LLM Sandbox alternatives
The 5 alternatives below are grouped by kind of sandbox, and each says what it does differently from LLM Sandbox. Start from whatever made you look: missing GPUs, session limits, self-hosting, pricing or isolation.
Why teams look beyond LLM Sandbox
A convenient backend-agnostic wrapper for teams that already run containers and want a Python-first code-execution layer.
- Isolation is only as strong as the container runtime; local Linux backends share the host kernel
- Security policies do not block execution on their own
- No documented startup figures, GPU support or hosted option
LLM Sandbox alternatives, by kind
Code execution APIs
Submit code, get output: online judges, compiler APIs and Jupyter kernels as a service.
Judge0
Open-source online code execution system (GPL-3.0) that runs each submission in an isolate sandbox, offered as Judge0 Cloud via RapidAPI or directly and as a self-hosted Docker Compose stack.
- isolate (namespaces/cgroups)
- Open source
- Self-hostable
How it differs: Batch "submit code, get stdout" judging in 60-90+ languages with per-submission CPU, wall-clock and memory limits. The reference open-source online judge: ideal for stateless, time-boxed code evaluation at scale, but not a workspace an agent can return to.
Open-source runtimes to self-host
Open-source sandbox runtimes you run on your own servers or Kubernetes.
OpenHands Runtime
The sandbox layer of the OpenHands agent SDK: an agent server that runs in a Docker container, in-process locally, or on the hosted OpenHands Runtime API.
- Docker container
- Open source
- Self-hostable
How it differs: Running OpenHands agents in disposable Docker sandboxes, locally or in CI, with the same server reachable through a hosted runtime for large evaluations. The right sandbox layer if you are already building on the OpenHands SDK; elsewhere a general container or microVM sandbox is simpler.
SWE-ReX
Runtime interface from the SWE-agent team for running agent shell sessions locally or in Docker, Modal and AWS Fargate sandboxes, built for massively parallel runs.
- Docker / Modal / Fargate
- Open source
- Self-hostable
How it differs: Running many SWE-agent-style shell sessions in parallel across local, Docker, Modal or Fargate backends. A thin, backend-agnostic shell runtime that is most useful when the goal is parallel coding-agent evaluation rather than a hosted sandbox.
Isolation primitives and runtimes
The hypervisors, user-space kernels, OS sandboxes and WebAssembly runtimes that sandbox platforms build on.
bubblewrap
The unprivileged Linux namespace sandboxer behind Flatpak and Anthropic's sandbox runtime; you assemble the policy from command-line flags.
- Linux namespaces
- Open source
- Self-hostable
How it differs: Lightweight process sandboxing on Linux where you control the policy and do not need a kernel boundary. The right primitive for a laptop or CI sandbox on Linux when you can write the policy yourself; not a substitute for a VM.
Local sandboxes for coding agents
Isolation for agents like Claude Code, Codex or Gemini CLI on your own laptop.
Docker Sandboxes
Docker’s `sbx` CLI for running AI coding agents in microVM sandboxes on your machine, with an experimental Docker-hosted cloud.
- MicroVM
- Self-hostable
- GPU
- Pause/resume
How it differs: Running coding agents unsupervised on a laptop with microVM isolation. The easiest way to give local coding agents a real microVM boundary.
LLM Sandbox vs alternatives
| Sandbox | Isolation | Open source | Self-host / BYOC | Cold start (vendor) | Max session | Snapshots / pause | GPU | SDKs |
|---|---|---|---|---|---|---|---|---|
| LLM Sandbox | Docker/Podman/K8s container | Yes | Yes / No | Not documented | Not documented | No / Not documented | Not documented | Python, MCP server |
| bubblewrap | Linux namespaces | Yes | Yes / No | Not documented | Not documented | No / No | Not documented | CLI |
| Docker Sandboxes | MicroVM | No | Yes / No | Not documented | Until removed (local) | Yes / Yes | Yes | sbx CLI, TypeScript (cloud), REST API (cloud) |
| Judge0 | isolate (namespaces/cgroups) | Yes | Yes / No | Not documented | 5 s wall (max 20 s) | No / No | No | REST API, Python, JavaScript/TypeScript |
| OpenHands Runtime | Docker container | Yes | Yes / No | Not documented | Not documented | Not documented / Not documented | Not documented | Python, JavaScript/TypeScript, REST API |
| SWE-ReX | Docker / Modal / Fargate | Yes | Yes / No | Not documented | Not documented | No / Not documented | Not documented | Python, REST API |
Frequently asked questions
What are the main alternatives to LLM Sandbox?
Is there an open-source alternative to LLM Sandbox?
Cite this page
Agent Sandboxes. (2026). LLM Sandbox alternatives. agentsandboxes.org. Last reviewed November 9, 2026. https://agentsandboxes.org/alternatives/llm-sandbox/
Found an error or a missing sandbox? Submit a correction — every entry links to the sources it relies on.