# Celesto

MicroVM "agent computers" sold as agent sandboxes and as self-hosted-label runners for GitHub Actions, paid from prepaid credit.

- Operated by: Celesto AI, Inc.
- Status: Active [1]
- Website: https://celesto.ai
- Categories: CI runners, Agent sandboxes
- Checked: 31 Oct 2026

## Celesto CI (runs-on self-hosted, celesto-SIZE) (CI runners)

- Lowest price: $0.00025 /min (celesto-micro)
- 5-min job: ≥ $0.0025 (Linux x64, 2 vCPU · rank 2 of 15)
- Billed: unknown (prepaid credit)
- Sizes: 6 sizes (Linux · 1–8 vCPU)

What to know:

- Setup billed: Setup and cleanup time is billed on every job; how long it takes is not published.
- Prepaid: You buy credit up front. Whether unused credit expires is not published.
- Max job 2 h: A job is stopped after 2 h.
- Max 10 jobs: At most 10 jobs run at the same time.

### Billing

- Payment: Prepaid credit [1]
- Plan minimum: None [1]
- Billing increment: unknown (The CI page gives an illustrative per-second figure and the runner-size docs say Celesto charges per minute; no rounding rule is published) [1]
- Minimum charge: unknown (Not on pricing, CI or docs pages) [1]
- Per-job fee: None [1]
- Credit expires: unknown (Only trial credit is said to expire (30 days); pricing, CI and docs pages do not say whether paid credit expires) [1]
- Credit refundable: unknown (Not on pricing or CI pages; the terms say fees are generally non-refundable in the subscriptions section, top-ups are not addressed) [1]

### Limits

- vCPU: unknown (Not on pricing, CI or docs pages) [2]
- Concurrent jobs: 10 [2]
- Max job length: 2 h [2]

### Setup

- Setup billed: Yes [2]
- Billed setup per job: unknown (How long preparation and cleanup take is not published) [2]

### Platform

- CI systems: GitHub Actions [4]
- Hosting: Managed [4]
- Regions: unknown (Not on CI, pricing or docs pages; the subprocessor list names AWS (United States and other regions) and Google (United States) for infrastructure) [4]

### Free allowance

- Minutes a month: None [1]
- Credit a month: None [1]
- One-time credit: $5 [1]

### Cache

- Included: 25 GB [5]
- Extra storage: $0 per GB-month [5]
- Docker layer cache: No [5]
- Persistent disks: No [5]

### Features

- SSH debugging: unknown (CI docs describe no SSH access to a running or failed job computer) [2]
- Static IPs: unknown (Not on CI, pricing or docs pages) [2]
- GPU runners: No [2]
- SOC 2: unknown (No security or trust page (celesto.ai/security and /trust return 404); SOC 2 is not mentioned on CI, pricing or docs pages) [2]

### Prices

| Size | OS | Arch | vCPU | RAM | Disk | CPU | Plan | Price | Per minute |
|---|---|---|---|---|---|---|---|---|---|
| celesto-micro | Linux | x64 | 1 | 2 GB | 20 GB | unknown | any | $0.015 /h [3] | $0.00025 |
| celesto-small | Linux | x64 | 1 | 4 GB | 25 GB | unknown | any | $0.02 /h [3] | $0.000333 |
| celesto-standard | Linux | x64 | 2 | 4 GB | 30 GB | unknown | any | $0.03 /h [3] | $0.0005 |
| celesto-memory | Linux | x64 | 2 | 8 GB | 40 GB | unknown | any | $0.04 /h [3] | $0.000667 |
| celesto-large | Linux | x64 | 4 | 16 GB | 60 GB | unknown | any | $0.08 /h [3] | $0.00133 |
| celesto-xl | Linux | x64 | 8 | 32 GB | 100 GB | unknown | any | $0.16 /h [3] | $0.00267 |

- Every size runs a fresh Ubuntu 24.04 Linux x64 machine; Windows, macOS and ARM are not supported.
- A one-time $5 trial credit covers the Micro size only, needs no card and expires 30 days after activation; other sizes need paid workspace credit.
- Top-ups start at $2.01; paid credit allows up to 10 running sandboxes, subject to host capacity.
- Celesto serves the GitHub Actions cache at no extra charge (25 GiB per repository on paid credit, 5 GiB on trial); entries expire after 7 idle days.

## Celesto sandboxes (Agent sandboxes)

- Lowest price: $0.015 /h (micro (1 vCPU / 2 GB))
- 1-hour session: ≥ $0.03 (2 vCPU / 4 GB · rank 2 of 3)
- Billed on: Flat price per size (increment unknown)
- Isolation: unknown (max session unknown)

What to know:

- Prepaid: You buy credit up front. Whether unused credit expires is not published.
- Max 10 running: At most 10 sandboxes run at the same time.

### Billing

- Payment: Prepaid credit [1]
- Plan minimum: None [1]
- Billing increment: unknown (No rounding rule is published) [1]
- Minimum charge: unknown (Not published) [1]
- Per-job fee: None [1]
- Credit expires: unknown (Only trial credit is said to expire (30 days); the pricing page does not say whether paid credit expires) [1]
- Credit refundable: unknown (Not on the pricing page; the terms say fees are generally non-refundable in the subscriptions section, top-ups are not addressed) [1]

### Runtime

- Billed on: Flat price per size [1]
- Isolation: unknown (The hosted platform says microVM without naming the hypervisor) [1]
- Max session: unknown (Not published) [1]
- Concurrent sandboxes: 10 [1]

### Prices

| Size | vCPU | RAM | Price |
|---|---|---|---|
| micro | 1 | 2 GB | $0.015 /h [1] |
| small | 1 | 4 GB | $0.02 /h [1] |
| standard | 2 | 4 GB | $0.03 /h [1] |
| memory | 2 | 8 GB | $0.04 /h [1] |
| large | 4 | 16 GB | $0.08 /h [1] |
| xl | 8 | 32 GB | $0.16 /h [1] |

- Stopped sandboxes keep their disk free for 30 days.

## Sources

[1] https://celesto.ai/pricing (checked 31 Oct 2026)
[2] https://celesto.ai/docs/ci (checked 31 Oct 2026)
[3] https://celesto.ai/ci (checked 31 Oct 2026)
[4] https://celesto.ai/legal/subprocessors (checked 31 Oct 2026)
[5] https://celesto.ai/docs/ci/caching (checked 31 Oct 2026)