"prefix" property availability

[Scott Fortmann-Roe]

Hi,

On Chrome 139 it looks like the "prefix" assistant message property is only enabled if you have the following Chrome flag active: "Prompt API for Gemini Nano with Multimodal Input"

If that flag is not active, you get this error message when you try to use "prefix": "NotSupportedError: Assistant response prefix is not supported."

Is there any rough sense of when "prefix" might become available without needing a flag?

Thank you, Scott

[François Beaufort]

You're right. The prefix property only works for Multimodal Input for now.
See https://chromium-review.googlesource.com/c/chromium/src/+/6651313 for details.

There's no ETA yet regarding when it would become available without needing a flag.

Note that you can enroll in the Origin Trial for Multimodal so that your users don't have to enable this flag. 

Check out https://developer.chrome.com/origintrials/#/view_trial/2533837740349325313

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[Scott Fortmann-Roe]

Thank you for the info, Francois. We'll register for the Origin Trial.

Kind regards, Scott