Runtime vs Sandbox0

Runtime costs $0.025 per vCPU-hour. Sandbox0 bills memory only, at $0.015 per GiB-hour. Runtime runs Firecracker microVMs and has no session limit. Sandbox0 runs gVisor and has no session limit.

Updated

Runtime

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

Sandbox0

Isolation
gVisor
Free tier
$5 credit, one time
Max session
No limit

What is different

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

Runtime
Sandbox0
vCPU, per hour
Runtime: $0.025
Sandbox0: Included
RAM, per GiB-hour
Runtime: $0.0075
Sandbox0: $0.015
Storage
Runtime: $0.000119 per GiB-hour after 10 free GiB
Sandbox0: $0.02 per GiB-month for retained RootFS changes and memory checkpoints. Shared base images are free
Free tier
Runtime: 100 hours of a 1 GB machine in the first 30 days
Sandbox0: $5 credit, one time
Billing
Runtime: Active CPU time only
Sandbox0: Memory only
Concurrent sandboxes
Runtime: Up to 200
Sandbox0: Up to 20
Isolation
Runtime: Firecracker microVM
Sandbox0: gVisor
SDKs
Runtime: JavaScript / TypeScript, Python, Go, Ruby, Java
Sandbox0: Go, Python, JavaScript / TypeScript
Integrations
Runtime: OpenAI Agents SDK, Vercel AI SDK, Claude Agent SDK, LangChain, MCP, Claude Code
Sandbox0: LangChain, OpenAI Agents SDK

Full comparison

18 fields, at each provider's list price

Pricing

vCPU, per hour
Runtime: $0.025
Sandbox0: Included
RAM, per GiB-hour
Runtime: $0.0075
Sandbox0: $0.015
Storage
Runtime: $0.000119 per GiB-hour after 10 free GiB
Sandbox0: $0.02 per GiB-month for retained RootFS changes and memory checkpoints. Shared base images are free
Free tier
Runtime: 100 hours of a 1 GB machine in the first 30 days
Sandbox0: $5 credit, one time
Paid plan from
Runtime: Pay as you go
Sandbox0: Pay as you go
Billing
Runtime: Active CPU time only
Sandbox0: Memory only

Limits

Max session
Runtime: No limit
Sandbox0: No limit
Idle stop
Runtime: After 5 minutes
Sandbox0: Not listed
Largest sandbox
Runtime: 16 vCPU · 64 GiB
Sandbox0: Not listed
Concurrent sandboxes
Runtime: Up to 200
Sandbox0: Up to 20

Platform

Isolation
Runtime: Firecracker microVM
Sandbox0: gVisor
GPU
Runtime: No
Sandbox0: Not listed
Snapshots
Runtime:
Sandbox0:
Pause and resume
Runtime:
Sandbox0:

Developer

SDKs
Runtime: JavaScript / TypeScript, Python, Go, Ruby, Java
Sandbox0: Go, Python, JavaScript / TypeScript
Integrations
Runtime: OpenAI Agents SDK, Vercel AI SDK, Claude Agent SDK, LangChain, MCP, Claude Code
Sandbox0: LangChain, OpenAI Agents SDK

Trust

License
Runtime: Not listed
Sandbox0: Not listed
BYOC
Runtime: Not listed
Sandbox0: No

Hourly cost

One sandbox running for one hour

Runtime
Sandbox0
1 vCPU · 2 GiB
Runtime: $0.040
Sandbox0: $0.030
2 vCPU · 4 GiB
Runtime: $0.080
Sandbox0: $0.060
4 vCPU · 8 GiB
Runtime: $0.160
Sandbox0: $0.120

Compute only, at list rates.

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Which one fits

Based on the fields above

Runtime fits when

  • You want each sandbox in its own microVM.
  • You use the Vercel AI SDK, the Claude Agent SDK, MCP or Claude Code.
  • You need a desktop in the sandbox.
  • Your code waits a lot: CPU is billed only while it is in use.

Sandbox0 fits when

  • You want the lower list price: $0.060 against $0.080 an hour for 2 vCPU and 4 GiB.
  • You want one rate for memory, with CPU included.

More comparisons

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