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Anthropic redeploys its top model after a two week government review, adds a new classifier, and caps usage at 50 percent through July 7
Claude Fable 5 is live again for users around the world as of Wednesday, July 1. The redeployment came after Anthropic and the US government spent about two weeks reviewing the model. Commerce Secretary Howard Lutnick confirmed the approval in a post on X.
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Mythos 5, the unrestricted version of the same model, is back too. But only for a set of approved US organizations, following government sign off on June 26.
The pause traces back to a vulnerability that Amazon reported. Anthropic says the fix is a new safety classifier. It sits between your prompt and the model. It decides whether a request is normal or an attempt to slip past the guardrails. The company claims it should catch 99 percent of bypass attempts.
If your request gets blocked, you will see a notice. The request then routes to Opus 4.8 instead of failing outright.
There is a cost. Anthropic admits the classifier may flag harmless requests, especially during routine coding and debugging. So if you paste a normal script and get blocked, it may not be you. The company says it is working to bring false positives down.
Access comes with limits. Pro, Max, Team, and select Enterprise plans get Fable 5 for up to 50 percent of weekly usage through July 7. After that it moves to usage credit pricing. Access through AWS, Google Cloud, and Microsoft Foundry is still being restored.
Two things stand out here. First, a government now sits inside the release cycle of a frontier model. Approval took two weeks, and users noticed the wait. That is worth watching.
Second, safety and usability are pulling against each other in public. Anthropic shipped a classifier it openly says will block some honest work. The practical move is simple. Keep Opus 4.8 in your workflow as a fallback, and watch your Fable 5 usage before July 7, because credits start after that.
The model that gets reviewed before release is the model that matters most now. Fable 5 just became the clearest example of that.
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Fable 5 features that matter
Anthropic's most capable public model, built on the same base as Mythos 5.
1 million token context window, with up to 128k output tokens per request.
Longest autonomous work of any Claude model, and the gap widens as tasks get longer.
Strong at software engineering, knowledge work, vision, memory, and research. Stripe ran a codebase wide migration across 50 million lines of Ruby in one day.
Pricing is 10 dollars per million input tokens and 50 dollars per million output tokens.
A new safety classifier now blocks the reported jailbreak in over 99 percent of tries, though it may flag honest coding work.
Blocked requests reroute to Opus 4.8 instead of failing. Biology and chemistry requests also fall back to Opus 4.8 for now.
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