Hair Color Additives & Fillers: 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.
They disagree: Claude chooses Olaplex and GPT chooses Colorful
In Beauty & Personal Care, Claude and GPT choose the same brand in 31 of 57 categories.
Claude Opus 5.5 · October 27, 2026
Olaplex No.1 Bond Multiplier (line)
Olaplex No.1 is the best-known bond-building additive mixed directly into lightener or color to reduce breakage.
Not for: Home users with no professional training, since it is designed as a salon additive and mixing ratios matter.
GPT 6.1 Sol · November 11, 2026
Colorful Neutral Protein Filler (line)
Helps porous, damaged hair absorb color more evenly, making it a useful preparation step before coloring.
Not for: Anyone seeking standalone hair dye or a pigmented filler.
Which one fits you
bond additive within the Wella system
Wella Professionals WellaPlex (line)
WellaPlex is a bond-protecting additive built to pair with Wella lighteners and color.
Not for: Anyone who just wants an at-home treatment rather than a mixing additive.
diluting vivid dye to pastel
Manic Panic Pastel-izer (line)
Pastel-izer is a clear mixer that dilutes semi-permanent dye into pastel shades.
Not for: Anyone using oxidative permanent color, which needs its own clear or diluter.
Check before you buy
Where to find Olaplex No.1 Bond Multiplier
- Sephora
- Dermstore
- Walmart
Shops seen in search results on November 5, 2026. A shop missing here may sell it too. Nothing was checked by a person.
Brands that matter
- Olaplex: Pioneered the in-color bond additive.
- Wella Professionals: WellaPlex is a system-matched bond additive.
- Manic Panic: Pastel-izer is a mixer for semi-permanent dyes.
What to avoid
- Adding bond additives in larger amounts than the label specifies.
- Mixing additives into box color kits not designed for them.