AWS Lambda MicroVMs alternatives
The 6 alternatives below are grouped by kind of sandbox, and each says what it does differently from AWS Lambda MicroVMs. Start from whatever made you look: missing GPUs, session limits, self-hosting, pricing or isolation.
Why teams look beyond AWS Lambda MicroVMs
The AWS-native way to get Firecracker-isolated, suspendable sandboxes with a per-VM endpoint, within an 8-hour lifetime and without a higher-level sandbox SDK.
- Hard 8-hour maximum lifetime per MicroVM, including suspended time
- No GPU sizes; largest baseline is 8 GB / 4 vCPU (32 GB / 16 vCPU at peak) with 32 GB disk
- Images must be built by Lambda from a Dockerfile on a managed base image; snapshot compatibility caveats apply (unique state generated at build is shared by every MicroVM)
- No SDK abstraction for exec/files — you expose your own HTTP service inside the VM and talk to it through the endpoint
AWS Lambda MicroVMs alternatives, by kind
Hosted sandbox platforms
SDK-driven sandboxes you create, run code in and destroy through an API.
E2B
Open-source cloud sandboxes for AI agents, each a Firecracker microVM, with pause/resume, snapshots and forking.
- Firecracker microVM
- Open source
- Self-hostable
- BYOC
- Pause/resume
How it differs: Code interpreters and short-to-medium-lived agent tasks that need microVM isolation, with an open-source self-host path. The safe default for most agent builders: mature, open source, microVM-isolated and widely supported.
Compute platforms with sandboxes
General serverless or app platforms that also offer sandboxes, often with GPUs.
Fly Machines
Fly.io's low-level API for Firecracker VMs that start and stop in under a second and can be suspended to disk; the primitive underneath Fly.io's Sprites product.
- Firecracker microVM
- Pause/resume
How it differs: Teams that want raw, per-second-billed Firecracker VMs they orchestrate themselves rather than a sandbox SDK. A fast, well-priced Firecracker VM primitive for teams that want to assemble their own sandbox layer; for an agent-ready product on the same infrastructure look at Fly.io Sprites.
Modal Sandboxes
Sandboxes on Modal’s serverless compute platform for running untrusted code at very high scale, with GPUs, snapshots and tunnels.
- gVisor or VM
- GPU
- Pause/resume
How it differs: High-concurrency and GPU-backed sandboxes — RL rollouts, evals and coding agents at scale. The best fit when scale or GPUs matter most, especially for teams already on Modal.
Cloud provider code execution
Managed code-execution tools from AWS, Azure, Google Cloud and OpenAI.
AWS Bedrock AgentCore
AWS’s managed agent platform: a Code Interpreter tool for running agent-generated code and a Runtime that hosts each agent session in its own microVM.
- MicroVM (Runtime)
How it differs: Teams already on AWS that need IAM- and VPC-integrated code execution for agents. The natural default for AWS-centric teams; less attractive if you want portability or a provider-neutral SDK.
Azure Container Apps dynamic sessions
Azure service that hands out Hyper-V-isolated sessions from prewarmed pools, either as a built-in code interpreter or running your own container image.
- Hyper-V VM
How it differs: Azure-native apps running LLM-generated Python or Node code with egress off by default. A solid, locked-down code interpreter for Azure shops; not designed for long-lived coding agents.
Open-source runtimes to self-host
Open-source sandbox runtimes you run on your own servers or Kubernetes.
Kubernetes Agent Sandbox
Open-source Kubernetes controller and CRDs for isolated, stateful sandbox pods for AI agents, with first-class support on GKE.
- gVisor or Kata
- Open source
- Self-hostable
- BYOC
- GPU
- Pause/resume
How it differs: Platform teams that want to run agent sandboxes on their own Kubernetes or GKE clusters. The leading open, Kubernetes-native way to self-host agent sandboxes, especially on GKE.
AWS Lambda MicroVMs vs alternatives
| Sandbox | Isolation | Open source | Self-host / BYOC | Cold start (vendor) | Max session | Snapshots / pause | GPU | SDKs |
|---|---|---|---|---|---|---|---|---|
| AWS Lambda MicroVMs | Firecracker microVM | No | No / No | sub-second to seconds (claimed) | 8 h | Yes / Yes | No | Python, JavaScript/TypeScript, PHP, CLI, REST API |
| AWS Bedrock AgentCore | MicroVM (Runtime) | No | No / No | Not documented | Up to 8 h | Not documented / Not documented | No | Python (AgentCore SDK), AWS SDKs, AWS CLI |
| Azure Container Apps dynamic sessions | Hyper-V VM | No | No / No | Sub-second (pooled) | 220 s / exec | No / No | No | REST API, Azure CLI, LangChain, LlamaIndex, Semantic Kernel |
| E2B | Firecracker microVM | Yes | Yes / Yes | Not documented | 1 h / 24 h (Pro) | Yes / Yes | No | Python, JavaScript/TypeScript |
| Fly Machines | Firecracker microVM | No | No / No | <1 s start (claimed) | Not documented | Yes / Yes | Not documented | Go, CLI, REST API |
| Kubernetes Agent Sandbox | gVisor or Kata | Yes | Yes / Yes | <1 s (warm pool) | Not documented | Yes / Yes | Yes | Kubernetes CRDs, Python, kubectl |
| Modal Sandboxes | gVisor or VM | No | No / Not documented | <1 s | Up to 24 h | Yes / Yes | Yes | Python, JavaScript/TypeScript, Go |
Frequently asked questions
What are the main alternatives to AWS Lambda MicroVMs?
Is there an open-source alternative to AWS Lambda MicroVMs?
Cite this page
Agent Sandboxes. (2026). AWS Lambda MicroVMs alternatives. agentsandboxes.org. Last reviewed November 9, 2026. https://agentsandboxes.org/alternatives/aws-lambda-microvms/
Found an error or a missing sandbox? Submit a correction — every entry links to the sources it relies on.