The Memo - Special edition - Claude Fable 5 - 9/Jun/2026
Claude Mythos 5 and Claude Fable 5, two configurations of a new large language model from Anthropic.
To: US Govt, major govts, Microsoft, Apple, NVIDIA, Alphabet, Amazon, Meta, Tesla, Citi, Tencent, IBM, & 10,000+ more recipients…
From: Dr Alan D. Thompson <LifeArchitect.ai>
Sent: 9/Jun/2026
Subject: The Memo - AI that matters, as it happens, in plain English
AGI: 97%
ASI: 2/50Anthropic announces Claude Fable 5
Once again, we have this out to The Memo readers within a few minutes(!) of model release, and just 63 days after the announcement of Claude Mythos.
This is a new class of model, following the literary forms naming scheme used by Anthropic:
Haiku: ~20B, small, fast model class named after short Japanese poetry.
Sonnet: ~1T, mid-to-high model class named after a structured 14-line poem.
Opus: ~5T, top regular model class named after a major artistic work or composition.
Fable: ~6T, from Latin fabula, “that which is told”.
Mythos: ~6T, Greek term for myth, story, or narrative tradition.
Claude Mythos 5 and Claude Fable 5, two configurations of a new large language model from Anthropic. Because of the powerful capabilities of this model, we are releasing it in these two forms: Fable 5, which is for general use but comes with additional safeguards that block its ability to perform tasks in high-risk domains such as biology and cybersecurity; and Mythos 5, which has relevant safeguards lifted but is only made available to a small number of trusted partners…
Both models should be considered proto-ASI. You can view my 50 lagging indicators at LifeArchitect.ai/ASI.