Crypto Users Wary as Anthropic’s Claude Mythos Goes Live
Anthropic launched Claude Mythos, but crypto users warned its capabilities could make exploit-finding cheaper and easier for attackers.
Intelligence analysis by GPT-5.4 Mini
Anthropic’s new Claude Mythos model is being released with safeguards, but parts of the crypto community see it as a fresh risk. Their concern is that advanced AI could lower the bar for finding and replaying DeFi exploits, even as Anthropic says the model is safe for general use.
Anthropic made a very smart new robot helper, and some people in crypto worry it could help thieves spot weak locks in money programs faster. Others think the bigger danger is not the money programs themselves, but the messy parts around them, like passwords and websites.
Analysis
What Anthropic released
Anthropic launched the first public version of its Claude Mythos model, called Fable 5, and said it is designed for general use with safeguards. The company said some sensitive topics, including cybersecurity, are redirected to another model, Claude Opus 4.8.
Why crypto users are concerned
The worry in crypto is not just that the model can write code or analyze systems, but that it could help attackers find weak points in smart contracts and operational setups at lower cost. Venture capitalist Simon Dedic argued on X that the cost and skill needed to find exploitable flaws in smart contracts may drop dramatically. He warned that unaudited protocols could become easy targets and that old exploits could be reused on forks repeatedly.
A counterview from DeFi
Curve Finance co-founder Michael Egorov pushed back on the idea that the model will automatically translate into a wave of smart contract hacks. He argued that bug-hunting in large software systems does not map cleanly onto compact DeFi contracts, where humans and ordinary AI may already reason well enough. In his view, the more realistic risk may be operational-security failures and supply-chain attacks on frontend dependencies rather than direct contract exploits.
The bigger backdrop
The article notes that crypto theft has recently remained high, with April’s stolen value reaching $629.7 million, the highest since February 2025. Anthropic also said Mythos uncovered more than 10,000 high- or critical-severity vulnerabilities in important software, and around 6,200 such issues across open-source projects in Project Glasswing. Anthropic said only a small group of cybersecurity and infrastructure providers will get access to the more permissive Claude Mythos 5 version.
Key points
- Anthropic released the first public version of Claude Mythos, branded as Fable 5, with safeguards for general use.
- Some crypto users fear the model could make it much cheaper to find exploitable flaws in smart contracts.
- Simon Dedic warned that unaudited DeFi protocols could become easy targets and old exploits could be replayed on forks.
- Michael Egorov said the bigger risk may be operational security and frontend supply-chain attacks, not direct DeFi contract bugs.
- Anthropic said only a small group of cybersecurity and infrastructure providers will get access to a less restricted version.
If Anthropic’s safeguards work as intended, the model could still help security teams find weaknesses before criminals do. The limited access version may also reduce the chance of broad abuse while keeping advanced defensive testing available to trusted users.
If attackers adapt the model for misuse, DeFi teams with weak audits could face faster and cheaper exploit attempts. The article also suggests that operational-security lapses and frontend supply-chain attacks may become more common even if smart contracts themselves are not the main target.
