Modelpeers

Claude Fable 5 and Mythos 5

2 models from Anthropic

New release

Claude Fable 5 released, with Claude Mythos 5 for Glasswing partners

Claude Fable 5 launched as a generally available Mythos-class model at $10 / $50 per million tokens, with safety classifiers that route some requests to Claude Opus 4.8. Claude Mythos 5 is the same model with fewer safeguards, limited to Project Glasswing partners.

Who is affected:
Anyone choosing a top-tier Claude model on the API or in the Claude apps.
What to do:
Expect some cyber-related requests to fall back to Opus 4.8, and plan for 30-day data retention on the API.

Source

"Fable 5 and Mythos 5 are being offered at $10 per million input tokens and $50 per million output tokens"

Anthropic news: Claude Fable 5 and Claude Mythos 5

Published

Open the sourceanthropic.com

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