Aaron Glazer
@aaronglazer
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@Shopify. prev: Founder and CEO @Taplytics + @DevCycle (YC W14).
Joined May 2009
The greatest constraint on exercising RL at scale on real world problems is the lack of data on end goals. Also, the lack of variation (experiments) in the data. @Shopify has both in spades and their Winter Edition 2026 release takes full advantage of this on behalf of their
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Horrible news out of Australia this Hanukkah. Darkness trying to steal a moment meant for light. As Jews, we do what we’ve always done. We light the candles anyway. Hanukkah isn’t about ignoring the dark. It’s about defying it. One flame. Then another. More light than hate.
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Finally had time to test GPT-5.2 Pro. On my tasks Extended Thinking is a VERY significant improvement over 5.1 Pro - feels roughly on the order of o1 Pro -> o3 Pro jump.
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wow this is cool. synthetic shoppers and synthetic customer segments of all kind are coming.
This is absolutely one of the craziest things that we have ever shipped. You can use rollouts to A/B test your new idea and wait some weeks for results… or just use SimGym to simulate your customer and get results right now
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You wanted drafts … we gave you drafts, and scheduled launches, and gradual rollouts, and A/B testing on those rollouts, and simulated agentic browsers to estimate impacts before they go live. The team over delivered on this!
Join us live at 9:30am EST
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All three are massive updates on their own. The team has been cooking!
OK, I lied. There are 3 really cool things (if I say so myself): - SimGym - Sidekick Pulse - Product Network As I said, I don't believe anyone has those in production in scale - except for Shopify.
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Shopify's new SimGym is AI applied right: Being able to get statistically significant A/B tests done quick without the volume of a huge store is crazy.
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This is absolutely one of the craziest things that we have ever shipped. You can use rollouts to A/B test your new idea and wait some weeks for results… or just use SimGym to simulate your customer and get results right now
Today we started rolling out SimGym — a system that creates “digital customers” that behave like real ones. They browse your site, complete tasks, and reveal optimization opportunities. You can even run A/B tests with *zero* live traffic! Spent a year developing it.
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It's exciting to see Rollouts become a native Shopify feature. A core primitive for scheduling and testing all things now on Shopify. One more reason to leverage Markets over multi-shop setups. Also @aaronglazer's work on SimGym is mind blowing. Synthetic buyers shopping is
Shopify Winter ’26 Edition (RenAIssance) just dropped and this one's HUGE. 🚀 - Rollouts: Native theme scheduling and A/B testing in admin. - SimGym: Simulated AI shoppers browsing theme changes to give you signals on what's working! Test ideas before betting the farm.
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Today we started rolling out SimGym — a system that creates “digital customers” that behave like real ones. They browse your site, complete tasks, and reveal optimization opportunities. You can even run A/B tests with *zero* live traffic! Spent a year developing it.
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Pulse is such a cool feature. Get answers to questions that you didn’t even know you should ask!
Sidekick Pulse was such a fun feature to build. I've been building assistants for 15 years across many eras of machine learning. Most have been reactive or user-initiated. I've dabbled a few times over the years to build a proactive assistant, but it always ended up
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SimGym is like a crystal ball for your ideas!
This is absolutely one of the craziest things that we have ever shipped. You can use rollouts to A/B test your new idea and wait some weeks for results… or just use SimGym to simulate your customer and get results right now
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Shopify Winter ’26 Edition (RenAIssance) just dropped and this one's HUGE. 🚀 - Rollouts: Native theme scheduling and A/B testing in admin. - SimGym: Simulated AI shoppers browsing theme changes to give you signals on what's working! Test ideas before betting the farm.
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SimGym is such an incredible application of AI. Be bold without risk. We can’t wait to see what you simulate!
Today we started rolling out SimGym — a system that creates “digital customers” that behave like real ones. They browse your site, complete tasks, and reveal optimization opportunities. You can even run A/B tests with *zero* live traffic! Spent a year developing it.
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We're living in a renaissance of entrepreneurship. AI is rewriting what's possible at lightning speed. Introducing The RenAIssance Edition. I think you'll like it.
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SimGym is such an incredible superpower. It lets you be bold and try new ideas without risk! 🚀 🚀 🚀
Shopify's new SimGym is AI applied right: Being able to get statistically significant A/B tests done quick without the volume of a huge store is crazy.
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It's a HUGE day at @Shopify. Say hello to the RenAIssance Edition. Tobi's 🧵 shares so much goodness. 👀👀👀
Shopify: The RenAIssance Edition Sidekick updates, Agentic Storefronts for merchants, new tools for devs building commerce agents, AI simulations, and more 🧵
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