LangSmith Sandboxes vs Modal

LangSmith Sandboxes costs $0.0576 per vCPU-hour and Modal costs $0.070956 per vCPU-hour. LangSmith Sandboxes runs Firecracker microVMs. Modal runs gVisor, offers GPUs and limits a session to 24 hours.

Updated

LangSmith Sandboxes

Isolation
Firecracker microVM
Free tier
Credit of 8 LSU every month
Max session
Not listed

Modal

Isolation
gVisor
Free tier
$30 credit every month
Max session
24 hours

What is different

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

LangSmith Sandboxes
Modal
vCPU, per hour
LangSmith Sandboxes: $0.0576
Modal: $0.070956
RAM, per GiB-hour
LangSmith Sandboxes: $0.01845
Modal: $0.024012
Free tier
LangSmith Sandboxes: Credit of 8 LSU every month
Modal: $30 credit every month
Isolation
LangSmith Sandboxes: Firecracker microVM
Modal: gVisor
SDKs
LangSmith Sandboxes: Python, TypeScript
Modal: Python, JavaScript / TypeScript, Go
Integrations
LangSmith Sandboxes: LangChain
Modal: Claude Agent SDK

Full comparison

18 fields, at each provider's list price

Pricing

vCPU, per hour
LangSmith Sandboxes: $0.0576
Modal: $0.070956
RAM, per GiB-hour
LangSmith Sandboxes: $0.01845
Modal: $0.024012
Storage
LangSmith Sandboxes: $0.000123 per GiB-hour
Modal: Not listed
Free tier
LangSmith Sandboxes: Credit of 8 LSU every month
Modal: $30 credit every month
Paid plan from
LangSmith Sandboxes: Not listed
Modal: Pay as you go
Billing
LangSmith Sandboxes: Per second
Modal: Per second

Limits

Max session
LangSmith Sandboxes: Not listed
Modal: 24 hours
Idle stop
LangSmith Sandboxes: After 10 minutes
Modal: Not listed
Largest sandbox
LangSmith Sandboxes: 16 vCPU · 64 GiB
Modal: Not listed
Concurrent sandboxes
LangSmith Sandboxes: Not listed
Modal: Not listed

Platform

Isolation
LangSmith Sandboxes: Firecracker microVM
Modal: gVisor
GPU
LangSmith Sandboxes: Not listed
Modal:
Snapshots
LangSmith Sandboxes:
Modal:
Pause and resume
LangSmith Sandboxes:
Modal: Not listed

Developer

SDKs
LangSmith Sandboxes: Python, TypeScript
Modal: Python, JavaScript / TypeScript, Go
Integrations
LangSmith Sandboxes: LangChain
Modal: Claude Agent SDK

Trust

License
LangSmith Sandboxes: Not listed
Modal: Not listed
BYOC
LangSmith Sandboxes: Enterprise plan
Modal: Not listed

Hourly cost

One sandbox running for one hour

LangSmith Sandboxes
Modal
1 vCPU · 2 GiB
LangSmith Sandboxes: $0.095
Modal: $0.119
2 vCPU · 4 GiB
LangSmith Sandboxes: $0.189
Modal: $0.238
4 vCPU · 8 GiB
LangSmith Sandboxes: $0.378
Modal: $0.476

Compute only, at list rates.

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Which one fits

Based on the fields above

LangSmith Sandboxes fits when

  • You want each sandbox in its own microVM.
  • You use LangChain.
  • You want the lower list price: $0.189 against $0.238 an hour for 2 vCPU and 4 GiB.
  • You need pause and resume.

Modal fits when

  • You need GPUs.
  • You use the Claude Agent SDK.
  • You want the larger free credit: $30 against $8.
  • You need a desktop in the sandbox.

More comparisons

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