Suggest the state of a camera to be taken from six photos

What was done

According to Back Market's engineering blog (28 Jan. 2026), the service for the recovery of used devices was blocked by a lack of appreciation: the seller often finds his phone in better condition than the reconditioning teams will do, hence counter-offers that undermine confidence. With AI Grading, the user takes six photos (face, back, sides, top, bottom), answers some operational questions, and the model offers a note based on visible damage; The user always keeps the last word. The team compared GPT-4o and Gemini Flash 2.5 and retained the second, of comparable accuracy at a cost eight times lower according to the article. The prompt asked for weeks of iterations: to ignore dust and reflections, to prefer "impossible to evaluate" to a forced note, to repeat the internal definitions of quality. A switch allows you to change your model without redeployment. In seven weeks of production, approximately 78% of users accepted the suggestion. The counter-offers rate did not change (about 21%), but their acceptance rate rose from 64% to 68%.

Before you start

Tool cited by the source: Gemini; other tools cited: GPT-4o. Gather the information the prompt asks for. Strip confidential data that is not needed and check your tool’s access terms. Features and plans can change.

The method, in three steps.

1. 01

   Gather the context

   Gather the information described in the prompt.

2. 02

   Adapt the prompt

   Copy the prompt below, replace the bracketed items, then paste it into Gemini.

3. 03

   Reread before using

   Reread the result, correct it if needed and keep the final decision. Caveats are detailed below.

Your starting point.

Replace the bracketed items, then adapt the proposal to your situation. This prompt is written by the iadujour desk It is not a quotation from the source.

Here are
Here is the status grid used by the buyer:

For the screen and the shell, proposes a level of the grid by quoting the visible defect that justifies it. Ignore dust, traces and reflections. If a photo is highlighted or missing, answer "impossible to evaluate" for the area concerned other thanguess.

What deserves your attention