about $1,627 after trading above $1,800 following the Fable 5 launch; open interest is about $8.6 million. Anthropic said it received the directive at 5:21 p.m. ET on Friday, citing national security authorities, and executed a full shutdown after being told of a method to jailbreak Fable 5. The company disputed the evidence and said it will share more details within 24 hours.

### Related Stocks

- [ANTH.NA](https://longbridge.com/en/quote/ANTH.NA.md)

## Related News & Research

- [Anthropic: 'We made the wrong tradeoff' in new model guardrails](https://longbridge.com/en/news/289425717.md)
- [How giant IPOs from Anthropic and OpenAI will reshape the stock market's AI trade](https://longbridge.com/en/news/289356322.md)
- [Anthropic rankles users with safety-first Fable release](https://longbridge.com/en/news/289520323.md)
- [Anthropic Abruptly Pulls Fable 5 And Mythos 5 Days After Launch Following US National Security Order, Calls It A 'Misunderstanding'](https://longbridge.com/en/news/289657000.md)
- [What smart people are saying about the sudden export controls on Anthropic's new AI models](https://longbridge.com/en/news/289654435.md)