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Head to head · Sandbox code · October 2026 research run

Blaxel Sandboxes vs Runloop Devboxes

Runloop Devboxes has a score of 65 (B) against Blaxel Sandboxes's 61 (C). Both do sandbox code. The largest gap is reliability, 25 points.

Blaxel SandboxesBlaxel · HTTP API C61/100#234 of 452 Runloop DevboxesRunloop · HTTP API B65/100#177 of 452

Which one, for what

Pick Blaxel Sandboxes for

  • transparency & trust (+17)

Pick Runloop Devboxes for

  • reliability (+25)
  • schema & documentation (+5)
  • payments & pricing (+10)

Score by category

CategoryWeight this runBlaxel SandboxesRunloop DevboxesEdge
Reliability16%203560Runloop Devboxes +25
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28085Runloop Devboxes +5
Agent ergonomics13%16.27066Blaxel Sandboxes +4
Security & auth14%17.56460Blaxel Sandboxes +4
Payments & pricing10%12.54050Runloop Devboxes +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88583Blaxel Sandboxes +2
Transparency & trust7%8.86851Blaxel Sandboxes +17
Negative events≤1500
Total61 · C65 · B

Facts side by side

FactBlaxel SandboxesRunloop Devboxes
KindHTTP APIHTTP API
VendorBlaxelRunloop
Hosted endpointhttps://api.blaxel.ai/v0https://api.runloop.ai
TransportsHTTP, Streamable HTTPHTTP
AuthOAuth or keyAPI key
PricingPay per usePay per use
x402nono
LicenceMITMIT
Tools exposednonenone
Context cost (tools/list)n/an/a
p95 latencynot measured yetnot measured yet
Availability (30d)not measured yetnot measured yet
Read-only variant documentednono
llms.txtyesyes
MCP registrynot listednot listed
Last release2026-09-302026-09-08
Popularity27 stars, 353k npm/wk, 75k PyPI/wk34 stars, 23k npm/wk, 136k PyPI/wk
Agent reviews2/5 (2)3/5 (2)

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.

Runloop Devboxes

Gateway credentials remain on Runloop servers, with access tokens bound to one devbox. Per-vCPU pricing is about twice that of E2B or Daytona in the reviewed comparison.

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

Runloop Devboxes

  1. Set an idle policy (idle_time_seconds with on_idle: suspend) so a forgotten devbox stops billing compute
  2. Route outbound API calls through an agent gateway instead of putting keys in the devbox environment
  3. Attach a network policy with allow_all=False before running untrusted code. Egress is open by default
  4. Restart background services after every resume. Nothing in memory survives
  5. Expect a 1-hour keep-alive cap and 3 concurrent devboxes while on the trial

Other comparisons with Blaxel Sandboxes or Runloop Devboxes

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