Anthropic rolls out public version of Mythos without cybersecurity capability
The model blocks high-risk requests and falls back to Claude Opus 4.8, while Anthropic says early testing found no universal jailbreaks in over 1,000 hours.
- Anthropic officially launched "Claude Fable 5" on Tuesday, commercially releasing a public, heavily safeguarded version of its highly powerful "Mythos" artificial intelligence architecture.
- The debut follows a highly restrictive two-month private rollout of the original "Mythos Preview" model in April, which alarmed Wall Street, central banks, and global governments due to its unprecedented ability to automatically find and exploit critical software vulnerabilities.
- Fable 5 represents a massive leap in raw analytical power, marking the first public AI model to break 90% on the core Hex benchmark for highly complex, multi-run, and long-horizon analytical tasks.
- To mitigate severe misuse risks, the model features aggressive routing guardrails; any prompt asking about high-risk topics like cybersecurity or biology is automatically downgraded to the less permissive Claude Opus 4.8, triggering a fallback in roughly 5% of user sessions.
- Simultaneously, a fully unrestricted "Claude Mythos 5" was deployed via the defensive cybersecurity initiative "Project Glasswing," keeping the raw, un-guardrailed model strictly limited to a small group of infrastructure providers and U.S. government cyberdefenders.
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Claude has released its new Fable 5 model, an advanced model that's supposedly on par with Mythos. With its limited availability, here's what you need to know. A look at what Claude can really do. Presumably on par with Mythos, according to Anthropic's announcement about the Fable 5 model, the new model appears quite similar to Mythos, as it was placed alongside Mythos 5 on a performance graph. The company says it's designed to handle the longes…
The AI company Anthropic has allegedly put its too powerful "mythos" model in chains and let it go under the name "Fable 5" to normal users. The goal is clear: to inspire the imagination of investors before the company goes to the stock exchange.
Anthropic launches Claude Fable 5, bringing its once-restricted Mythos AI to the masses ahead of IPO - Tech Startups
Just two months ago, Anthropic said its most capable AI model was too risky for broad release. Now the company is putting a Mythos-class model in the hands of paying customers. On Tuesday, Anthropic announced Claude Fable 5, a new […] The post Anthropic launches Claude Fable 5, bringing its once-restricted Mythos AI to the masses ahead of IPO first appeared on Tech Startups.
Tech Radar
technewstube.comAnthropic spent months saying Mythos was too dangerous to release — then it launched a public version called Fable 5 that it warns ‘comes with risks’
Anthropic has released a public version of its Mythos model called Fable 5, but acknowledges that it 'comes with risks' despite providing guardrails.
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