Statement on the US government directive to suspend access to Fable 5 and Mythos 5
The US government issued an export control directive requiring Anthropic to suspend access to its Fable 5 and Mythos 5 models for all foreign nationals. Anthropic will disable these two models for all customers while leaving other models operational. The directive references a potential jailbreak technique, which Anthropic says is comparable to capabilities already available in other AI systems such as OpenAI’s GPT‑5.5.
- ▪The US government directed that access to Fable 5 and Mythos 5 be blocked for any foreign national, including Anthropic employees abroad.
- ▪Anthropic must immediately disable Fable 5 and Mythos 5 for all customers to comply, but other Anthropic models are unaffected.
- ▪The order cites a suspected method of bypassing the models, described as a narrow jailbreak involving code review and flaw fixing.
- ▪Anthropic argues that the demonstrated capability is already widely available in other models, including OpenAI’s GPT‑5.5, and will provide further details within 24 hours.
3 outlets in our directory ran this story. All of the coverage we found sits in one bucket: centre. That one-sidedness is itself worth noticing.
- ▪ US Government directive to suspend access to Fable 5 and Mythos 5 — Anthropic
- ▪ As a result of a US Government directive, we are suspending access to Fable 5 — X (formerly Twitter)
Simon Willison files mainly under blogs. We currently carry 51 of its stories.
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Record
| Original publisher | Simon Willison's Weblog |
| Canonical URL | https://simonwillison.net/2026/Jun/13/us-government-directive-to-suspend-access/#atom-everything |
| Publication time | 2026-06-13T01:01:50+00:00 |
| Retrieval time | 2026-06-13T01:31:53.881Z |
| Last seen | 2026-06-13T01:31:53.881Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | Ivhq5wM4Rq06 · 3 stories |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
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| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
The US government, citing national security authorities, has issued an export control directive to suspend all access to Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States, including foreign national Anthropic employees. The net effect of this order is that we must abruptly disable Fable 5 and Mythos 5 for all our customers to ensure compliance. Access to all other Anthropic models will not be affected. We received the directive from the government today at 5:21pm (ET). The letter did not provide specific details of its national security concern. Our understanding is that the government believes it has become aware of a method of bypassing, or "jailbreaking" Fable 5.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at Simon Willison's Weblog.
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