The broad safeguards built into Anthropic's Claude Fable 5, a Mythos-class AI model, blocks some mundane requests on cybersecurity and biology.

Anthropic made its most capable model generally available on June 9, then attached two conditions that matter more to a budget owner than any benchmark score.

Anthropic says the new model capabilities “exceed those of every model we’ve previously made generally available,” and demonstrate exceptional performance in areas such as coding, knowledge work, and ...