microsandbox cloud vs Runtime

microsandbox cloud costs $0.05 per vCPU-hour and Runtime costs $0.025 per vCPU-hour. microsandbox cloud runs microVMs. Runtime runs Firecracker microVMs and has no session limit.

Updated Oct 23, 2026

microsandbox cloud

Hosted microVM sandboxes for AI agents and untrusted code.

Isolation: MicroVM
Free tier: Free plan, 5 computer-hours a month
Max session: Not listed

Visit site microsandbox cloud profile

Runtime

Firecracker microVM sandboxes for AI agents, billed on the CPU that code uses.

Isolation: Firecracker microVM
Free tier: 100 hours of a 1 GB machine in the first 30 days
Max session: No limit

Visit site Runtime profile

What is different

11 fields differ. The rest are the same or not listed.

Field

microsandbox cloud

Runtime

vCPU, per hour: microsandbox cloud: $0.05; Runtime: $0.025
RAM, per GiB-hour: microsandbox cloud: $0.0162; Runtime: $0.0075
Storage: microsandbox cloud: $0.0001 per GiB-hour; Runtime: $0.000119 per GiB-hour after 10 free GiB
Free tier: microsandbox cloud: Free plan, 5 computer-hours a month; Runtime: 100 hours of a 1 GB machine in the first 30 days
Paid plan from: microsandbox cloud: $49 / month; Runtime: Pay as you go
Billing: microsandbox cloud: Per second; Runtime: Active CPU time only
Concurrent sandboxes: microsandbox cloud: Up to 25,000; Runtime: Up to 200
Isolation: microsandbox cloud: MicroVM; Runtime: Firecracker microVM
Pause and resume: microsandbox cloud: No; Runtime:
SDKs: microsandbox cloud: Python, TypeScript, Rust, Go, Ruby; Runtime: JavaScript / TypeScript, Python, Go, Ruby, Java
Integrations: microsandbox cloud: Claude Code, MCP; Runtime: OpenAI Agents SDK, Vercel AI SDK, Claude Agent SDK, LangChain, MCP, Claude Code

Full comparison

18 fields, at each provider's list price

microsandbox cloudmicrosandbox.dev/pricingmicrosandbox.dev

Runtimewithruntime.com/pricingwithruntime.com

Pricing

vCPU, per hour: microsandbox cloud: $0.05; Runtime: $0.025
RAM, per GiB-hour: microsandbox cloud: $0.0162; Runtime: $0.0075
Storage: microsandbox cloud: $0.0001 per GiB-hour; Runtime: $0.000119 per GiB-hour after 10 free GiB
Free tier: microsandbox cloud: Free plan, 5 computer-hours a month; Runtime: 100 hours of a 1 GB machine in the first 30 days
Paid plan from: microsandbox cloud: $49 / month; Runtime: Pay as you go
Billing: microsandbox cloud: Per second; Runtime: Active CPU time only

Limits

Max session: microsandbox cloud: Not listed; Runtime: No limit
Idle stop: microsandbox cloud: Not listed; Runtime: After 5 minutes
Largest sandbox: microsandbox cloud: Not listed; Runtime: 16 vCPU · 64 GiB
Concurrent sandboxes: microsandbox cloud: Up to 25,000; Runtime: Up to 200

Platform

Isolation: microsandbox cloud: MicroVM; Runtime: Firecracker microVM
GPU: microsandbox cloud: Not listed; Runtime: No
Snapshots: microsandbox cloud:; Runtime:
Pause and resume: microsandbox cloud: No; Runtime:

Developer

SDKs: microsandbox cloud: Python, TypeScript, Rust, Go, Ruby; Runtime: JavaScript / TypeScript, Python, Go, Ruby, Java
Integrations: microsandbox cloud: Claude Code, MCP; Runtime: OpenAI Agents SDK, Vercel AI SDK, Claude Agent SDK, LangChain, MCP, Claude Code

Trust

License: microsandbox cloud: Apache-2.0; Runtime: Not listed
BYOC: microsandbox cloud: By evaluation, contact us; Runtime: Not listed

Hourly cost

One sandbox running for one hour

Size

microsandbox cloud

Runtime

1 vCPU · 2 GiB: microsandbox cloud: $0.082; Runtime: $0.040
2 vCPU · 4 GiB: microsandbox cloud: $0.165; Runtime: $0.080
4 vCPU · 8 GiB: microsandbox cloud: $0.330; Runtime: $0.160

Compute only, at list rates.

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Which one fits

Based on the fields above

microsandbox cloud fits when

You want an open-source platform (Apache-2.0) that you can self-host.
You need the sandboxes in your own cloud account.

Runtime fits when

You want to pay only for usage, with no plan fee.
You use the OpenAI Agents SDK, the Vercel AI SDK, the Claude Agent SDK or LangChain.
You want the lower list price: $0.080 against $0.165 an hour for 2 vCPU and 4 GiB.
You need pause and resume.

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microsandbox cloud

Runtime

What is different

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Pricing

Limits

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Developer

Trust

Hourly cost

Which one fits

microsandbox cloud fits when

Runtime fits when

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