Claude Fable 5
Claude Fable 5 is Anthropic's first Mythos-class model, surpassing Opus 4.8 in software engineering, knowledge work, vision, and scientific research, priced at $10/$50 per million in/out tokens and available via API, Bedrock, and Vertex AI. Access was suspended June 12–30, 2026 due to a US export-control directive, then restored July 1 with a new cybersecurity classifier, and biology-safeguard false positives were reduced on August 7, 2026.