Claude Mythos 5.1 and Fable 5.1: Capabilities

Zvi (Don't Worry About the Vase) · 1 month ago · 23 ● 5 sources

Claude Fable 5.1 was released alongside discussion of its relative capabilities versus other leading models like GPT-6 Astra. Cache reads on Fable 5.1 are priced at $0.25 per million tokens, down from $1. As a result, users get lower per-token costs, fewer safeguard interventions, optional zero data retention for eligible customers, and improved performance across multiple coding and agentic benchmarks.