Simgym

Shopify's SimGym sends simulated shoppers through a merchant's storefront, and a language model decides each shopper's next action, so every wait for the model adds to the bill. Shopify's February 2026 engineering post says each simulated shopper has a persona, a budget and a shopping intent and runs in a cloud browser from Browserbase, which bills per minute, while Shopify's own inference cluster runs the model. The loop is sequential: the browser sends the page state, the model returns an action, the browser executes it, and this repeats about 10 to 13 times. Shopify says that a roughly 20% cut in average model latency reduced cost per merchant run by about 10% and raised daily throughput by about 12%. These are measurements of the simulation system. The post does not claim that the simulated results match real shoppers' purchasing.