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Sep 29, 2026
Claude Fable 5.1 + Mythos 5.1 — Cheaper Cache Reads, ZDR, and Looser Cyber Gates
claude-ai
anthropic
model-release
fable-5-1
mythos-5-1
claude-fable-5-1
pricing
prompt-caching
data-retention
enterprise-frontier-safeguards
safeguards
preserved-thinking
watermarking
trusted-access