
Cody Blakeney
21.5K posts

Cody Blakeney
@code_star
Leading research at @arcee_ai | Formerly Data Research Lead @DbrxMosaicAI | Visiting Researcher @meta | Ph.D | #TXSTFOOTBALL fan | https://t.co/4G6Jf3b0V4





Put hummus on a falafel and my Arab friend said 'he is dipping the mother in the child'

This was all allegedly triggered by a Mythos jailbreak that was shared with the US Government. This is Anthropic's response: 'To date, the government has only given us verbal evidence of a potential narrow, non-universal jailbreak, which essentially consists of asking the model to read a specific codebase and fix any software flaws. Our understanding is that one potential jailbreak was shared with the government. We have reviewed a report that we believe is the basis of the government's directive and validated that the level of capability displayed there is widely available from other models (including OpenAI’s GPT-5.5), and is used every day by the defenders who keep systems safe. We will share more details over the next 24 hours.'



An underrated part of this discussion is that (a) there's huge leverage in improving data, and (b) there's no way Anthropic could safeguard this xAI could instruct Fable to look through EVERY row of pretraining data and fix any typos and errors. this probably the single highest-leverage activity for a lab playing catchup and it's not possible for Anthropic to prevent this without completely kneecapping the model itself, because data quality work looks like any other kind of knowledge work ("check this text for errors", "rewrite this in a formal tone")


The US government, citing national security authorities, has issued an export control directive to suspend all access to Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States, including foreign national Anthropic employees. The net effect of this order is that we must abruptly disable Fable 5 and Mythos 5 for all our customers to ensure compliance. Access to all other Claude models is not affected. We apologize for this disruption to our customers. We believe this is a misunderstanding and are working to restore access as soon as possible. Read our full statement: anthropic.com/news/fable-myt…

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