Generable
Asked on 06/12/2025
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The term "Generable" refers to a macro in the Foundation Models framework introduced by Apple. It allows developers to generate structured data using Swift types. By applying the generable macro to structs and enums, developers can create a schema at compile time, which the model uses to produce the expected structure. This macro also generates an initializer that is automatically called when making a request to a session, allowing for the generation of instances of the structure.
Generable is particularly useful for ensuring structural correctness and avoiding the need for manual parsing of the model's output. It uses a technique called constrained decoding to prevent the model from making structural mistakes, such as generating invalid field names. This makes it a powerful tool for generating structured output from on-device large language models (LLMs).
For more details, you can refer to the session Deep dive into the Foundation Models framework (07:57).
Deep dive into the Foundation Models framework
Level up with the Foundation Models framework. Learn how guided generation works under the hood, and use guides, regexes, and generation schemas to get custom structured responses. We’ll show you how to use tool calling to let the model autonomously access external information and perform actions, for a personalized experience. To get the most out of this video, we recommend first watching “Meet the Foundation Models framework”.
Meet the Foundation Models framework
Learn how to tap into the on-device large language model behind Apple Intelligence! This high-level overview covers everything from guided generation for generating Swift data structures and streaming for responsive experiences, to tool calling for integrating data sources and sessions for context management. This session has no prerequisites.
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