Artificial intelligence company Anthropic has launched Claude Fable 5, its most advanced AI model available to the public. The model is based on the company’s previously restricted Mythos platform and aims to offer powerful capabilities while maintaining strong safety protections.
Claude Fable 5 is built on the same foundation as Claude Mythos 5, an advanced AI system that was earlier accessible only to a select group of organisations through Anthropic’s Project Glasswing programme. Access to Mythos had been limited due to concerns about its ability to identify software vulnerabilities and perform sophisticated cybersecurity tasks.
According to Anthropic, Fable 5 offers significant improvements in coding, scientific research, reasoning, visual analysis and other knowledge-based tasks. The company says the model delivers stronger performance than previous versions of Claude and can handle more complex and long-duration assignments.
To address safety concerns, Anthropic has introduced several safeguards in Fable 5. The model is designed to restrict responses in sensitive areas such as cybersecurity, biology and chemistry. For certain high-risk requests, the system can automatically switch users to a less powerful but safer model, Claude Opus 4.8.
The release comes amid growing debate over the risks and benefits of increasingly capable AI systems. Earlier versions of Mythos reportedly demonstrated advanced vulnerability-discovery abilities that attracted attention from governments, cybersecurity experts and technology companies.
Anthropic said the model underwent extensive testing and safety evaluations before its public launch. The company believes the safeguards built into Fable 5 allow broader access to advanced AI capabilities while reducing the risk of misuse.
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