Summary
- Anthropic’s Claude Fable 5 model offers stronger reasoning and coding abilities while attempting to block dangerous uses. A more powerful Mythos 5 variant is restricted to vetted security users.
- Security experts warn that advanced AI will not invent fundamentally new crypto hacks, but will dramatically speed up finding misconfigurations and constructing ways of exploiting weaknesses such as social engineering, exposed keys and flawed signing flows.
- This year’s largest DeFi losses, totaling more than $840 million, have mostly stemmed from human error and operational failures rather than smart-contract bugs.
The newest AI model from Anthropic, which gives users access to stronger, faster reasoning and coding capabilities, lands in a crypto market beset by security problems and could well exacerbate them.
The company released Claude Fable 5 on Tuesday, the first public model in the Mythos class and, Anthropic says, its most powerful yet. So powerful, in fact, the company released two versions: one for widespread utilize and the other for more restricted distribution.
The public version sports stronger reasoning and coding ability while blocking the most dangerous uses. A less-hamstrung counterpart, Claude Mythos 5, is available only to vetted users in cybersecurity and critical infrastructure.
Experts say Mythos can find and chain zero-day vulnerabilities, or previously unknown software flaws, and help turn a bug into a working attack. Anthropic says the software tries to intercept possible attack vectors by detecting high-risk requests. Once identified, they are routed to a weaker model, Claude Opus 4.8.
The company says this specific fallback triggers in fewer than 5% of sessions. It also stated in a blog post that specialized cybersecurity teams and more than 1,000 hours of external bug-bounty work found no universal way of breaking the system.
