Sandbox Runtime
A general-purpose tool for wrapping security boundaries around arbitrary processes.
Pricing
Free tier
Flat rate
Adoption
↗RisingLicense
Open Source
Data freshness
Verified · Jul 16, 2026Overview
What is Sandbox Runtime?
Anthropic Sandbox Runtime (ASRT) provides a secure environment to run untrusted code, ensuring that processes are isolated and safe. It is essential for developers who need to execute potentially risky applications without compromising system integrity.
Key differentiator
“ASRT stands out as an open-source, lightweight solution for securely running untrusted processes, offering developers a reliable way to test and execute code without compromising system security.”
Capability profile
Capability Radar
Honest assessment
Strengths & Weaknesses
↑ Strengths
↓ Weaknesses
API requires Python-specific patterns, TypeScript SDK is community-maintained
v0.1 to v0.2 migration required rewriting chain definitions
Primary focus on JS/TS, no official support for other languages like Python or Go
Requires manual configuration of sandbox environments and dependencies
Fit analysis
Who is it for?
✓ Best for
Teams developing security-sensitive applications who need to test untrusted code safely.
Individual developers working on projects that require secure execution environments.
✕ Not a fit for
Projects requiring real-time interaction with the sandboxed environment
Applications where performance overhead is a critical concern
Cost structure
Pricing
Free Tier
Available
Open source — free to use
Starts at
$0
Model
Flat rate
Enterprise
None
Performance benchmarks
How Fast Is It?
Ecosystem
Relationships
Integrations
Next step
Get Started with Sandbox Runtime
Step-by-step setup guide with code examples and common gotchas.