# Celesto AI

> Drop-in GitHub Actions runners, nearly 90% cheaper per minute than GitHub on the same hardware. Change one line, plus sandboxes for AI agents.

Celesto is two layers that work as one. Sandboxes are hardware-isolated microVMs that boot in under 2 seconds and give an agent a real machine: a shell, a filesystem, and a full browser driven over CDP or VNC, with a disk that survives stop and start and an internet off switch for untrusted code. The agent runtime is where the harness itself is built and run: define an agent, connect tools and MCP servers, and deploy it. The harness runs outside the sandbox, because the sandbox is disposable and an agent should not control its own loop, but co-located with it so tool calls never cross the internet.

## Hosted MCP

- [Celesto for agents (MCP)](https://celesto.ai/agents.md): Hosted MCP URL, OAuth, and `cloud_computer_*` tools for cloud sandboxes
- MCP endpoint: `https://mcp.celesto.ai/mcp` (streamable HTTP, OAuth 2.1 DCR + PKCE)
- [Smithery — Celesto MCP](https://smithery.ai/servers/celesto/mcp): Installable listing of the same hosted server
- [Celesto Sandboxes (Markdown)](https://celesto.ai/sandboxes.md): Every sandbox feature with the command, SDK call, or console control that uses it

## Product

- [Celesto — Ship faster at agent-scale with cheaper CI runners](https://celesto.ai/): Drop-in GitHub Actions runners, nearly 90% cheaper per minute than GitHub on matching hardware, and isolated cloud sandboxes for AI agents
- [The cheapest GitHub Actions runners — Celesto CI](https://celesto.ai/ci): Managed GitHub Actions runners with Micro compute at $0.00025/minute and a one-time $5 trial for up to 20,000 runtime minutes
- [Compare Celesto with other providers — Celesto](https://celesto.ai/compare): Index of Celesto comparisons with other providers: CI runners and platforms (GitHub Actions, Blacksmith, Tenki CI, Depot, WarpBuild, Ubicloud, Namespace, RunsOn, Actuated, Cirun, Avrea, Latchkey, Instabox, Boat CI, Bitrise Build Hub, Buildkite, CircleCI, GitLab CI/CD, AWS CodeBuild, Azure Pipelines) and AI agent sandboxes (Agent37, E2B, Daytona, Modal, Blaxel, Freestyle, Tensorlake, Tenki, Boat, AWS, Google Cloud, Hetzner)
- [Celesto vs Depot: CI pricing and runners compared](https://celesto.ai/compare/depot): Compare matched Linux runner rates, plan allowances, Docker build caching, and platform support. Celesto keeps GitHub Actions with low runtime pricing and no monthly runner plan
- [Celesto vs WarpBuild: CI pricing and runners compared](https://celesto.ai/compare/warpbuild): Compare Celesto and WarpBuild Linux runner pricing on matching CPU and memory, caching, managed and BYOC options, and macOS and Windows support
- [Celesto vs Ubicloud: CI pricing and runners compared](https://celesto.ai/compare/ubicloud): Compare matched Linux runner rates, standard and premium availability, included usage, and caching. See where Celesto fits without assuming equal job performance
- [Celesto vs Avrea: CI pricing and runners compared](https://celesto.ai/compare/avrea): Compare Celesto and Avrea GitHub Actions runners: matching Linux compute rates, workflow migration, caching, and platform tradeoffs
- [Celesto vs Latchkey: CI pricing and runners compared](https://celesto.ai/compare/latchkey): Compare Celesto and Latchkey GitHub Actions runners: matched Linux list rates, dependency caching, billing, and workflow migration
- [Celesto vs Namespace: CI pricing and runners compared](https://celesto.ai/compare/namespace): Compare Celesto with Namespace: matched Linux prepaid and pay-as-you-go rates, monthly commitments, cache volumes, remote builds, and platform support
- [Celesto vs RunsOn: CI pricing and runners compared](https://celesto.ai/compare/runs-on): Compare managed Celesto CI with RunsOn in your AWS account: runtime pricing versus annual licensing plus infrastructure, configuration, and workload fit
- [Celesto vs Actuated: CI pricing and runners compared](https://celesto.ai/compare/actuated): Compare Celesto CI with Actuated: managed runtime pricing versus per-server subscription and your own hardware, isolation, architecture support, and operations
- [Celesto vs Cirun: CI pricing and runners compared](https://celesto.ai/compare/cirun): Compare Celesto with Cirun GitHub Actions runners: managed runtime pricing versus subscription plus cloud infrastructure, setup, custom images, and hardware options
- [Celesto vs Instabox: CI pricing and runners compared](https://celesto.ai/compare/instabox): Compare Celesto CI with Instabox GitHub Actions runners: compute rates, recurring plans, free usage, storage, runner sizes, and workload fit
- [Celesto vs Boat CI: CI pricing and runners compared](https://celesto.ai/compare/boat-ci): Compare Celesto and Boat GitHub Actions runners: published compute rates, monthly plans, dependency caching, job limits, debugging, and migration
- [Celesto vs Buildkite: CI pricing and runners compared](https://celesto.ai/compare/buildkite): Compare Celesto CI and Buildkite: GitHub Actions runners versus a separate CI platform, hosted and self-hosted agents, billing, and migration effort
- [Celesto vs CircleCI: CI pricing and runners compared](https://celesto.ai/compare/circleci): Compare Celesto CI with CircleCI: GitHub Actions compatibility, credit-based compute, platform features, caching, and migration requirements
- [Celesto vs GitLab CI/CD: CI pricing and runners compared](https://celesto.ai/compare/gitlab-ci): Compare Celesto CI with GitLab CI/CD: GitHub Actions runners versus integrated GitLab pipelines, hosted and self-managed execution, billing, and migration
- [Celesto vs AWS CodeBuild: CI pricing and runners compared](https://celesto.ai/compare/aws-codebuild): Compare Celesto CI with AWS CodeBuild: managed Linux runners, GitHub Actions integration, AWS account setup, compute billing, and private-network access
- [Celesto vs Azure Pipelines: CI pricing and runners compared](https://celesto.ai/compare/azure-pipelines): Compare Celesto CI with Azure Pipelines: GitHub Actions runners versus Azure DevOps pipelines, parallel-job billing, platforms, and migration
- [Celesto vs Bitrise Build Hub: GitHub Actions runners compared](https://celesto.ai/compare/bitrise-build-hub): Compare Celesto CI and Bitrise Build Hub: Linux runtime pricing, monthly compute budgets, Apple silicon, mobile toolchains, caching, and migration
- [Celesto vs Agent37: VM sandboxes, pricing and tools compared](https://celesto.ai/compare/agent37): Celesto compared with Agent37 Cloud: KVM vs gVisor isolation, included vs metered disk, browser and MCP workflows, GitHub Actions runners with dependency caching, and Agent37’s lower running-hour prices
- [Celesto vs Blacksmith: GitHub Actions runner pricing compared](https://celesto.ai/compare/blacksmith): Celesto CI compared with Blacksmith: 6× more CI per dollar (83% less per minute) on matching Linux x64 runners, caching, and platform support
- [Celesto vs GitHub Actions: Runner pricing and speed](https://celesto.ai/compare/github-actions): Celesto CI compared with GitHub Actions: 9× more CI per dollar (89% less per minute) on 2 vCPU · 8 GB, a public matched benchmark (Celesto +18% CPU, GitHub about 2× faster cache), free minutes, and platforms
- [Celesto vs E2B: AI agent sandboxes compared — Celesto](https://celesto.ai/compare/e2b): Celesto compared with E2B: 81% less per running hour on matching CPU and memory, isolation, browser and desktop, pause and resume, egress, MCP, and self-hosting
- [Celesto vs Daytona: AI agent sandboxes compared — Celesto](https://celesto.ai/compare/daytona): Celesto compared with Daytona: VM vs container isolation, 81% less per running hour on matching CPU and memory, browser, storage, egress, MCP, and APIs
- [Celesto vs Modal: AI agent sandboxes compared — Celesto](https://celesto.ai/compare/modal): Celesto compared with Modal Sandboxes: 87% less per running hour on matching CPU and memory, VM vs gVisor isolation, SSH and shell access, 24-hour lifetime, browser, snapshots, and GPUs
- [Celesto vs Blaxel: AI agent sandboxes compared — Celesto](https://celesto.ai/compare/blaxel): Celesto compared with Blaxel: 81% less per active hour, disk included, against Blaxel's standby that resumes in about 25 ms with memory intact
- [Celesto vs Freestyle: AI agent sandboxes compared — Celesto](https://celesto.ai/compare/freestyle): Celesto compared with Freestyle VMs: 77% less per running hour, size selection, browser, MCP, snapshots, networking, and free usage
- [Celesto vs Tensorlake: AI agent sandboxes compared — Celesto](https://celesto.ai/compare/tensorlake): Celesto compared with Tensorlake sandboxes: 74% less per running hour, disk included, MCP, suspend and snapshots, SSH, egress rules, GPUs, and AWS BYOC
- [Celesto vs Tenki CI: GitHub Actions runner pricing and caching](https://celesto.ai/compare/tenki-ci): Celesto CI compared with Tenki runners: matched 2 vCPU / 4 GB pricing, built-in dependency caching, cache storage charges, credits, platform support and migration
- [Celesto vs Tenki: AI agent sandboxes compared — Celesto](https://celesto.ai/compare/tenki): Celesto compared with Tenki: 81% less per running hour on matching sandboxes, built-in browser and desktop, memory snapshots, egress rules, and GitHub Actions runners
- [Celesto vs Boat: AI agent sandboxes compared — Celesto](https://celesto.ai/compare/boat): Celesto compared with Boat (boat.dev): plan vs pay-as-you-go pricing, sizes, SSH, snapshots and forks, browser, egress control, and MCP
- [Celesto vs AWS: AI agent sandboxes compared — Celesto](https://celesto.ai/compare/aws): Celesto compared with AWS Bedrock AgentCore Code Interpreter, Browser, and Lambda MicroVMs: 84% less per hour, session length, size caps, browser, shell, and network modes
- [Celesto vs Google Cloud: AI agent sandboxes compared — Celesto](https://celesto.ai/compare/google-cloud): Celesto compared with Google Cloud Agent Platform Sandboxes and GKE Agent Sandbox: 83% less per hour, root and shell access, cold start, browser, lifetime, and free tier
- [Celesto vs Hetzner: AI agent sandboxes compared — Celesto](https://celesto.ai/compare/hetzner): Celesto compared with Hetzner Cloud servers for AI agents: billing while stopped, break-even hours, agent tooling, SSH, and network controls
- [Computer-Use Agents — Celesto](https://celesto.ai/cua): Demonstrated computer-use workflows turned into API-callable automations with retries and human takeover
- [Run Pi Coding Agent in the Cloud — Celesto](https://celesto.ai/pi-coding-agent): Run the Pi coding agent on a cloud computer, free to start
- [Cloud sandboxes for AI agents: terminal, desktop, browser — Celesto](https://celesto.ai/sandboxes): Every shipped sandbox feature with how to use it: terminals, desktop view, CDP browser, preview URLs, network control, persistence, sizes, MCP, and SDKs

## Pricing

- [Pricing — Celesto](https://celesto.ai/pricing): Six sandbox sizes with usage pricing and a card-free trial

Sandbox runtime prices:
- Micro — $0.015/running hour; 1 vCPU, 2 GB RAM, 20 GB included root disk
- Small — $0.020/running hour; 1 vCPU, 4 GB RAM, 25 GB included root disk
- Standard — $0.030/running hour; 2 vCPU, 4 GB RAM, 30 GB included root disk
- Memory — $0.040/running hour; 2 vCPU, 8 GB RAM, 40 GB included root disk
- Large — $0.080/running hour; 4 vCPU, 16 GB RAM, 60 GB included root disk
- XL — $0.160/running hour; 8 vCPU, 32 GB RAM, 100 GB included root disk

## Company

- [Security — Celesto](https://celesto.ai/security): Security boundaries, GitHub App permissions, microVM isolation, JIT runner credentials, and resource lifecycles
- [Contact — Celesto](https://celesto.ai/contact): Contact the team
- [Events — Meet Celesto in person](https://celesto.ai/events): Meet Celesto at AI engineering events and demo floors
- [Meet Celesto at Unicorn AI Summit — Bengaluru](https://celesto.ai/events/2026/unicorn-ai-summit): Celesto booth and 60-second AI challenge at Unicorn AI Summit in Bengaluru
- [Design Partner Program — Celesto](https://celesto.ai/become-design-partner): Work with us on turning a real workflow into a reliable automation

## Legal

- [Terms of Service — Celesto](https://celesto.ai/legal/terms): Terms of Service
- [Privacy Policy — Celesto](https://celesto.ai/legal/privacy-policy): Privacy Policy
- [Subprocessors — Celesto](https://celesto.ai/legal/subprocessors): Third-party subprocessors

## Documentation

- [Documentation](https://celesto.ai/docs): Guides, SDK reference, and deployment docs
- [Blog](https://celesto.ai/blog): Engineering and product writing from the Celesto team