Source: Understanding AI
by Timothy B Lee
“On Tuesday, Anthropic released two new models — Claude Mythos 5 and Claude Fable 5. Under the hood, the two models are very similar. Both are variants of Claude Mythos Preview, the model Anthropic announced — but didn’t release publicly — two months ago. What differentiates them is how they’re being released. The new version of Mythos, like the original, will only be available to handpicked organizations under Project Glasswing. These trusted partners will have relatively unfettered access. Fable, in contrast, is available to the general public. But it comes with some significant restrictions.” (06/10/26)
https://www.understandingai.org/p/anthropic-has-caught-up-to-openai