Celesto

Name: Celesto
Brand: Celesto AI, Inc.

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. celesto.ai Status: active[1] Checked 31 Oct 2026

CI runners

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

Setup billedSetup and cleanup time is billed on every job; how long it takes is not published.
PrepaidYou buy credit up front. Whether unused credit expires is not published.
Max job 2 hA job is stopped after 2 h.
Max 10 jobsAt most 10 jobs run at the same time.

Celesto CI (runs-on self-hosted, celesto-SIZE): runner sizes and prices
Size	OS	Arch	vCPU	RAM	Disk	CPU	Price	Per minute
celesto-microLinux x64	Linux	x64	1	2 GB	20 GB	unknown	$0.015 /h[3]	$0.00025
celesto-smallLinux x64	Linux	x64	1	4 GB	25 GB	unknown	$0.02 /h[3]	$0.000333
celesto-standardLinux x64	Linux	x64	2	4 GB	30 GB	unknown	$0.03 /h[3]	$0.0005
celesto-memoryLinux x64	Linux	x64	2	8 GB	40 GB	unknown	$0.04 /h[3]	$0.000667
celesto-largeLinux x64	Linux	x64	4	16 GB	60 GB	unknown	$0.08 /h[3]	$0.00133
celesto-xlLinux x64	Linux	x64	8	32 GB	100 GB	unknown	$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.

Billing

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

Limits

Setup

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

Platform

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

Free allowance

Cache

Features

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

Agent sandboxes

Celesto sandboxes: prices per size
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]

Billing

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

Runtime

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

Raw data: JSON