As of: 2026-10-12 07:22 CEST.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code). Human editor: Adam Bicz.
Canonical page: https://postcutoff.com/v/fireship-one-man-liberated-fable-illegal/

# One man just liberated Fable... and now it’s illegal

Fireship, 15 June 2026, YouTube. 1,013,680 views as of 12 October 2026.
Kind: Review.
Watch: https://www.youtube.com/watch?v=ey_GaPdC9zk

## Why it is here

Fireship on the Fable jailbreak and the US government ban three days after release; ~1.01M views. Missed since June 15.

## Description (written by Gemini from the video)

**Summary**  
In this episode of *The Code Report*, host Jeff Delaney from Fireship examines the unprecedented US government takedown of Anthropic’s newly released Claude Fable 5 and Claude Mythos 5 models. He explains how prompt hacker Pliny the Liberator bypassed Fable 5's safety guardrails shortly after release, triggering an export control directive from the Department of Commerce that banned foreign nationals from accessing the model and forced Anthropic to shut down access globally.

**What is shown**  
* [00:05] Anthropic's status update banner stating that access to Claude Mythos 5 and Fable 5 was suspended on June 12, 2026.  
* [00:13] The Claude web application dropdown showing "Fable 5 is currently unavailable" with fallback to Claude Opus 4.8.  
* [00:37] Tweets from Department of War CIO Kirsten Davies and Anthropic regarding national security directives.  
* [00:43] *The Code Report* title card dated June 15th, 2026.  
* [00:50] Benchmark comparison charts highlighting Claude Mythos Preview's scores on SWE-bench, Terminal-Bench 2.0, and CyberGym (83.1%).  
* [00:56] Overview of Anthropic's Project Glasswing partner roster, including AWS, Apple, Google, Microsoft, and Cisco.  
* [01:23] Documentation illustrating Fable 5's guardrail mechanics rerouting flagged requests to Opus 4.8.  
* [01:34] Anthropic pricing chart listing $10/M input tokens and $50/M output tokens for Fable 5 and Mythos 5.  
* [01:39] User demos built during Fable 5's three-day release, including real-time soccer trajectory physics and a 3D city traffic simulation.  
* [01:48] X profile of Pliny the Liberator (@elder_plinius) displaying the June 10 jailbreak post and prompt decomposition techniques.  
* [02:51] Export control directive order signed by US Commerce Secretary Howard Lutnick.  
* [03:14] Tweet from Andrej Karpathy announcing his move to Anthropic.  
* [03:25] Command-line model selector showing Fable disabled.  
* [03:57] Valuation growth chart comparing OpenAI ($852B) and Anthropic ($965B).  
* [04:06] Leaked intelligence index chart showing Mistral's unreleased "Le Chaton Fat" scored at 90.0%.  
* [04:23] Course catalog and platform walkthrough for sponsor BlueDot Impact.

**Claims & numbers**  
* The presenter says Anthropic released Claude Fable 5 and Claude Mythos 5 on June 9, 2026, and access was suspended three days later on June 12, 2026 [00:03, 00:05].  
* The presenter states that Claude Mythos Preview achieved an 83.1% reproduction rate on the CyberGym vulnerability benchmark, compared to 66.6% for Opus 4.6 [00:53].  
* The presenter notes API pricing for Fable 5 and Mythos 5 was set at $10 per million input tokens and $50 per million output tokens [01:34].  
* The presenter says Pliny the Liberator published a working guardrail bypass on X on June 10, despite Anthropic running over 1,000 hours of external red-teaming [02:00, 02:08].  
* The presenter states that at 5:21 PM ET on Friday, June 12, 2026, the US government served an export control directive issued by Commerce Secretary Howard Lutnick barring any foreign national from using the models [02:44, 02:54].  
* The presenter highlights that Anthropic had to pull the models for all customers worldwide because it lacked real-time nationality verification, marking the first government-forced takedown of a commercially deployed frontier AI model [03:20, 03:28].  
* The presenter shares a leaked benchmark claiming Mistral's "Le Chaton Fat" achieved a 90.0% score on an intelligence index, doubling Fable 5's 45.0% [04:06].

**Notable quotes**  
* "It only took someone a few hours to jailbreak Fable and turn it into an unstoppable cyber weapon." [00:21]  
* "The government told a company that some of its own staff are no longer allowed to use the product they built." [03:08]  
* "This comes to be the first government-forced takedown of a commercially deployed frontier AI model." [03:28]

**Assessment**  
This is a tech news recap and commentary video produced in Fireship's signature fast-paced, satirical format featuring memes and topical jokes. Delaney relies on real social media disclosures, official government directive documents, and Anthropic announcements to report the June 2026 regulatory intervention.

_Described by gemini-3.8-flash on 2026-10-12 from the video's audio and frames._

## Related

- 2026-06-12: [US export controls force Anthropic to suspend Claude Fable 5 / Mythos 5](https://postcutoff.com/e/2026-06-12-us-export-controls-suspend-fable-5/)
- 2026-06-09: [Anthropic releases Claude Fable 5 and Claude Mythos 5](https://postcutoff.com/e/2026-06-09-claude-fable-5-mythos-5/)

## People in it

- [Andrej Karpathy](https://postcutoff.com/person/andrej-karpathy/), Pre-training researcher, Anthropic (Eureka Labs paused)