# The US lifts its block on Mythos 5 > Source: > Published: 2026-06-26 22:48:28+00:00 Letter: the US lifts its block on Mythos 5, allowing Anthropic to release it to more than 100 US institutions; sources: talks about Fable 5 are ongoing (Semafor) (Visit Techmeme dot com for the link and full context!)