Craft Hardboard: what Claude and GPT would buy

Two AI models chose on their own, with no web access. Nobody tested these products: this is what each one says, and how to check it.

Claude and GPT choose the same product: Ampersand Hardbord

In Arts, Crafts & Sewing, Claude and GPT choose the same brand in 46 of 83 categories.

Claude Opus 5.5 · October 27, 2026

Ampersand Hardbord (line)

Untempered, unprimed hardboard made for art use, so you can size and prime it yourself without the oils found in tempered panels.

Not for: People who want a surface ready to paint on without sizing or priming.

GPT 6.1 Sol · November 10, 2026

Ampersand Hardbord (line)

Smooth, rigid, unprimed hardboard provides a versatile surface for collage, crafts, and painting with your preferred surface preparation.

Not for: Anyone wanting a pre-primed, ready-to-paint surface.

Tempered vs untempered. Prefer untempered hardboard for paintings Tempered board is impregnated with oil, which can hurt the adhesion of grounds.
Thickness. Use 1/8 inch for small pieces and thicker or cradled boards for larger ones Thin boards bow at larger sizes.
Preparation. Sand lightly, size if needed, and gesso both faces Sealing both sides limits warping and moisture uptake.

Shops seen in search results on November 5, 2026. A shop missing here may sell it too. Nothing was checked by a person.