LangSmith Sandboxes vs Solari

LangSmith Sandboxes costs $0.0576 per vCPU-hour and Solari costs $0.0525 per vCPU-hour. LangSmith Sandboxes runs Firecracker microVMs. Solari runs Cloud Hypervisor microVMs 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

Solari

Isolation
Cloud Hypervisor microVM
Free tier
$3 credit every month
Max session
24 hours

What is different

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

LangSmith Sandboxes
Solari
vCPU, per hour
LangSmith Sandboxes: $0.0576
Solari: $0.0525
RAM, per GiB-hour
LangSmith Sandboxes: $0.01845
Solari: $0.0165
Storage
LangSmith Sandboxes: $0.000123 per GiB-hour
Solari: Snapshots $0.05 per GB-month, the first 10 GB per organization free, from October 1, 2026.
Free tier
LangSmith Sandboxes: Credit of 8 LSU every month
Solari: $3 credit every month
Paid plan from
LangSmith Sandboxes: Pay as you go
Solari: $20 / month
Largest sandbox
LangSmith Sandboxes: 16 vCPU · 64 GiB
Solari: 8 vCPU · 16 GiB
Isolation
LangSmith Sandboxes: Firecracker microVM
Solari: Cloud Hypervisor microVM
SDKs
LangSmith Sandboxes: Python, TypeScript
Solari: TypeScript, Python, Go, Rust
Integrations
LangSmith Sandboxes: LangChain, MCP
Solari: MCP, Claude Code

Full comparison

18 fields, at each provider's list price

Pricing

vCPU, per hour
LangSmith Sandboxes: $0.0576
Solari: $0.0525
RAM, per GiB-hour
LangSmith Sandboxes: $0.01845
Solari: $0.0165
Storage
LangSmith Sandboxes: $0.000123 per GiB-hour
Solari: Snapshots $0.05 per GB-month, the first 10 GB per organization free, from October 1, 2026.
Free tier
LangSmith Sandboxes: Credit of 8 LSU every month
Solari: $3 credit every month
Paid plan from
LangSmith Sandboxes: Pay as you go
Solari: $20 / month
Billing
LangSmith Sandboxes: Per second
Solari: Per second

Limits

Max session
LangSmith Sandboxes: Not listed
Solari: 24 hours
Idle stop
LangSmith Sandboxes: After 10 minutes
Solari: Not listed
Largest sandbox
LangSmith Sandboxes: 16 vCPU · 64 GiB
Solari: 8 vCPU · 16 GiB
Concurrent sandboxes
LangSmith Sandboxes: Not listed
Solari: Up to 10

Platform

Isolation
LangSmith Sandboxes: Firecracker microVM
Solari: Cloud Hypervisor microVM
GPU
LangSmith Sandboxes: Not listed
Solari: Not listed
Snapshots
LangSmith Sandboxes:
Solari:
Pause and resume
LangSmith Sandboxes:
Solari:

Developer

SDKs
LangSmith Sandboxes: Python, TypeScript
Solari: TypeScript, Python, Go, Rust
Integrations
LangSmith Sandboxes: LangChain, MCP
Solari: MCP, Claude Code

Trust

License
LangSmith Sandboxes: Not listed
Solari: Not listed
BYOC
LangSmith Sandboxes: Enterprise plan
Solari: Enterprise plan, in your own VPC

Hourly cost

One sandbox running for one hour

LangSmith Sandboxes
Solari
1 vCPU · 2 GiB
LangSmith Sandboxes: $0.095
Solari: $0.086
2 vCPU · 4 GiB
LangSmith Sandboxes: $0.189
Solari: $0.171
4 vCPU · 8 GiB
LangSmith Sandboxes: $0.378
Solari: $0.342

Compute only, at list rates.

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Which one fits

Based on the fields above

LangSmith Sandboxes fits when

  • You want to pay only for usage, with no plan fee.
  • You use LangChain.
  • You want the larger free credit: $8 against $3.
  • You need a sandbox larger than 8 vCPU · 16 GiB.

Solari fits when

  • You use Claude Code.
  • You want the lower list price: $0.171 against $0.189 an hour for 2 vCPU and 4 GiB.
  • You need a desktop in the sandbox.

More comparisons

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