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The Prompt API is now on by default in Chrome

adsm.dev
4 points·by scriptsmith·2 เดือนที่ผ่านมา·2 comments

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scriptsmith
·9 วันที่ผ่านมา·discuss
Is GitHub Copilot the best positioned platform for enterprise? They support Claude, GPT, Gemini, and now even open weight models. Larger orgs are paying at API rates anyway so it costs just as much as anywhere else. They have a pretty good agent CLI and SDK, and now a desktop app. They have hosted agents, and you can run their 'Agentic Workflows' in CI.

Has their reputation tanked so much that the alternatives get all the buzz? Or is it that non-enterprise users are priced out by the usage costs, so no free marketing?
scriptsmith
·10 วันที่ผ่านมา·discuss
Definitely took longer than I was expecting, then after two weeks I thought we'd never get it.
scriptsmith
·28 วันที่ผ่านมา·discuss
And now is this going to be a one-off, or routine with every new generation of models?
scriptsmith
·2 เดือนที่ผ่านมา·discuss
It's based on a Gemma 3n model, and yeah it's not the best. But if you have a use case that needs constrained JSON output for example, it's pretty neat.

Maybe it would do better with the new Gemma 4 models, which the Chrome devs have been hinting at moving to. And why the API doesn't let you introspect / pick the model, I'm still not sure.
scriptsmith
·2 เดือนที่ผ่านมา·discuss
I've got some demos of what the new Prompt API in Chrome that uses a local model can do: https://adsm.dev/posts/prompt-api/#what-could-you-build-with...

As OP says, it shines in constrained environments where the model is transforming user-owned data. Definitely less useful for anything more open-ended.
scriptsmith
·2 เดือนที่ผ่านมา·discuss
Chromium mostly does not support this, because it doesn't have the binary blob required to run the inference. However, it does still download the model weights and expose the LanguageModel API, because that part is hooked up.

https://adsm.dev/posts/prompt-api/#which-browsers-support-th...

Packagers might eventually disable that but I tested this behaviour in chromium 148 a few hours ago, and it would download the weights but has trouble running them.
scriptsmith
·2 เดือนที่ผ่านมา·discuss
> My understanding is that you’ll have to explicitly agree to download alternate models in the future, per the specification

I don't get that from the spec. Closest thing I could find in the Writing and Assistance APIs spec [1] (which the Prompt API refers to) says:

> [It] allows the user agent to prompt the user for permission

But that's talking more about initiating the 'download' process more than choosing the model.

I think Chrome wants the browser to be 'opinionated' about the model used however, rather than letting the webpage pick, at least for now.

[1] https://webmachinelearning.github.io/writing-assistance-apis...
scriptsmith
·2 เดือนที่ผ่านมา·discuss
Depends on where you get it. By default the flags will be enabled, but some packagers may choose to disable them. I haven't seen a major distro release chromium 148 yet.

Weirdly though, chromium won't be able to actually use the model even though it can download it, because the inference engine is a closed-source blob.

https://adsm.dev/posts/prompt-api/#which-browsers-support-th...
scriptsmith
·2 เดือนที่ผ่านมา·discuss
I wrote a more detailed blog post here:

https://news.ycombinator.com/item?id=48028662
scriptsmith
·2 เดือนที่ผ่านมา·discuss
Chromium doesn't support this API because it needs a binary blob to run the inference, although in theory it may still be configured to download the weights:

https://adsm.dev/posts/prompt-api/#which-browsers-support-th...
scriptsmith
·2 เดือนที่ผ่านมา·discuss
It can only be called after the user has interacted with the page, but there's no dialogue from the browser

https://developer.chrome.com/docs/ai/get-started#user-activa...
scriptsmith
·2 เดือนที่ผ่านมา·discuss
Author here. After trying out the Prompt API over the last week, I wrote up some details on the chromium internals, how to use the API, and made some toy demos.

It's a 4 GB model that can be used to run on-device inference.
scriptsmith
·2 เดือนที่ผ่านมา·discuss
In my understanding, yes. I wrote a blog post about some of the internals here: https://news.ycombinator.com/item?id=48028662
scriptsmith
·2 เดือนที่ผ่านมา·discuss
Google has been trialling the Prompt API in chrome for the over a year, so before Gemma 4 existed. But they are indicating they'll move to Gemma 4: https://groups.google.com/a/chromium.org/g/blink-dev/c/iR6R7...
scriptsmith
·2 เดือนที่ผ่านมา·discuss
It's based on Gemma 3n, and it's not the best.

I find it works fine for simple classification, translation, interpretation of images & audio. It can write longer prose, but it's pretty bad.

It can also write text in the format of a JSON schema or regexp for anything you might want to do with structured data.
scriptsmith
·2 เดือนที่ผ่านมา·discuss
Those flags will exist already, but will default to enabled in 148.

That other flag is for using a different open-source inference engine to the (from what I can tell) closed-source one that's used by default.
scriptsmith
·2 เดือนที่ผ่านมา·discuss
If Chrome has the #optimization-guide-on-device-model and #prompt-api-for-gemini-nano flags enabled, either because it's part of some Origin Trial / Early Stable Release or something, then web pages will have access to the new Prompt API which allows any webpage to initiate the (one-time) download of the ~2.7 GiB CPU or ~4.0 GiB GPU model using LanguageModel.create()

https://developer.chrome.com/docs/ai/prompt-api

When Chrome 148 releases tomorrow, this will be the default behaviour on desktop.

To download, it should check for 22 GiB free disk space on the volume where your Chrome data dir is, and at least double the model size of free space in your tmp dir.
scriptsmith
·4 เดือนที่ผ่านมา·discuss
Yes, you could turn it around to say that using Anthropic models in Cursor, Copilot, Junie, etc. is 'subsidising' Claude Code users.
scriptsmith
·4 เดือนที่ผ่านมา·discuss
The "First-class syntactic selection" reminds me of my most used shortcut(s) in Jetbrains IDEs: the Expand / Shrink Selection.

  Ctrl + W
  Ctrl + Shift + W
https://www.jetbrains.com/help/idea/working-with-source-code...

It really changed my perspective on interacting with the 'text' of a file.

VS Code, Zed, etc. have similar operations, but in my experience they expand and shrink too coarsely.
scriptsmith
·7 ปีที่แล้ว·discuss
> Does this hurt FOSS contributions, because now people start to expect to be paid rather than doing it for inherent motivations? Will this generate toxic politics among project contributors regarding who gets credit + gets paid?

I'd also be concerned about features being implemented because there's money behind it, forgoing more important technical reasons.

Of course there are many projects that already implement this 'quid pro quo' development strategy, and open source projects with big corporate backers. How do these projects currently handle monetary influence in their decision making?