# FreeFable — 300+ security leaders ask the White House to lift the Fable 5 ban

> Bruce Schneier, Alex Stamos, Katie Moussouris and 300+ security execs publicly ask the White House to reverse the Fable 5 and Mythos 5 export controls.

- Org: FreeFable Coalition
- Date: 2026-06-14
- Category: security, article
- Source: https://freefable.org
- Canonical page: https://ai-tldr.dev/releases/freefable-cybersecurity-open-letter-jun14/

## In short

Bruce Schneier, Alex Stamos, Katie Moussouris and 300+ cybersecurity executives sign an open letter calling the export controls on Anthropic's Fable 5 and Mythos 5 a 'misguided' action that hurts defenders more than attackers.

## What it is

FreeFable is an open letter signed by over 300 cybersecurity executives, researchers, and CISOs urging the White House to lift the export-control directive that took Anthropic's Fable 5 and Mythos 5 offline on June 12. Signatories include Bruce Schneier, Alex Stamos, Katie Moussouris of Luta Security, Bugcrowd's Casey Ellis, Rachel Tobac of SocialProof Security, and Paul Vixie.

## How it works

Moussouris — the only outside expert to read the third-party paper that triggered the ban — says the so-called jailbreak was researchers asking the model to 'fix this code' after a 'review for vulnerabilities' request was refused. Patching a vulnerable file inherently requires identifying the vulnerability. The letter argues this is standard defender work and that comparable capabilities exist in GPT-5.5, Claude Opus 4.8, and Chinese frontier models. The signatories ask for scientific, transparent, and minimally restrictive future regulation.

## Why it matters

Anthropic's Fable 5 and Mythos 5 have been offline since June 12. The signatories say cutting defenders off from frontier models while attackers can still reach equivalent systems is a strategic loss. The letter and parallel reporting from The Atlantic, TechCrunch, Axios, and Fortune are now the public counter-pressure on the directive — a major test of how AI export controls will be applied going forward.

## Who it's for

security researchers, AI policy watchers, anyone tracking the Fable 5 fallout

## Try it

https://freefable.org

## Quick facts

- Type: Open letter
- From: FreeFable Coalition (300+ cybersecurity leaders)
- Addressed to: U.S. White House (Sec. Lutnick, National Cyber Director Cairncross)
- Models affected: Anthropic Fable 5 and Mythos 5
- The ask: Lift the export-control directive that took the models offline on June 12, 2026
- Notable signatories: Bruce Schneier, Alex Stamos, Katie Moussouris, Casey Ellis, Rachel Tobac, Paul Vixie

## FAQ

### What is the FreeFable open letter?

FreeFable is an open letter signed by over 300 cybersecurity executives, researchers, and CISOs. The letter urges the White House to lift the export-control directive that took Anthropic's Fable 5 and Mythos 5 models offline on June 12, 2026. Signatories include Bruce Schneier, Alex Stamos, Katie Moussouris, Casey Ellis, Rachel Tobac, and Paul Vixie.

### Why do the signatories want the Fable 5 export controls lifted?

The signatories argue that the export controls on Fable 5 and Mythos 5 hurt defenders more than attackers. They say cutting US security teams off from frontier models is a strategic loss while attackers can still reach equivalent systems, naming GPT-5.5, Claude Opus 4.8, and Chinese frontier models as comparable. The letter calls the directive misguided.

### What triggered the ban on Fable 5 and Mythos 5?

A third-party paper triggered the export-control directive. Katie Moussouris, the only outside expert to read it, says the so-called jailbreak was researchers asking the model to 'fix this code' after a request to 'review for vulnerabilities' was refused. The letter argues that patching a vulnerable file inherently requires identifying the vulnerability, which is standard defender work.

### What does the FreeFable letter ask the government to do?

The FreeFable letter asks the White House to lift the export-control directive on Anthropic's Fable 5 and Mythos 5 models. It also asks for future AI regulation to be scientific, transparent, and restrictive only to the minimal extent necessary. The letter is addressed to Secretary Lutnick and National Cyber Director Cairncross.

## Links

- [Open Letter](https://freefable.org)
- [Luta Security](https://www.lutasecurity.com/post/the-fable-5-export-controls-harm-us-cyber-defense)
- [TechCrunch](https://techcrunch.com/2026/06/15/cybersecurity-vets-protest-dangerous-us-government-ban-on-anthropics-most-powerful-models/)
- [Fortune](https://fortune.com/2026/06/15/fix-this-code-three-words-behind-us-government-shut-down-anthropic-fable-mythos-ai-models-katie-moussouris-open-letter/)
- [CyberScoop](https://cyberscoop.com/cybersecurity-experts-anthropic-fable-5-not-unique-ai-threat/)