Fable 5
3 published articles
Cost vs. capability
The $1.40 model that crushed its $2.82 sibling on physics
Four AI models were asked to build interactive destruction scenes with real physics. Opus 5 passed all three at the lowest cost among top performers, while Fable 5 failed each one at twice the price. A reminder that price tags don't predict physics.
2026-07-25
Export Control Directive
The US just shut down two AI models. Here's why Anthropic says it was a mistake.
Anthropic received a US government directive to suspend Fable 5 and Mythos 5 access over a potential jailbreak. The company disagrees with the decision, stating the vulnerabilities are narrow and found in other models, and is working to restore service.
2026-07-10
AI Safety
Anthropic's jailbreak severity scale is a proposal that could reshape ai safety regulation
Anthropic proposes a four-axis scoring system for AI jailbreak severity, from 'informational' to 'critical,' and details the classifiers that block dangerous cybersecurity uses of Fable 5. The framework, developed with Glasswing partners, aims to standardize how the industry and regulators talk about model misuse.
2026-07-08