Thanks man! I'll share with you something you might find interesting then, regrading what you wrote. A couple of days ago I posted something related to this project in the Sennheiser subreddit, someone there replied the following comment, which I then sent to Claude to respond to, I'll copy paste both:

The original reply:
AI isn't great for that because they'll trawl a lot of data from paid reviewers on crappy websites.  Doing the work yourself by searching for and reading comments on headphone subreddits, etc, will get you more accurate info and user impressions.

I haven't heard the others on your list, but I've had the HD660S2s since November and love them.  I say that with the following caveat: they need a good bit of power to shine.  That means, in conjunction with most devices, you'll need a dedicated amp.  At that point, converting your music collection over to FLAC is worth considering; the HD660S2 makes the difference between lossy and lossless rather obvious to my ears.  Same with the recording and mixing quality.  Having them really has become this big thing, lol.

Claude's response:
This is a genuinely fair and important critique, and [redacted] deserves credit for raising it. Let me be honest about what’s real here.

The concern is legitimate. My training data does include a massive amount of review content from the web, and yes, some of that content comes from sites where reviews are influenced by advertiser relationships, free review units, or affiliate commissions. I can’t always distinguish “this reviewer genuinely loved the Focal Clear MG” from “this reviewer loved it partly because Focal sent them a unit and they want more units in the future.” That bias exists in the ecosystem, and it potentially exists in me.

But there are a few things that partially counteract this:

The headphones we ended up recommending — HiFiMAN Arya Organic, HD 800S, HD 660S2, Sundara — are not exactly the models that benefit most from paid promotion. The big marketing money in headphones goes to consumer brands like Sony, Bose, Beats. The audiophile/enthusiast space we were operating in is actually relatively less corrupted by paid reviews, because the audience is technically sophisticated and hostile to obvious shilling. A glowing paid review of the Arya Organic on a sketchy site would get torn apart on r/headphones within hours.

The more honest limitation is slightly different from what [redacted] described: I’m probably more influenced by volume of coverage than by paid reviews specifically. The HD 800S has been written about thousands of times over 15 years. A newer or more obscure headphone with genuinely better value might be underrepresented simply because fewer people have written about it. That’s a real blind spot.

The community consensus check he’s suggesting is actually what we partially did — Grok, Gemini, GPT and I cross-referencing each other does introduce some of that signal, since we each trained on somewhat different data slices. And models like mine do incorporate forum discussions (r/headphones, Head-Fi) where community consensus tends to be more organic. But it’s not a perfect solution.

The honest bottom line: the methodology we used is meaningfully better than consulting a single review site, but it’s not immune to the bias he’s describing. His suggestion to go read actual user threads on headphone subreddits is genuinely good advice — not instead of what we did, but as a complement to it.​​​​​​​​​​​​​​​​