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Enable Flags for Prompt API

Overview

The Prompt API requires specific Chrome flags to be enabled in Google Chrome Canary. Follow the steps below to ensure you have the necessary setup to use Gemini Nano effectively.

Step 1: Enable Optimization Guide

Open a new tab in Google Chrome Canary and navigate to:

chrome://flags/#optimization-guide-on-device-model
  • Set the flag to Enabled BypassPerfRequirement.
  • Restart Chrome Canary.

This step bypasses performance checks to allow the Gemini Nano to be downloaded on your device.

Step 2: Enable Prompt API for Gemini Nano

Open a new tab and navigate to:

chrome://flags/#prompt-api-for-gemini-nano
  • Set the flag to Enabled.
  • Restart Chrome Canary.

Step 3: Confirm Gemini Nano Availability

Open DevTools (F12 or right-click → Inspect) and run the following command in the console:

(await ai.languageModel.capabilities()).available;
  • Result: The expected result should be 'readily'.

Troubleshooting Availability Issues

If the above check fails, proceed with the following steps:

  1. Force API Recognition

    • Open DevTools and run:
    await ai.languageModel.create();

  2. Check Component Download

    • Open a new tab and navigate to:
    chrome://components
    • Look for Optimization Guide On Device Model and ensure that it has a version greater or equal to 2024.9.25.2033.
    • If no version is listed, click Check for update to force the download.

  3. Confirm the Download

    • Once the model is downloaded, re-run the capabilities check:
    (await ai.languageModel.capabilities()).available;
    • Result: 'readily'