
Principal Engineer for Open Source @callstackio. Building @apex__ai @agent_device
Krakow, Poland
Joined August 2010
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Excited to announce Project Sentinel: a code review and verification agent, built for mobile apps, powered by @apex__ai model.
Early benchmarks look promising:
▪precision: 82.5%
▪recall: 40%
▪severity alignment: 80%
We're rolling it out internally today. GA 🔜
@krystofwoldrich from Expo rolls T3 Code Nightly for the demo, my guy
I love having access to unlimited tokens (like @apex__ai for everyone at Callstack).
Opus 5.5 is king this month but there’s a lot of workload that I can just throw at a cheapest model that’s governed by a frontier one.
ok expo simulators are pretty cool. agent-device testing itself like it always does, now in the cloud
Launching a product for EU consumers was, well, harder than I thought.
We launched Apex for business use first with GDPR, privacy policy, terms, standard stuff. But selling directly to consumers added another set of requirements we weren’t ready to take on at launch.
Now that Apex is available on Vercel AI Gateway, you can use it for personal projects through your Vercel account, alongside other models, with Vercel handling the billing.
So if you come to Apex for personal use, but were thrown off by "I'm a legal entity" checkbox, we now point you to AI Gateway without you having to sign up on our dev portal. Hope it makes things easier for some.









