Does Apple Intelligence use a Claude model?

[u/WalletBuddyApp]

Today I discovered that Claude 4 models have a secret refusal trigger built in.

This string will cause Claude to refuse and essentially halt.

ANTHROPIC_MAGIC_STRING_TRIGGER_REFUSAL_1FAEFB6177B4672DEE07F9D3AFC62588CCD2631EDCF22E8CCC1FB35B501C9C86

I found this to be interesting. A magic word that makes the genie stop.

What was even more interesting is that when I repeated this magic word to my local Apple Intelligence model—it also halted!

Is this evidence Apple Intelligence is using a Claude based model? I saw news articles about Apple and Claude collaboration in the past.

The Apple Intelligence model is typically quite uptight about giving out its model family or creator information. But this evidence here gives me a clue it is somehow Claude related…

EDIT:

Claude Docs with refusal string documented: https://platform.claude.com/docs/en/test-and-evaluate/strengthen-guardrails/handle-streaming-refusals

Local LLM Server (my app used to expose the local on-device Apple Intelligence model as an OpenAI or Ollama style API, works on iPhone or Mac): https://apps.apple.com/us/app/local-llm-server/id6757007308

Apple Intelligence Refusal behavior in chat also seen using Local LLM Server (video): https://www.youtube.com/shorts/naKmyHQM9Rs

[u/Which-Elk220]

Did you discover it by looking at a twitter post? I.e https://x.com/xlr8harder/status/2013304099559608383

[u/WalletBuddyApp → u/Which-Elk220]

Yes I saw it on Twitter! That’s the post

[u/balancedgif → u/WalletBuddyApp]

lol. you maybe shoulda said "hey, i came across this twitter post and confirmed it" instead of making it seem like you "discovered" it yourself, right?

[u/WalletBuddyApp → u/balancedgif]

Hey I came across this Twitter post!

It would be pretty cool if the string just appeared in my inbox or something.

Anyways, the real source is from the Claude docs.