How to get context window size and other parameters

[Colin Mummery]

I have Nano working consistently well in my HTML/JS SPA using the Prompt and Rewriter APIs. Is there a way I can query the model to get the context window size and other parameters? Gemini 3.0 seems to think there's a function called capabilities but that doesn't exist.

[Chi Yo Tsai]

Hi Colin,

The inputQuota and inputUsage attribute of the model object should give you the context window size.
> const m = await LanguageModel.create();

> await m.append('Hello! How are you?')

> m.inputUsage

< 11

> m.inputQuota

< 9216

 You can also access the topK and temperature parameter of the model for the sampling parameter.