Blaxel runs sandboxes as microVMs for agent workloads, alongside agent hosting, MCP servers, batch jobs and a model gateway.

Baseten acquired Blaxel on 10 September 2026. The announcement says the product continues and features keep shipping, and Baseten sign-in now connects to a Blaxel workspace.

At a glance

Who it is forTeams building agent platforms that want instant sandboxes, a built-in MCP surface and optional agent hosting.
IsolationMicroVM boundary per sandbox, root by default with an optional unprivileged user. The default kernel refuses module loading and kernel tracing to every process, including root; iptables requires enabling at creation.
SizesMemory drives CPU: 8 GB gets 4 cores and 16 GB gets 6. Custom deployments advertise up to 256 GB of RAM. Regions: Oregon, North Virginia, London and Frankfurt.
A personal agent hereAbout $123.29 a month for one always-on 2 vCPU / 4 GiB machine (2 vCPU / 4 GiB / 20 GiB), before the AI model. Change the numbers
Recommended inNot one of the picks in any use-case guide.

Fits well, fits badly

Our reading of the sourced material on this page, not a provider claim.

Fits well

  • A sandbox that must resume in milliseconds: standby preserves process state and resume is claimed under 25 ms.
  • Secrets that should never sit in the machine: the proxy injects headers, body fields and secrets server-side.
  • A team that wants SDKs in three languages, a console and a per-sandbox MCP server.

Fits badly

  • A buyer who needs the contracting entity settled now: the terms still name Blaxel, not Baseten.
  • A workload that needs kernel modules or iptables without opting in at creation.
  • Production dependence on snapshots, which are in private preview.

How it bills

ModelPay-as-you-go against a wallet, with quota tiers set by top-up.
Meter$0.0000115 per GB of allocated RAM per second while active; CPU is included in that rate. Snapshot storage $0.20 per GB-month and volumes $0.12 per GB-month.
While stoppedStandby stops memory charges but keeps billing snapshot and volume storage.
Plan feeNo subscription: tiers are wallet top-ups ($0, $20, $50) that raise quotas.
MinimumNo published minimum billed duration. Up to $200 in promotional credits is advertised; the actual grant is not published.

How Blaxel lets you try before paying is on Trials and free tiers.

Where it stands out

  • Standby preserves memory and processes, with a sub-25 ms resume claim.
  • Every sandbox exposes an MCP server for files, processes, ports and previews.
  • A secret proxy injects credentials into outbound HTTPS requests.
  • Agent Drive offers a shared filesystem across sandboxes.
  • Snapshots can outlive the sandbox and be forked.

Using it without writing code

DashboardA console creates a sandbox by choosing an image, resources, TTL and region, with a browser terminal.
Without codeThe console can create and inspect a sandbox, but useful work still needs commands or a developer.
SignupBaseten or Blaxel sign-in. Card requirement and credit expiry are not published.
Docs and supportDocumentation covers sandboxes, snapshots, volumes, MCP and SSO. A status page is linked from the site. Support is Discord community plus paid tiers.

Capability checklist

Every capability the guide checks, with the catch where Blaxel's version falls short. Compare all providers

The company

From the profile's company section: the legal entity, who funds it, and what a buyer can check before signing.

Legal entity

Blaxel, Inc. (formerly Beamlit, Inc.), a Delaware corporation.

“Blaxel, Inc (formerly known as Beamlit, Inc.), a Delaware corporation, d/b/a Blaxel” blaxel.ai docs-confirmed

Ownership

Acquired by Baseten on 10 September 2026. The linked terms predate the deal and still name Blaxel.

“Baseten has acquired Blaxel.” baseten.co docs-confirmed

Founded and funded

2024, by six founders including CEO Paul Sinaï. A $7.3M seed led by First Round.

“Blaxel raised a $7.3M seed round led by First Round.” blaxel.ai docs-confirmed

Headcount

12, per Y Combinator's directory. The figure is undated and not a post-acquisition count.

“Team Size:12” ycombinator.com third-party

Status and SLA

Sandboxes 99.33% over July–October 2026. Custom SLAs only; no standard uptime commitment published.

“99.33% uptime” status.blaxel.ai docs-confirmed

Certification

SOC 2, HIPAA and ISO 27001 claimed; the full SOC 2 report is on request through its compliance portal.

“SOC 2, HIPAA, ISO 27001” blaxel.ai docs-confirmed

Caveats and contradictions

Shown as the research found them. A contradiction means the provider's own pages disagree; an open question means the answer is not published.

  1. 01

    Idle timing is stated two ways Contradiction

    The docs say a sandbox goes to standby after 15 minutes of idle WebSocket/TCP activity; the pricing FAQ says it scales to zero after about 5 seconds.

    “if the WebSocket/TCP connection remains idle for 15 minutes with no activity, the sandbox will automatically transition to standby mode.”
    Blaxeldocs-confirmed
    “Sandboxes scale to zero after about 5 seconds of inactivity and resume from standby in roughly 25ms”
    Blaxelpricing-page
  2. 02

    Snapshots and archive are private previews Open question

    The snapshot docs say the feature is in private preview and not recommended for production; archive is also preview.

  3. 03

    Ownership changed in September 2026 Open question

    Baseten acquired Blaxel on 10 September 2026. The product continues, but a permanent standalone guarantee is not published.

  4. 04

    Low tiers delete sandboxes on a timer Open question

    Tier 0 and Tier 1 enforce expiration dates of up to 7 and 30 days; activity is counted at resume or suspend, not in between.

  5. 05

    Volume and shared-filesystem semantics differ Open question

    A volume attaches to one sandbox at a time; Agent Drive is the multi-mount shared filesystem, and the two are separate products.

Sources

The three shared workloads

List-price illustrations from the calculator, not quotes. Prices checked 29 October 2026.

A · 1,000 short tasks

$27.60

2 vCPU / 4 GiB / 10 GiB (plan: Pay as you go)

  • Memory166.67 h × 4 GiB × $0.0414$27.60
  • Standby keeps a snapshot, billed at $0.20 per GB-month; its size is not published, so it is not added.
  • Up to $200 of promotional credit is advertised; the actual grant is not published.

B · One always-on box

$247.78

4 vCPU / 8 GiB / 50 GiB (plan: Pay as you go)

  • Memory730 h × 8 GiB × $0.0414$241.78
  • Kept disk (volume)1 × 50 GiB × $0.12 a month$6.00
  • Standby keeps a snapshot, billed at $0.20 per GB-month; its size is not published, so it is not added.
  • Up to $200 of promotional credit is advertised; the actual grant is not published.

C · Three hours a day

$17.30

2 vCPU / 4 GiB / 20 GiB (plan: Pay as you go)

  • Memory90 h × 4 GiB × $0.0414$14.90
  • Kept disk (volume)1 × 20 GiB × $0.12 a month$2.40
  • Standby keeps a snapshot, billed at $0.20 per GB-month; its size is not published, so it is not added.
  • Up to $200 of promotional credit is advertised; the actual grant is not published.