About Runtime
Runtime Cloud is a cloud for AI agents' code: Linux sandboxes, each a Firecracker microVM, billed on the CPU they use. An agent creates, drives and stops each one by API, CLI, MCP or SDK, on servers Runtime operates.
What it runs
Each sandbox is a Firecracker microVM on servers Runtime runs itself, with Python, Node, Bun, git, a compiler and sudo.
20 products are available today: Sandboxes, Code interpreter, Network rules, Secrets, Images, Volumes, Snapshots, Previews, Desktop, Metrics, Webhooks, OpenTelemetry, Bucket mounts, MCP servers, Custom domains, TCP ports, Dedicated addresses, Private networks, Identity tokens and Single sign-on. One account, one API, one CLI and one SDK reach all of them, and new products join the same shape as they launch (your account and its products).
What it costs
Runtime charges $0.025 per active vCPU-hour and $0.0075 per reserved GiB-hour of memory, with no plan fee and credit matched in a new account's first 30 days, which makes it 42% to 88% cheaper than fourteen other sandbox providers for an agent that spends most of its time waiting on a model. Pricing has every rate and the comparison.
How an agent starts
- llms.txt is the quickstart: connect, run a first command, switch a project from another provider and report the saving, with no other page.
- MCP: remote clients add https://api.withruntime.com/mcp and sign in through the browser. Local clients run
npx -y withruntime mcp. - SDKs:
npm i withruntimeandpip install withruntime. The HTTP API is athttps://api.withruntime.com/v1, described by its OpenAPI document. - Code written for E2B, Daytona, Vercel Sandbox or Blaxel runs by changing one import (switching).
Trust
- Security and compliance in one place, and security: isolation, keys, secrets sandboxes never see, network rules and single sign-on.
- Status: the API checked from outside every two minutes, and a real sandbox started and stopped every ten.
- Uptime Promise: Paid accounts are promised 99% API uptime each UTC calendar month, measured by the API check on this page. A month below it pays 10% of that month's charges back as service credit, without anyone asking.
- Terms, privacy, data processing, subprocessors and acceptable use.
Company
Runtime is made by Runtime LLC, 1500 N Grant St Ste N, Denver, CO 80203, United States. For help, ask in the console, run runtime feedback, or write to support@withruntime.com (feedback and support). What changed and when is in the changelog, and the logo is on the brand page.