[VELIU· LUCE](https://luce.veliu.com/index.html)

how AI engines recommend brands

 PILOT · W30  Search / (Search brands, categories and engines)

Board ▾

Board [Overview](https://luce.veliu.com/index.html) [Running shoes](https://luce.veliu.com/c/running-shoes.html) [Wireless earbuds](https://luce.veliu.com/c/wireless-earbuds.html)

[Coffee machines](https://luce.veliu.com/answers.html#coffee-machines) measuring

[Robot vacuums](https://luce.veliu.com/answers.html#robot-vacuums) measuring

[Air fryers](https://luce.veliu.com/answers.html#air-fryers) measuring

[All brands](https://luce.veliu.com/brands.html) [Real answers](https://luce.veliu.com/answers.html)

Engines [ChatGPT](https://luce.veliu.com/e/chatgpt-web.html) [ChatGPT API](https://luce.veliu.com/e/chatgpt-api.html) [Gemini](https://luce.veliu.com/e/gemini.html) [Perplexity](https://luce.veliu.com/e/perplexity.html)

Research [Coverage](https://luce.veliu.com/coverage.html) [Methodology](https://luce.veliu.com/methodology.html) [Sources](https://luce.veliu.com/sources.html) [Glossary](https://luce.veliu.com/glossary.html) [Tools](https://luce.veliu.com/tools) (primary)

en-US ·  grammar luce-live-v0  Dark  (Current theme: dark) (wave luce-live-w30 · grammar luce-live-v0 · generated 2026-07-15 19:49:02 UTC)

**PILOT · W30** real engine answers · small pilot wave · wide intervals by design Synthetic probes · not real user sessions · this wave 100% [L3](https://luce.veliu.com/glossary.html#provenance-tier)  · answers [L1](https://luce.veliu.com/glossary.html#provenance-tier)  elicited

All categories▾

[All categories](https://luce.veliu.com/index.html) [Running shoes](https://luce.veliu.com/c/running-shoes.html) [Wireless earbuds](https://luce.veliu.com/c/wireless-earbuds.html)

·

All engines▾

[All engines](https://luce.veliu.com/index.html) [ChatGPT](https://luce.veliu.com/e/chatgpt-web.html) [ChatGPT API](https://luce.veliu.com/e/chatgpt-api.html) [Gemini](https://luce.veliu.com/e/gemini.html) [Perplexity](https://luce.veliu.com/e/perplexity.html)

· en-US · LUCE-LIVE-W30 · measured from 15 Jul 2026 · 60 days ago (what you are viewing)

engine

# ChatGPT

Luce measures ChatGPT as two separate surfaces. The web app is what a shopper sees when they ask, and the API is what a developer calls. They answer differently, so each keeps its own board and the two are never merged into one figure. Open the surface you mean.

01

## Two surfaces, two boards

Each surface is measured on its own and published on its own.

[ChatGPT web app The live web app, captured as a shopper sees it, with the products the answer put forward. Open the board ›](https://luce.veliu.com/e/chatgpt-web.html) [ChatGPT API The developer API, called with the same prompt grammar and read as its own board. Open the board ›](https://luce.veliu.com/e/chatgpt-api.html)

Published by Veliu Research Lab. Veliu sells services to brands measured here.

Live pilot wave luce-live-w30. The method, the probe log and this wave's coverage are on the methodology page.