Stitch Fix uses a fine-tuned version of OpenAI's GPT-3 to automatically generate product description text for the thousands of clothing items in its inventory. Human copywriters and merchandisers review the AI-generated descriptions before publication.

Stitch Fix trained GPT-3 on several hundred product descriptions written by expert copywriters, along with product attributes and client feedback notes, enabling it to generate brand-voice-consistent descriptions at scale. The system can generate 10,000 product descriptions in 30 minutes, with each requiring less than a minute of human review. The need arose when Stitch Fix launched Freestyle, its on-demand shopping feature, which required detailed product pages for search engine visibility and client decision-making. Human copywriters and merchandise experts serve as a final quality gate in an 'expert-in-the-loop' approach.