Chrome: enable built-in AI
Step-by-step for Chrome Stable, Beta, or Canary.
- Update Chrome to the latest version (138+ recommended). For earliest access, install Chrome Canary.
- Navigate to chrome://flags/#optimization-guide-on-device-model and set it to Enabled.
- Navigate to chrome://flags/#prompt-api-for-gemini-nano and set it to Enabled (or Enabled multilingual for non-English support).
- Click Relaunch at the bottom of the flags page.
- After relaunch, open chrome://on-device-internals and check the Model Status tab. Wait for the model download to complete (this can take several minutes on first run).
- Open the demo page, click Run Built-in Tests, and confirm the Prompt API shows "Detected and ready".
Troubleshooting: If the model shows "downloadable" but never downloads, confirm your device meets the hardware requirements above, restart Chrome, then revisit
chrome://on-device-internals. You can also run
await LanguageModel.availability() in the DevTools console — it should return
"available". See
full docs.
Edge: enable built-in AI
Edge shares Chromium's built-in AI APIs alongside its own Copilot features.
- Update Edge to the latest version (138+ recommended). For early access, install Edge Dev or Canary.
- Navigate to edge://flags/#optimization-guide-on-device-model and set it to Enabled.
- Navigate to edge://flags/#prompt-api-for-gemini-nano and set it to Enabled.
- Click Restart at the bottom of the flags page.
- After restart, open edge://on-device-internals and check the Model Status tab. Wait for the model download to complete.
- Open the demo page, click Run Built-in Tests, and confirm the Prompt API shows "Detected and ready".
Note: Edge also includes Copilot, which is a cloud-based AI assistant. Copilot features work independently of the on-device model flags above. The built-in AI APIs tested by this demo are the on-device Chromium APIs, not Copilot.
Firefox: AI controls
Firefox takes a different approach — AI features emphasize user control and privacy.
- Install Firefox Beta or Nightly for newest features.
- Open about:support to verify your channel and build version.
- Open Firefox Settings → Firefox Labs and review available AI experiments.
- Enable any available AI chatbot integrations or sidebar features.
- Open the demo page, click Run Built-in Tests to see which APIs are detected.
Firefox does not currently expose the same on-device AI APIs as Chrome/Edge (Prompt API, Summarizer, etc.). The built-in test panel will show "Not detected" for most APIs. Firefox AI features are currently focused on sidebar/chatbot integrations rather than on-device inference APIs.
Safari: current status
Safari and WebKit do not yet expose built-in AI APIs.
Apple has not announced plans for on-device AI APIs in Safari comparable to Chrome's Prompt API. Apple Intelligence features are integrated at the OS level rather than through browser JavaScript APIs.
The built-in test panel will show "Not detected" for all AI APIs in Safari. This is expected. Apple may introduce Safari-specific AI APIs in the future.