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FoundationModels.ContextSize
The maximum context size (in tokens) supported by the model.
| Component | Version | macOS | Windows | Linux | Server | iOS SDK |
| FoundationModels | 16.2 | ✅ Yes | ❌ No | ❌ No | ✅ Yes, on macOS | ✅ Yes |
MBS( "FoundationModels.ContextSize"; FoundationModel ) More
Parameters
| Parameter | Description | Example |
|---|---|---|
| FoundationModel | The identifier for the model. | $model |
Result
Returns number or error.
Description
The maximum context size (in tokens) supported by the model.This is new in macOS/iOS 26.4.
The context size represents the total number of tokens that can be used in a single session, including both input prompts and generated responses.
Returns an error if the context size cannot be determined. Typically this is due to the model not being available or Apple Intelligence is disabled.
Examples
Query context size:
Set Variable [ $Size ; Value: MBS("FoundationModels.ContextSize"; $$session) ]
Show Custom Dialog [ "Maximum Context Size" ; $size ]
Example result: 4096
Show Custom Dialog [ "Maximum Context Size" ; $size ]
Example result: 4096
See also
Release notes
- Version 16.2
- Added FoundationModels.ContextSize and FoundationModels.TokenCount functions for macOS/iOS 26.4.
Example Databases
Blog Entries
This function is free to use.
Created 10th April 2026, last changed 11st April 2026
FoundationModels.CloseSession - FoundationModels.GetMaximumResponseTokens
