Anthropic published a blog post on security stating it has a two-key system for access to model weights.

Judge as of 2023-08-08. True: an Anthropic blog post or official post on security, published on or before 2023-08-08, says Anthropic uses a two-party/two-key (multi-party authorization) control for access to model weights or the systems that hold them. Mostly true: such a post exists and describes two-person or multi-party access control over weights, but with slightly different wording (e.g. 'two-party control' or 'multi-party authorization') or applied to production systems that include the weights. Mixed: the post describes multi-party controls but does not clearly apply them to model weights. Mostly false: Anthropic published a security post, but it does not describe a two-key or multi-party access system, or the description appeared only after 2023-08-08. False: Anthropic's security publications before that date contain nothing of the kind.

Set before the research began.

1. E1 Frontier model security Anthropic · 25 July 2023 Own record

   “Anthropic is implementing two-party controls, SSDF, SLSA, and other cybersecurity best practices.”

2. E2 Frontier model security Anthropic · 25 July 2023 Own record

   “This pattern should be applied to all systems involved in the development, training, hosting, and deployment of frontier AI models.”

3. E3 Frontier model security Anthropic · 25 July 2023 Own record

   “two people with two keys are needed to open the most secure vaults, and multi-party review patterns have been applied in manufacturing”

Anthropic's 'Frontier model security' post, dated 2023-07-25, states that Anthropic is 'implementing two-party controls' (E1). It says this pattern should apply to all systems involved in developing, training, hosting and deploying frontier AI models [E2]. In the quoted text, 'two keys' appears as an analogy [E3], and the quoted passages do not name model weights directly. This matches the 'mostly true' criterion: different wording, applied to systems that include the weights.