Claude Fable/Mythos 5.1: New SOTA Model, 75% Cache Price Cut but 70% More Output Tokens

Anthropic has released Claude Fable 5.1 and Mythos 5.1 as its new flagship models for coding and knowledge work, claiming they are the world's most advanced. The cache read price is cut by 75%, but output token usage increases by 70%, resulting in a 20% net cost increase per task. The launch has garnered over 12 million views, highlighting its significance in the AI community.