[nixosbestos]

Right, sorry, I'm trying to catch up (in general) here, and am working through assumptions to get my bearings.

What you say makes sense, but further adds to my confusion as to why those model names would appear in input sent to Claude at all, then. EDIT: I guess it might be because someone might point Claude at a compatible API, with its model in the URL, which is of interest to them.

[sebastiennight]

Yes I think that's the theory. I also noticed something today - when a stakeholder asked if Claude had an affiliate program, my instant response was "no" (because why would they need to deal with that) but a quick search surfaced that there are websites that actively present themselves as "Claude" official sellers/resellers, and simply act as a middleman proxy for the Anthropic/bedrock API.

It's unclear to me if they do this to arbitrage on API costs or to steal data, but it makes sense that Anthropic would be interested in detecting when traffic is being proxied to them.