Strict RAG implementation via .required tool calling and temp=0

Machine Learning & AI Foundation Models
Zaid OP
Created Jun ’26
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This post is from the WWDC26 Foundation Models Q&A.

Any guidance if we want the iOS 27 SystemLanguageModel to always defer to our app for all answers and not its built-in training for responses

Answered by Frameworks Engineer in 893018022

You can use .toolCallingMode with DynamicProfiles for this.

https://developer.apple.com/documentation/foundationmodels/languagemodelsession/dynamicprofile/toolcallingmode(_:)

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Frameworks Engineer OP
Apple
Jun ’26
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You can use .toolCallingMode with DynamicProfiles for this.

https://developer.apple.com/documentation/foundationmodels/languagemodelsession/dynamicprofile/toolcallingmode(_:)

Strict RAG implementation via .required tool calling and temp=0
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