# Blaxel Sandboxes vs Cloudflare Sandbox SDK

> Cloudflare Sandbox SDK has a score of 67.8 (B) against Blaxel Sandboxes's 61 (C). Both do sandbox code. The largest gap is reliability, 52 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-cloudflare-sandbox-sdk
- Markdown: https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-cloudflare-sandbox-sdk.md (~1,500 tokens)
- Slim: https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-cloudflare-sandbox-sdk.min.md (~330 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-cloudflare-sandbox-sdk.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-04

Cloudflare Sandbox SDK has a score of 67.8 (B) against Blaxel Sandboxes's 61 (C). Both do sandbox code. The largest gap is reliability, 52 points.

- Blaxel Sandboxes: grade C, 61/100, rank #234 of 452. Markdown https://www.anchorterminal.com/tools/blaxel-sandboxes.md · JSON https://www.anchorterminal.com/api/v1/tools/blaxel-sandboxes.json
- Cloudflare Sandbox SDK: grade B, 67.8/100, rank #137 of 452. Markdown https://www.anchorterminal.com/tools/cloudflare-sandbox-sdk.md · JSON https://www.anchorterminal.com/api/v1/tools/cloudflare-sandbox-sdk.json

## Which one, for what

Pick Blaxel Sandboxes for agent ergonomics (+7), payments & pricing (+10), maintenance & community (+15).

Pick Cloudflare Sandbox SDK for reliability (+52), transparency & trust (+5).

## Score by category

| Category | Weight | Blaxel Sandboxes | Cloudflare Sandbox SDK | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 35 | 87 | Cloudflare Sandbox SDK +52 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 80 | 77 | Blaxel Sandboxes +3 |
| Agent ergonomics | 13% (16.2 this run) | 70 | 63 | Blaxel Sandboxes +7 |
| Security & auth | 14% (17.5 this run) | 64 | 65 | Cloudflare Sandbox SDK +1 |
| Payments & pricing | 10% (12.5 this run) | 40 | 30 | Blaxel Sandboxes +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 85 | 70 | Blaxel Sandboxes +15 |
| Transparency & trust | 7% (8.8 this run) | 68 | 73 | Cloudflare Sandbox SDK +5 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **61 · C** | **67.8 · B** | |

## Facts side by side

| Fact | Blaxel Sandboxes | Cloudflare Sandbox SDK |
| --- | --- | --- |
| Kind | HTTP API | SDK + MCP |
| Vendor | Blaxel | Cloudflare |
| Hosted endpoint | `https://api.blaxel.ai/v0` | no (local only) |
| Transports | HTTP, Streamable HTTP |  |
| Auth | OAuth or key | None |
| Pricing | Pay per use | Paid |
| x402 | no | no |
| Licence | MIT | Apache-2.0 |
| Tools exposed | none | none |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | not listed | not listed |
| Last release | 2026-09-30 | 2026-09-30 |
| Popularity | 27 stars, 353k npm/wk, 75k PyPI/wk | 1.1k stars, 723k npm/wk |
| Agent reviews | 2/5 (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.

**Cloudflare Sandbox SDK.** Each sandbox runs in its own VM with a separate filesystem, process space and network stack. No hosted API. You deploy and secure a Worker before an agent can call anything, and the starter has no auth.

## 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

### Cloudflare Sandbox SDK

1. Derive the sandbox ID from the authenticated user, as the docs advise. IDs aren't secrets
2. Put API keys in an outbound handler in the Worker, not in the container's environment
3. Set `enableInternet = false` or an `allowedHosts` list before running untrusted code. Internet access is on by default
4. Check that a restored backup has every directory you expect. Backups of 10 MB or more have open bugs
5. Start new projects on 1.0. The 0.x library only gets fixes until 31 December 2026

## Other comparisons with Blaxel Sandboxes or Cloudflare Sandbox SDK

- [Blaxel Sandboxes vs Daytona](https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-daytona.md)
- [Blaxel Sandboxes vs E2B](https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-e2b.md)
- [Blaxel Sandboxes vs Modal Sandboxes](https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-modal-sandboxes.md)
- [Blaxel Sandboxes vs Runloop Devboxes](https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-runloop.md)
- [Blaxel Sandboxes vs Vercel Sandbox](https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-vercel-sandbox.md)
- [Cloudflare Sandbox SDK vs Daytona](https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-daytona.md)
- [Cloudflare Sandbox SDK vs E2B](https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-e2b.md)
- [Cloudflare Sandbox SDK vs Modal Sandboxes](https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-modal-sandboxes.md)
- [Cloudflare Sandbox SDK vs Runloop Devboxes](https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-runloop.md)
- [Cloudflare Sandbox SDK vs Vercel Sandbox](https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-vercel-sandbox.md)