Is Claude Fable 5 Down? Why It Is Unavailable (June 2026)

Quick Answer

Claude Fable 5 is not down because of a bug or a server outage. Anthropic disabled it on purpose.

On June 12, 2026, the US government issued an export control directive ordering Anthropic to suspend all access to Fable 5 and Mythos 5. The order barred access by any foreign national anywhere in the world. Since there is no way to verify nationality on every API request, Anthropic turned the models off for everyone.

If you are seeing "Fable 5 is currently unavailable," "model disabled," or your API calls to claude-fable-5 are failing, this is why.

What Still Works

Every other Claude model is unaffected:

• Claude Opus 4.8 (claude-opus-4-8): your best available drop-in replacement
• Claude Sonnet 4.6 (claude-sonnet-4-6)
• Claude Haiku 4.5 (claude-haiku-4-5-20251001)

Switch your model ID to claude-opus-4-8 and you are back up. Opus 4.8 is the closest model to Fable in capability and is fully available.

Watch Out for Silent Rerouting

Some users report that Fable 5 still appears to respond. Anthropic may be phasing the shutdown or silently falling back to Opus behind the scenes. Do not assume the model answering your request is the one you asked for. If model identity matters to your workflow, add a check that confirms which model actually served the response.

Will It Come Back?

Anthropic says it believes the directive is based on a misunderstanding and is "working to restore access as soon as possible." There is no confirmed timeline. We are updating this page as the situation develops.

What Actually Happened

The government's stated concern is a "jailbreak" that, per Anthropic, amounts to asking the model to read a codebase and fix its flaws. Anthropic says the vulnerabilities involved were already known, minor, and findable by other models like GPT-5.5 without any bypass.

For the full timeline and the practical fallback steps, see The US Government Just Pulled Fable 5: What Happened. For why this may have happened, see Why the US Government Pulled Fable 5. If Fable was in your production stack, read what model dependency risk looks like now.

Here is our walkthrough of what Fable 5 actually does, recorded before the suspension:

Status Log

• June 12, 2026, 5:21pm ET: Anthropic receives the directive.
• June 12, 2026, evening: Fable 5 and Mythos 5 disabled for all users. Other models unaffected.
• June 13, 2026: No restoration yet. Anthropic says it is working to restore access.