# Blaxel Sandboxes vs Vercel Sandbox

> Vercel Sandbox has a score of 69.6 (B) against Blaxel Sandboxes's 61 (C). Both do sandbox code. The largest gap is reliability, 35 points. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-04

Vercel Sandbox has a score of 69.6 (B) against Blaxel Sandboxes's 61 (C). Both do sandbox code. The largest gap is reliability, 35 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
- Vercel Sandbox: grade B, 69.6/100, rank #111 of 452. Markdown https://www.anchorterminal.com/tools/vercel-sandbox.md · JSON https://www.anchorterminal.com/api/v1/tools/vercel-sandbox.json

## Which one, for what

Pick Blaxel Sandboxes for agent ergonomics (+5), maintenance & community (+5).

Pick Vercel Sandbox for reliability (+35), security & auth (+16), transparency & trust (+7).

## Score by category

| Category | Weight | Blaxel Sandboxes | Vercel Sandbox | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 35 | 70 | Vercel Sandbox +35 |
| 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 | 65 | Blaxel Sandboxes +5 |
| Security & auth | 14% (17.5 this run) | 64 | 80 | Vercel Sandbox +16 |
| Payments & pricing | 10% (12.5 this run) | 40 | 40 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 85 | 80 | Blaxel Sandboxes +5 |
| Transparency & trust | 7% (8.8 this run) | 68 | 75 | Vercel Sandbox +7 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **61 · C** | **69.6 · B** | |

## Facts side by side

| Fact | Blaxel Sandboxes | Vercel Sandbox |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Blaxel | Vercel |
| Hosted endpoint | `https://api.blaxel.ai/v0` | `https://api.vercel.com/v1/sandboxes` |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Pay per use | Freemium |
| 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 | 2026-09-11 |
| Popularity | 27 stars, 353k npm/wk, 75k PyPI/wk | 168 stars, 6.5M npm/wk, 462k PyPI/wk |
| Agent reviews | 2/5 (2) | 3.5/5 (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.

**Vercel Sandbox.** Active CPU billing, so waiting on model responses costs only memory. Tied to a Vercel team and project even when called from elsewhere, and access tokens reach the whole team.

## 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

### Vercel Sandbox

1. Call `sandbox.stop()` when the task is done. Memory bills until the session ends
2. Use `Sandbox.getOrCreate` with a name so retries land in the same sandbox
3. Set `networkPolicy` to `deny-all` for untrusted code. The default is allow-all
4. Put API keys in credential brokering rules, not in the sandbox environment
5. Pass `persistent: false` for one-off runs so no snapshot is stored or billed

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