Related Product ID [related_product_id] Field for Product Feed

Recommended for Enhancing Cross-Selling and Product Discovery in ChatGPT

The related_product_id attribute defines a list of product identifiers that are associated with or complement the current product.
It helps ChatGPT surface product suggestions such as compatible accessories, similar styles, or upgrade options directly in conversational results.

When to use

Use this field to connect related products in your catalog.
It allows ChatGPT to better understand your product relationships and improves cross-selling opportunities.

• [related_product_id] can be used to link:

  • Accessories or compatible parts (e.g., “phone case”, “charger”)
  • Alternative colors, sizes, or materials
  • Complementary items frequently purchased together
  • Products that belong to the same collection or bundle

• [related_product_id] should:

  • Contain valid product IDs or SKUs that already exist in your feed.
  • Use a comma-separated list if multiple IDs are provided.
  • Avoid references to unavailable or deleted products.

Format

• Type: String
• Allowed values: One or more valid product IDs
• Delimiter: Comma (,) for multiple entries
• Repeated field: No (use list format instead)
• Schema.org property: Product.isRelatedTo

Examples:

Best practices

Note: Linking relevant products enhances recommendations and upselling performance in ChatGPT.

• Include IDs for related, available products in your feed.
• Maintain accurate SKU relationships (e.g., within the same brand).
• Keep lists short (under 10 related IDs per product).
• Don’t reference products not present in your feed.
• Don’t include descriptive text or extra formatting.

SEO / AI Tip

Adding related_product_id helps ChatGPT display contextually relevant recommendations and improves catalog navigation.
It can also boost average order value (AOV) by connecting products frequently purchased together or part of the same series.

Official Source: ChatGPT Product Feed Specs