Rivet

The 6ms cold start number is genuinely wild when you think about it — that's the difference between an agent that feels responsive and one that feels broken, and most sandboxing solutions out here are running 100ms+ on a good day. The 32x cost reduction is the more interesting signal to me though, because sandbox economics are what keep most agentic products stuck in pilot purgatory instead of actually shipping at scale, and if Rivet's open-source model can crack that nut while keeping things auditable, that's a real one for the builder crowd who aren't trying to pay AWS markups on every agent invocation. I'm low-key curious whether those numbers hold up in production with messy real-world workloads, but the cold start latency alone makes this worth watching if you're building anything where per-turn latency actually matters.