Need help with Gemini Nano API not injecting in Chrome Canary

Hello,

I’m working on the on-device Gemini Nano APIs in a Chrome extension, but they don’t seem to be injected.

Even though the model shows as Ready (GPU) in chrome://on-device-internals (Chrome Canary v144 on macOS) and all the required flags are enabled, both window.ai and chrome.ai remain undefined.

Console shows:
Uncaught TypeError: Cannot read properties of undefined (reading 'languageModel')

I’ve tried restarting Chrome, reloading the extension, and waiting for the model to initialize, no luck so far.
Is this a known limitation in Canary 144, or do extensions need additional access to use window.ai / chrome.ai?

Any insights or confirmations from the Chrome team or other developers would be greatly appreciated!

Thanks,
Azkhan

3 comments
François Beaufort Manager • 7 months ago

Do not use window.ai or chrome.ai. Use LanguageModel. See https://developer.chrome.com/docs/ai/prompt-api#use_the_prompt_api
Azkhan Abdul Salam • 7 months ago

Thank you, it has been really helpful during this crucial time. I appreciate that!
Lukman Abdulsalam • 7 months ago

This is really helpful.
is there also a need to add the specific api in the extension permission @francois,
for example, if i am using the prompt_api, should it be included in the permissions?

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Need help with Gemini Nano API not injecting in Chrome Canary

3 comments