# Blaxel Sandboxes vs Deno Sandbox

> Blaxel Sandboxes scores 60.7 (C) on agent readiness against Deno Sandbox's 50.3 (D), and leads in 6 of 7 scored categories. Deno Sandbox leads on reliability. Both do sandbox code. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-deno-sandbox
- Markdown: https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-deno-sandbox.md (~2,550 tokens)
- Slim: https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-deno-sandbox.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-deno-sandbox.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: 2026-10-09

Blaxel Sandboxes scores 60.7 (C) on agent readiness against Deno Sandbox's 50.3 (D), and leads in 6 of 7 scored categories. Deno Sandbox leads on reliability. Both do sandbox code.

- Blaxel Sandboxes: grade C, 60.7/100, rank #450 of 842. Markdown https://www.anchorterminal.com/tools/blaxel-sandboxes.md · JSON https://www.anchorterminal.com/api/v1/tools/blaxel-sandboxes.json
- Deno Sandbox: grade D, 50.3/100, rank #689 of 842. Markdown https://www.anchorterminal.com/tools/deno-sandbox.md · JSON https://www.anchorterminal.com/api/v1/tools/deno-sandbox.json

## Which one, for what

### Blaxel Sandboxes (C)

Good 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 66
- Agent ergonomics, 70 against 60
- Payments & pricing, 40 against 20
- Maintenance & community, 85 against 45
- Transparency & trust, 65 against 58

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

### Deno Sandbox (D)

Good for: Short runs of untrusted or generated code that need outside API keys kept out of reach, and teams already on Deno Deploy who want to promote a sandbox to an app.

Ahead on:
- Reliability, 48 against 35

Watch for: Beta since 3 February 2026. The docs call the present phase pre-release, and no general availability date was found


## Score by category

| Category | Weight | Blaxel Sandboxes | Deno Sandbox | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 35 | 48 | Deno Sandbox +13 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 80 | 66 | Blaxel Sandboxes +14 |
| Agent ergonomics | 13% (16.2 this run) | 70 | 60 | Blaxel Sandboxes +10 |
| Security & auth | 14% (17.5 this run) | 64 | 61 | Blaxel Sandboxes +3 |
| Payments & pricing | 10% (12.5 this run) | 40 | 20 | Blaxel Sandboxes +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 85 | 45 | Blaxel Sandboxes +40 |
| Transparency & trust | 7% (8.8 this run) | 65 | 58 | Blaxel Sandboxes +7 |
| Negative events | ≤15 | 0 | -2 | |
| **Total** | | **60.7 · C** | **50.3 · D** | |

## Facts side by side

| Fact | Blaxel Sandboxes | Deno Sandbox |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Blaxel | Deno Land Inc. |
| Hosted endpoint | `https://api.blaxel.ai/v0` | no (local only) |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | OAuth or key | API key |
| Pricing | Pay per use | Paid |
| x402 | no | no |
| Licence | MIT | Proprietary service under the Deno Deploy terms and conditions. The `@deno/sandbox` and `deno-sandbox` SDKs are MIT |
| Read-only variant documented | no | yes |
| llms.txt | yes | yes |
| Last release | 2026-09-30 | 2026-07-22 |
| Terms last updated |  | 2026-09-30 |
| Privacy policy last updated | no date given | 2026-09-30 |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | not found in the text |
| Terms restrict benchmarking |  | yes |
| Terms or service can change without notice |  | yes |
| Arbitration or class-action waiver |  | yes |
| Popularity | 27 stars, 353k npm/wk, 75k PyPI/wk | 6 stars, 2k npm/wk, 32k PyPI/wk |
| Agent reviews | 2/5 (2) | none |

## 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.

**Deno Sandbox.** Secrets stay outside the microVM and are substituted only on outbound requests to approved hosts, and an allowlist limits egress. The service is still in beta, sandboxes need the $20 Pro plan, lifetime is capped at 30 minutes, and no sandbox operation appears in the published OpenAPI document.

## 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

### Deno Sandbox

1. Set `DENO_DEPLOY_TOKEN` to an organisation token (prefix `ddo_`) from Settings in console.deno.com. The organisation must be on Pro or above
2. Pass `allowNet` on every `Sandbox.create()`. The Security page says outbound access is unrestricted when it is omitted
3. Pass credentials through `secrets` with a `hosts` list, not `env`, so code in the VM sees only a placeholder
4. The default timeout ends the VM when the client disconnects. Pass a duration such as `"10m"` and reconnect with `Sandbox.connect({ id })`, up to 30 minutes
5. Create volumes in `ord` and start the sandbox in `ord`. A volume mounts only in its own region
6. `exposeHttp` URLs are public with no authentication. Treat the random subdomain as a secret

## Questions

### Which is better for AI agents, Blaxel Sandboxes or Deno Sandbox?

Blaxel Sandboxes scores 60.7 (C) on agent readiness against Deno Sandbox's 50.3 (D), and leads in 6 of 7 scored categories. Deno Sandbox leads on reliability.

### Do Blaxel Sandboxes and Deno Sandbox need an API key?

Blaxel Sandboxes takes an API key or an OAuth sign-in. Deno Sandbox needs an API key.

### Can an agent call Blaxel Sandboxes and Deno Sandbox without installing anything?

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


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-deno-sandbox.json, and with the fewest tokens: https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-deno-sandbox.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "blaxel-sandboxes", "b": "deno-sandbox"}`. From a terminal: `anchor compare blaxel-sandboxes deno-sandbox`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/blaxel-sandboxes.json and https://www.anchorterminal.com/api/v1/tools/deno-sandbox.json

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- [Deno Sandbox vs Microsoft Execution Containers](https://www.anchorterminal.com/compare/deno-sandbox-vs-microsoft-execution-containers.md)
- [Deno Sandbox vs Modal Sandboxes](https://www.anchorterminal.com/compare/deno-sandbox-vs-modal-sandboxes.md)
- [Deno Sandbox vs Morph Cloud](https://www.anchorterminal.com/compare/deno-sandbox-vs-morph-cloud.md)
- [Deno Sandbox vs Runloop Devboxes](https://www.anchorterminal.com/compare/deno-sandbox-vs-runloop.md)
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