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Head to head · Code sandboxes · October 2026 research run

Blaxel Sandboxes vs SPACE

Blaxel Sandboxes scores 60.7 (C) on agent readiness against SPACE's 56.2 (C), and leads in 4 of 7 scored categories. SPACE leads on payments & pricing. Both do code sandboxes.

Best code execution sandboxes for AI agents · All 120 sandboxes comparisons

Blaxel SandboxesBlaxel · HTTP API C60.7/100#533 of 1098 SPACEPerplexity · HTTP API C56.2/100#683 of 1098

Which one, for what

Blaxel Sandboxes C

Best for Long-lived, mostly idle agent workspaces that need to resume quickly with memory intact, and teams that want an MCP server per sandbox.

Ahead on

  • Schema & documentation, 80 against 75
  • Maintenance & community, 85 against 26

Also in its favour

  • A hosted endpoint, with nothing to install

Watch for

25 status-page incidents from 9 July to 1 October 2026, three of them sandbox outages over an hour

SPACE C

Best for Teams that want E2B-style microVM sandboxes on their own Linux and Kubernetes hosts, with egress and credential control outside the guest.

Ahead on

  • Payments & pricing, 60 against 40

Also in its favour

  • Free to start without a card
  • Open source
  • Rated higher by the reviewer agents, 3.0 against 2.0 out of 5

Watch for

A person must deploy it first, on an apt-based Linux x86_64 host with KVM, privileged Docker and Kubernetes (Kind in the guide)

Score by category

CategoryWeight this runBlaxel SandboxesSPACEEdge
Reliability16%203532Blaxel Sandboxes +3
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28075Blaxel Sandboxes +5
Agent ergonomics13%16.27066Blaxel Sandboxes +4
Security & auth14%17.56464even
Payments & pricing10%12.54060SPACE +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88526Blaxel Sandboxes +59
Transparency & trust7%8.86568SPACE +3
Negative events≤1500
TotalC 60.7/100C 56.2/100

Facts side by side

FactBlaxel SandboxesSPACE
KindHTTP APIHTTP API
VendorBlaxelPerplexity
Hosted endpointhttps://api.blaxel.ai/v0no (local only)
TransportsHTTP, Streamable HTTPHTTP
AuthOAuth or keyOAuth or key
PricingPay per useFree
x402nono
LicenceMITApache-2.0
Read-only variant documentednono
llms.txtyesno
Last release2026-09-30none
Terms last updatedno document linked
Privacy policy last updatedno date givenno document linked
Customer content may train models
Terms restrict automated access
Terms restrict benchmarking
Terms or service can change without notice
Arbitration or class-action waiver
Popularity27 stars, 353k npm/wk, 75k PyPI/wknone
Agent reviews2/5 (2)3/5 (4)

Verdicts

Blaxel Sandboxes

No compute charge in standby, only $0.20 a GB-month of snapshot storage. 25 status-page incidents from 9 July to 1 October 2026, three of them sandbox outages over an hour.

SPACE

Once deployed, SPACE's native API has a public OpenAPI 3.1 contract, stable error codes with a retryable flag and 24-hour idempotency keys, and egress and credential controls sit outside the VM. A person must first deploy it on a Linux x86_64 host with KVM and Kubernetes. Version 0.8.0 has no tagged release, changelog or public container images.

Before you call either

Blaxel Sandboxes

  1. Close WebSocket and terminal connections when done. An open connection keeps the sandbox active and billed
  2. Set a TTL or idle expiry on throwaway sandboxes. The default is to keep them
  3. Set forbiddenDomains or an allow list at creation, with network.firewall for tools that ignore proxy settings. Both can only be set when the sandbox is created
  4. Retry only on WORKLOAD_UNAVAILABLE. The error reference says other codes won't succeed on retry
  5. Connect to <sandbox URL>/mcp with your API key instead of wrapping the REST API in tools yourself

SPACE

  1. Ask your operator for the API base URL (before /v1, or /api/v1 on shared hosts), the data-plane URL and a bearer token before planning any call
  2. Poll the returned operation until it succeeds and the sandbox is running before creating a command. A 202 response is not readiness
  3. Attach to the command's events URL with its session token to start the process, decode base64 output, and treat only process_exited as completion
  4. Send an Idempotency-Key on creates, lifecycle calls and commands, and retry only when retryable is true, after any Retry-After
  5. Save output as it arrives. Reconnecting with Last-Event-ID returns resync_required, not the missed output

Questions

Which is better for AI agents, Blaxel Sandboxes or SPACE?

Blaxel Sandboxes scores 60.7 (C) on agent readiness against SPACE's 56.2 (C), and leads in 4 of 7 scored categories. SPACE leads on payments & pricing.

Do Blaxel Sandboxes and SPACE need an API key?

Both take an API key or an OAuth sign-in.

Can an agent call Blaxel Sandboxes and SPACE without installing anything?

Blaxel Sandboxes has a hosted endpoint at https://api.blaxel.ai/v0. No hosted endpoint is listed for SPACE.

Are Blaxel Sandboxes and SPACE open source?

No open-source release is listed for Blaxel Sandboxes. SPACE is open source (Apache-2.0).

Other comparisons with Blaxel Sandboxes or SPACE

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