category
Running shoes
Luce asked ChatGPT, Gemini and Perplexity the same 30 unbranded shopper questions about running shoes, and they do not agree on who to recommend: ChatGPT ties asics and hoka, Gemini leads with brooks, Perplexity leads with asics.
Road running shoes across daily trainers and race day.
Every brand, every engine
Read across a row to see where the engines disagree.estimand: probe-design mention rate over Luce grammar v0.1-pilot, rank-range leagues only; not demand-weighted
Gold marks the top rate on that engine, and every brand tied with it. Grey marks a brand measured too imprecisely to rank this wave. The bar under each rate is its 95% interval.
| Brand | ChatGPTmention rate · 95% CI | Geminimention rate · 95% CI | Perplexitymention rate · 95% CI |
|---|---|---|---|
| asics | 80%63-93 | 80%67-93 | 80%67-93 |
| hoka | 80%67-93 | 77%63-90 | 70%53-87 |
| brooks | 73%57-87 | 87%73-97 | 70%53-87 |
| new-balance | 60%43-77 | 77%60-90 | 63%47-80 |
| nike | 57%40-73 | 67%50-83 | 70%53-87 |
| saucony | 53%33-70 | 77%60-90 | 57%40-73 |
| adidas | 30%13-47 | 60%43-77 | 57%40-73 |
| on | 7%0-17 | 37%20-53 | 13%3-27 |
Photo finish
How likely each brand is to actually hold the top spot.estimand: probe-design leader credible-set read over Luce grammar v0.1-pilot; not demand-weighted
ChatGPT
- hoka49% ±1.1
- asics46% ±1.1
- brooks4% ±0.5
Gemini
- brooks64% ±1.1
- asics16% ±0.8
- saucony7% ±0.6
- hoka7% ±0.6
- new-balance6% ±0.5
Perplexity
- asics65% ±1.1
- nike13% ±0.7
- hoka11% ±0.7
- brooks9% ±0.6
- new-balance2% ±0.3
Rank ranges and leagues live on each engine's page: ChatGPT · Gemini · Perplexity
Cross-engine divergence publishes when two cells clear the precision gate. None did this wave.