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AI fans have been in awe since rumors first leaked in April about Anthropic’s Claude Mythos Preview — an AI prototype that the company claimed It can discover a lot of cybersecurity vulnerabilities Which, if left unchecked, can break the Internet. That’s why Anthropic has slowed down its release.
Anthropic on Tuesday released the first model in the Mythos family that everyone can use: the Claude Fable 5.
in Extensive blog postAnthropic explained why Fable 5 is the company’s most advanced AI model while maintaining safety barriers. The company says the model offers improvements to help people with software engineering and cognitive work, and that it is better at understanding images and other non-text topics. Apparently, it also beat Pokemon FireRed by using the AI Belt just for vision, something previous models failed to do.
Everyone wants to know what the Mythos family of models can do, but they require a lot of computing power to run. For this reason, Anthropic doesn’t make it available cheap. Within two weeks, the company will start charging subscribers additional fees to use Fable 5.
Is Cloudable 5 safe?
Anthropic said Claude Fable 5 is the most secure version of Claude Mythos 5, and only trusted cybersecurity and software professionals should be able to access Mythos 5 through Anthropic’s Project Glasswing software. The Fable model has cybersecurity protections that Mythos does not.
“Fable 5 has complied with zero malicious single-turn requests related to cyberattack planning, development exploits, or defensive evasion,” the company said. “This determines whether or not a request uses any of 30 different public jailbreak techniques.”
AI-assisted bioterrorism — a terrifying phrase and an even more terrifying truth — has been a concern for leading AI labs in recent months. For this reason, Anthropic has decided not to allow Fable 5 to answer most questions related to biology and chemistry, at least for now. These questions will instead be directed to another model, Opus 4.8.
Anthropic said it was working “in consultation” with the US government on plans to release Cloud Mythos 5. Mythos was largely responsible for the film. The White House’s latest push To force AI companies to submit any new AI models for government review before they are released. This plan is not yet in effect.
In a change, Claude’s business users will now have to agree to a 30-day data retention policy. Anthropic said the data will be used to help the company defend against future cyberattacks and misuse of AI, not to train new AI models.
Anthropic calls Fable 5 its “most capable model yet.”
How to use CloudFable 5
Fable 5 is now available to Claude subscribers, but will be rolled out “more conservatively, in phases,” Anthropic said in a blog post. The model will be available to paid subscribers — on the Pro, Max, Team, and Enterprise plans — from now until Monday, June 22. The next day, Tuesday, June 23, Fable 5 will be removed from subscribers’ options list.
You’ll still be able to use Fable 5 after the initial release period, but you’ll need to burn usage credits. These are special “pay-as-you-go” credits that allow you to continue using Claude even after you reach your maximum limit. You may already have usage credits included in your subscription, especially if you’re on an enterprise plan. But if you don’t have any usage credits or exceed your allotted amount, you’ll see additional charges on your next bill.
Developers can use Fable 5 now in the Claude API, priced at $10 per million input tokens and $50 per million output tokens.
Notice the message that pops up when you select Fable 5, where it reads that Fable 5 uses twice the amount of usage compared to the Opus models.
Anthropic’s unusual rollout plan is likely due to capacity concerns. Fable 5 uses twice as much as Anthropic’s Opus model set, according to a menu that pops up on Claude when you select Fable 5. The company says it expects demand to be high. So, to meet this demand and keep Cloud online, the initial availability period is only a few weeks.
Anthropic said it aims to eventually make Fable 5 available as part of its paid plans, but there’s no set timeline on when or if that could happen.
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