# Rivet launches an open-source actor orchestrator for agents built on S3

> Original title: Launch HN: Rivet (YC W23) – Scale and Orchestrate Agents on S3

- Source: Hacker News · Launch HN, YC launches (10+ points)
- Published: 2026-11-05T17:17:42.000Z
- Bad Influence: https://badinfluence.news/items/blgq8bl2doo4arqmh8tbgvnmq
- Original: https://github.com/rivet-dev/rivet

## Summary

Rivet, a Y Combinator W23 startup, launches an open-source orchestrator for agentic workloads built on the actor model. The company says each Rivet Actor uses 72 KB of RAM and cold-starts in 4.99 ms at p99, compared with 512 MiB and 1.70 s for a sandbox, and that its SQLite storage on S3 is 10.4× cheaper than replicated SSDs.

## Why it matters

The source gives concrete cold-start, memory, and storage figures with a methodology link, helping readers compare actor-based agent orchestration against sandbox approaches.