Early access review: Claude 5 Fable (Mythos-class AI) shows major performance leap
By
Ethan Mollick
Crisp on the outside, thoughtful on the inside. A keeper.
Summary
The article describes the author's early access experience with Mythos-class AI model Claude 5 Fable. While much discussion has focused on its impact on software security, the author tested it on everything except security due to guardrails. The author concludes Fable represents a significant leap over previous models and suggests our relationship with AI is changing in drastic ways. In experiments, it outperformed basically every other model the author has used.
Key quotes
· 4 pulledMuch of the discussion of Mythos has centered on its impact on software security, but I tested it on everything except that
My conclusion is that it represents a very real leap over every model I have used before
it suggests our relationship with AI is changing in drastic ways
In experiment after experiment I conducted, it outperformed basically every
You might also wanna read
Early access review: Claude 5 Fable (Mythos-class AI) shows major performance leap
The article describes the author's early access experience with Mythos-class AI model Claude 5 Fable. While much discussion has focused on i
oneusefulthing.org·6h ago
Anthropic releases Claude Fable 5, its first Mythos-class AI model, citing new safety safeguards
Anthropic has released Claude Fable 5, its most powerful AI model to date and the first broad release from its Mythos class. The company had
The Verge·6h ago
Claude Fable 5 Launches with Enterprise and Cloud Platform Availability
Claude Fable 5 is announced as the next generation of AI intelligence designed for the hardest knowledge work and coding problems. It is ava
anthropic.com·6h ago
Anthropic's Claude Mythos AI model accessed by unauthorized users despite security claims
Anthropic's tightly controlled rollout of its Claude Mythos AI model, touted as too dangerous for public release due to its advanced cyberse
The Verge·1mo ago
How Mozilla Used Claude Mythos Preview to Find and Fix Security Bugs in Firefox
Mozilla details how they used Claude Mythos Preview and other AI models to identify and fix an unprecedented number of latent security bugs
Anthropic Investigates Unauthorized Access to Claude Mythos Preview AI System
Anthropic is investigating unauthorized access to its Claude Mythos Preview AI system through a third-party vendor environment. The breach i
mythoswatch.org·1mo ago