Koyeb Sandboxes
Ephemeral microVM sandboxes on Koyeb’s serverless platform for AI-generated code, with CPU or GPU and scale-to-zero. Promising GPU-capable microVMs, but still preview — evaluate as it matures within Mistral.
Overview
Koyeb added microVM sandboxes to its serverless platform in public preview in November 2025, with CPU and GPU options and scale-to-zero. In February 2026 Mistral AI announced Koyeb as its first acquisition, with Koyeb expected to become part of Mistral Compute.
Notable
- Mistral AI announced its acquisition of Koyeb on February 17, 2026.
- Sandboxes launched in public preview in November 2025.
Koyeb Sandboxes specifications
| Attribute | Details |
|---|---|
| Isolation | MicroVMs on bare-metal servers |
| Deployment | Hosted platform |
| Open source | No (SDKs Apache-2.0) |
| SDKs and interfaces | Python, JavaScript/TypeScript |
| Cold start (vendor claim) | No sandbox-specific figure; platform cold starts “as low as 250 ms” (vendor claim) |
| Max session length | Auto-deletion configurable from 60 seconds to 24 hours |
| Persistence | Ephemeral by design with scale-to-zero deep sleep |
| GPU | Yes — CPU and GPU sandboxes (platform GPUs from $0.50/hour to B200 at $5.50/hour) |
| Networking | expose_port returns a public URL; egress controls not documented |
| Pricing | Usage-based on paid plans (Pro $29/month); sandboxes from $0.000001 per second (launch blog) |
| Free tier | No sandbox free tier stated |
| Compliance | SOC 2 and ISO 27001 (platform-wide) |
| Regions | 10 regions across 3 continents (platform) |
Facts from Koyeb Sandboxes’s public documentation, verified November 8, 2026. Performance numbers are vendor claims.
Strengths and trade-offs
Strengths
- You want GPU-capable microVM sandboxes
- You already deploy on Koyeb
- You are aligned with the Mistral ecosystem
Trade-offs
- Still in public preview
- Persistence and egress controls not documented
- Roadmap tied to Mistral integration
Best for: Teams already on Koyeb or in the Mistral ecosystem that want GPU-capable ephemeral sandboxes.
Where Koyeb Sandboxes ranks
How Koyeb Sandboxes compares
| Sandbox | Isolation | Open source | Self-host / BYOC | Cold start (vendor) | Max session | Snapshots / pause | GPU | SDKs |
|---|---|---|---|---|---|---|---|---|
| Koyeb Sandboxes | MicroVM | No | No / Not documented | Not documented | Up to 24 h | Not documented / Not documented | Yes | Python, JavaScript/TypeScript |
| Modal Sandboxes | gVisor or VM | No | No / Not documented | <1 s | Up to 24 h | Yes / Yes | Yes | Python, JavaScript/TypeScript, Go |
| Beam Sandboxes | gVisor | Yes | Yes / Yes | ~0.5 s | Configurable | Yes / Yes | Yes | Python, TypeScript |
| E2B | Firecracker microVM | Yes | Yes / Yes | Not documented | 1 h / 24 h (Pro) | Yes / Yes | No | Python, JavaScript/TypeScript |
| Northflank Sandboxes | Cloud Hypervisor microVM | No | No / Yes | <1 s | Unlimited | Not documented / Yes | Yes | JavaScript/TypeScript, Python |
Frequently asked questions
What is Koyeb Sandboxes?
How does Koyeb Sandboxes isolate code?
Is Koyeb Sandboxes open source?
How much does Koyeb Sandboxes cost?
What are the best Koyeb Sandboxes alternatives?
Sources
Cite this page
Agent Sandboxes. (2026). Koyeb Sandboxes. agentsandboxes.org. Last reviewed November 8, 2026. https://agentsandboxes.org/sandboxes/koyeb/
Found an error or a missing sandbox? Submit a correction — every entry links to the sources it relies on.