I was trying to use the AI Benchmarking tool at https://www.devicetest.ai and I can't seem to get it to work. I downloaded the Opera Developer version, then I navigate to the URL, but I don't get any message about downloading local models or anything of the sort, it just says To get started, download the latest version of Opera Developer on the page.

I went through all the settings and have no ad blocking on, I switched to Cloudflare DNS, but the page never changed. I searched around and read some articles on what's meant to show up and happen but I'm not seeing that. What am I doing wrong?

Opera One (version: 134.0.5952.0)
Update stream: developer
System:Windows 11 64-bit
Chromium version:150.0.7846.4

OS:
Windows 11 Pro 25H2
OS Build: 26200.8655
Experience: Windows Feature Experience Pack 1000.26100.315.0

That's a pretty interesting edge case. I ran into a similar issue last week while testing some web-based LLMs locally.

Most of the time, these benchmarking sites rely on a very strict script to check the browser's User-Agent or specific flags. Since you're running the Developer stream of Opera, the detection script might fail to map your Chromium version properly, making the site think you are on an unsuported browser.

In my daily work doing web architechture audits and troubleshooting server logs, I see this kind of false positive all the time with dev builds.

Before messing with your system settings again, have you tried manually overriding your User-Agent via the DevTools (F12 -> Network conditions) to mimic a standard stable Chrome or Opera One build? It could help pinpoint if the issue is just a rigid detection script or a real permission block with local models on your build. Let us know if that bypasses the prompt!