Modal vs xShellz Agent Shell

Modal costs $0.070956 per vCPU-hour. Modal runs gVisor, offers GPUs and limits a session to 24 hours. xShellz Agent Shell runs gVisor and has no session limit.

Updated Oct 23, 2026

Modal

Serverless compute with sandboxes and GPUs.

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

Visit site Modal profile

xShellz Agent Shell

Always-on Linux boxes for AI agents, isolated with gVisor.

Isolation: gVisor
Free tier: Free plan, 1 box with 0.5 vCPU and 512 MB
Max session: No limit

Visit site xShellz Agent Shell profile

What is different

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

Field

Modal

xShellz Agent Shell

RAM, per GiB-hour: Modal: $0.024012; xShellz Agent Shell: Included
Free tier: Modal: $30 credit every month; xShellz Agent Shell: Free plan, 1 box with 0.5 vCPU and 512 MB
Paid plan from: Modal: Pay as you go; xShellz Agent Shell: $10 / month
Billing: Modal: Per second; xShellz Agent Shell: Bundled machine time
Max session: Modal: 24 hours; xShellz Agent Shell: No limit
SDKs: Modal: Python, JavaScript / TypeScript, Go; xShellz Agent Shell: Python, JavaScript / TypeScript, Go, Java, Ruby, Rust
Integrations: Modal: Claude Agent SDK, Claude Code, LangChain; xShellz Agent Shell: MCP, Claude Code

Full comparison

18 fields, at each provider's list price

Modalmodal.com/pricing

xShellz Agent Shellxshellz.com/pricingxshellz.com

Pricing

vCPU, per hour: Modal: $0.070956; xShellz Agent Shell: Not listed
RAM, per GiB-hour: Modal: $0.024012; xShellz Agent Shell: Included
Storage: Modal: Not listed; xShellz Agent Shell: Free
Free tier: Modal: $30 credit every month; xShellz Agent Shell: Free plan, 1 box with 0.5 vCPU and 512 MB
Paid plan from: Modal: Pay as you go; xShellz Agent Shell: $10 / month
Billing: Modal: Per second; xShellz Agent Shell: Bundled machine time

Limits

Max session: Modal: 24 hours; xShellz Agent Shell: No limit
Idle stop: Modal: Not listed; xShellz Agent Shell: Not listed
Largest sandbox: Modal: Not listed; xShellz Agent Shell: 4 vCPU · 4 GiB
Concurrent sandboxes: Modal: Not listed; xShellz Agent Shell: Up to 5

Platform

Isolation: Modal: gVisor; xShellz Agent Shell: gVisor
GPU: Modal:; xShellz Agent Shell: Not listed
Snapshots: Modal:; xShellz Agent Shell: Not listed
Pause and resume: Modal: Not listed; xShellz Agent Shell:

Developer

SDKs: Modal: Python, JavaScript / TypeScript, Go; xShellz Agent Shell: Python, JavaScript / TypeScript, Go, Java, Ruby, Rust
Integrations: Modal: Claude Agent SDK, Claude Code, LangChain; xShellz Agent Shell: MCP, Claude Code

Trust

License: Modal: Not listed; xShellz Agent Shell: Not listed
BYOC: Modal: Not listed; xShellz Agent Shell: Not listed

Hourly cost

One sandbox running for one hour

Size

Modal

xShellz Agent Shell

1 vCPU · 2 GiB: Modal: $0.119; xShellz Agent Shell: Not listed
2 vCPU · 4 GiB: Modal: $0.238; xShellz Agent Shell: Not listed
4 vCPU · 8 GiB: Modal: $0.476; xShellz Agent Shell: Not listed

Compute only, at list rates.

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Which one fits

Based on the fields above

Modal fits when

You need GPUs.
You want to pay only for usage, with no plan fee.
You use the Claude Agent SDK or LangChain.
You need snapshots.

xShellz Agent Shell fits when

A session must run longer than 24 hours.
You use MCP.
You need pause and resume.

More comparisons

See all comparisons

Modal

xShellz Agent Shell

What is different

Full comparison

Pricing

Limits

Platform

Developer

Trust

Hourly cost

Which one fits

Modal fits when

xShellz Agent Shell fits when

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