The same underlying model will be split between general API access and restricted use for selected cybersecurity and life sciences partners. Anthropic has launched Claude Fable 5 for general use while keeping Claude Mythos 5 restricted to selected trusted access partners Anthropic has launched Claude Fable 5 for general use while keeping Claude Mythos 5, the same underlying model with some safeguards lifted, restricted to selected cybersecurity , infrastructure, and future life sciences partners