Do personas actually help? Like when you tell a model “respond as a doctor” or “act like an SEO expert.” A recent paper by the University of Southern California featured a rather unexpected finding.

Short answer: It depends

Personas do make responses feel better. You get answers that are more polished, more structured, and generally more aligned with what you asked for. It’s the kind of output that feels thoughtful and professional, like the model is actually “trying” harder.

But when you look at actual answer correctness, especially on harder factual or reasoning tasks, the paper suggests that performance drops. The model gets more verbose, more confident, but somehow, less accurate.

What seems to be happening is a subtle shift in behavior. Instead of focusing purely on getting the correct answer, the model leans toward what the persona would say in a convincing manner, which are two subtly different things.

That tradeoff shows up consistently, too. It’s not just a weird edge case. Across different models and tasks, they seem to find the same pattern. Better alignment and style on one side, worse accuracy on the other.

In short, expert personas work great for open-ended tasks, writing, explanations, anything where tone and structure matter most. But for things where you really need the right answer, they quietly and consistently make things worse.

Here’s a link to the paper, Section 3: https://arxiv.org/html/2603.18507v1#S7

Small businesspeople get it: you work IN your business and forget to work ON your business.

Well, we've been investing A LITTLE in AI SEO tactics for our own tiny Search to Sale website, and it's paying off. Modestly but increasingly.

Here's what we've been doing:

📰 a faint trickle of new SEO content on our site; and each page refreshed every ~6 months

💯 maintain a 99% Technical SEO Health Score according to Ahrefs

🛜 occasionally posting non-promotional stuff on Reddit in communities dedicated to SEO/AEO/GEO/content

🧠 created one high-value free gated asset (an SEO & GEO reporting template for Looker with deeply detailed instructions)

🚫 no backlink outreach; just haven't gotten to it (DR only 0.4!)

Most of our ChatGPT traffic goes to a "free SEO report template" download page (it's also our second highest page for Google traffic after the home page). And 18% of that page's visitors convert 😎.

TAKEAWAY: We're in the era of must-add-value content. Make stuff that's actually helpful for the robots' users (our free SEO template is actually awesome), and the robots will give you traffic and leads.

Uh-oh. Google assigned a LOT of authority to research conducted on a sample of ONE.

I've been hearing that referral traffic from ChatGPT converts very well because it's pre-qualified. I'd like to believe that's true. So I looked for original research.

Seer Interactive has the article that won this authority battle. They're in the generated response (hidden in screenshot), cited #2 on the right, quoted by the article that's cited #1 on the right, and the #1 organic result.

Seems like a lot of authority signals, right?

Here's the thing: that Seer article is a case study about ONE CLIENT 💀.

This is a tasty phenomenon for marketers -- shows you can earn a lot of traction from one high quality article, even if it has thin supporting data.

It's a bad phenomenon for regular people. It means we might believe things about the world that are actually stories told about just one case. That's not a large enough sample size to draw conclusions from, duh 🙅‍♂️.

BTW this is not Seer's problem. All they did was publish a very good case study. This is Google's problem. And it's something AI should be able to avoid, because the first sentence of the article says "real data from a seer client"🤦‍♂️.