Startup
Beam
Sandboxes, persistent VMs and serverless GPUs for AI agents
Beam is a cloud platform for agents that offers persistent VMs, isolated sandboxes, inference endpoints and serverless GPUs. Sandboxes boot in seconds to run untrusted, agent-generated code, use custom images, and can fan out from one saved snapshot, for example for RL rollouts. The open-source runtime is beta9, and the site says the company is backed by Y Combinator.
Neighbours in the directory
Prague, Czechia · Est. 2023
Open-source sandboxes for running AI-generated code.
E2B gives agents secure, isolated cloud micro-VMs to execute code and commands — the execution runtime layer of the harness, used by many coding and data-analysis agents.
Est. 2023
Elastic sandboxes for running AI-generated code.
Daytona provides secure, OCI-compatible sandbox 'computers' that spin up in under 90ms — with snapshots for persistent agent state. In 2026 it moved core development to a private codebase while continuing to run as a commercial platform.
New York, NY · Est. 2021
Serverless cloud built for AI and agentic compute.
Modal lets teams run inference, fine-tuning and arbitrary agent workloads as serverless Python without managing infrastructure — a common substrate for harness backends at scale.
Sources
Verified Oct 29, 2026