Prime Sandboxes vs Runtime

Prime Sandboxes costs $0.02 per vCPU-hour and Runtime costs $0.025 per vCPU-hour. Prime Sandboxes runs microVMs and has no session limit. Runtime runs Firecracker microVMs and has no session limit.

Updated Oct 23, 2026

Prime Sandboxes

Isolated microVM sandboxes for AI agents and RL.

Isolation: MicroVM
Free tier: Not listed
Max session: No limit

Visit site Prime Sandboxes 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

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

Field

Prime Sandboxes

Runtime

vCPU, per hour: Prime Sandboxes: $0.02; Runtime: $0.025
RAM, per GiB-hour: Prime Sandboxes: $0.0125; Runtime: $0.0075
Storage: Prime Sandboxes: $0.0002 per GiB-hour; Runtime: $0.000119 per GiB-hour after 10 free GiB
Billing: Prime Sandboxes: Per second; Runtime: Active CPU time only
Concurrent sandboxes: Prime Sandboxes: Up to 1,024; Runtime: Up to 200
Isolation: Prime Sandboxes: MicroVM; Runtime: Firecracker microVM
SDKs: Prime Sandboxes: Python; Runtime: JavaScript / TypeScript, Python, Go, Ruby, Java

Full comparison

18 fields, at each provider's list price

Prime Sandboxesdocs.primeintellect.ai/sandboxes/overviewdocs.primeintellect.ai

Runtimewithruntime.com/pricingwithruntime.com

Pricing

vCPU, per hour: Prime Sandboxes: $0.02; Runtime: $0.025
RAM, per GiB-hour: Prime Sandboxes: $0.0125; Runtime: $0.0075
Storage: Prime Sandboxes: $0.0002 per GiB-hour; Runtime: $0.000119 per GiB-hour after 10 free GiB
Free tier: Prime Sandboxes: Not listed; Runtime: 100 hours of a 1 GB machine in the first 30 days
Paid plan from: Prime Sandboxes: Pay as you go; Runtime: Pay as you go
Billing: Prime Sandboxes: Per second; Runtime: Active CPU time only

Limits

Max session: Prime Sandboxes: No limit; Runtime: No limit
Idle stop: Prime Sandboxes: Not listed; Runtime: After 5 minutes
Largest sandbox: Prime Sandboxes: 16 vCPU · 64 GiB; Runtime: 16 vCPU · 64 GiB
Concurrent sandboxes: Prime Sandboxes: Up to 1,024; Runtime: Up to 200

Platform

Isolation: Prime Sandboxes: MicroVM; Runtime: Firecracker microVM
GPU: Prime Sandboxes: Not listed; Runtime: No
Snapshots: Prime Sandboxes:; Runtime:
Pause and resume: Prime Sandboxes: Not listed; Runtime:

Developer

SDKs: Prime Sandboxes: Python; Runtime: JavaScript / TypeScript, Python, Go, Ruby, Java
Integrations: Prime Sandboxes: Not listed; Runtime: OpenAI Agents SDK, Vercel AI SDK, Claude Agent SDK, LangChain, MCP, Claude Code

Trust

License: Prime Sandboxes: Not listed; Runtime: Not listed
BYOC: Prime Sandboxes: Not listed; Runtime: Not listed

Hourly cost

One sandbox running for one hour

Size

Prime Sandboxes

Runtime

1 vCPU · 2 GiB: Prime Sandboxes: $0.045; Runtime: $0.040
2 vCPU · 4 GiB: Prime Sandboxes: $0.090; Runtime: $0.080
4 vCPU · 8 GiB: Prime Sandboxes: $0.180; Runtime: $0.160

Compute only, at list rates.

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Which one fits

Based on the fields above

Runtime fits when

You use the OpenAI Agents SDK, the Vercel AI SDK, the Claude Agent SDK, LangChain, MCP or Claude Code.
You want the lower list price: $0.080 against $0.090 an hour for 2 vCPU and 4 GiB.
You need pause and resume.
You need a desktop in the sandbox.

More comparisons

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Prime Sandboxes

Runtime

What is different

Full comparison

Pricing

Limits

Platform

Developer

Trust

Hourly cost

Which one fits

Runtime fits when

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