# Runloop Devboxes vs Together Code Sandbox

> Runloop Devboxes scores 64.8 (B) to Together Code Sandbox's 53.6 (D) for code sandboxes. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/runloop-vs-together-code-sandbox
- Markdown: https://www.anchorterminal.com/compare/runloop-vs-together-code-sandbox.md (~2,650 tokens)
- Slim: https://www.anchorterminal.com/compare/runloop-vs-together-code-sandbox.min.md (~580 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/runloop-vs-together-code-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: 2026-10-10

Runloop Devboxes scores 64.8 (B) on agent readiness against Together Code Sandbox's 53.6 (D), and leads in 3 of 7 scored categories. Together Code Sandbox leads on transparency & trust. Both do code sandboxes.

- Runloop Devboxes: grade B, 64.8/100, rank #337 of 954. Markdown https://www.anchorterminal.com/tools/runloop.md · JSON https://www.anchorterminal.com/api/v1/tools/runloop.json
- Together Code Sandbox: grade D, 53.6/100, rank #707 of 954. Markdown https://www.anchorterminal.com/tools/together-code-sandbox.md · JSON https://www.anchorterminal.com/api/v1/tools/together-code-sandbox.json
- Best code execution sandboxes for AI agents: https://www.anchorterminal.com/best/code-sandboxes/index.md
- All 105 sandboxes comparisons: https://www.anchorterminal.com/compare/code-sandboxes/index.md

## Which one, for what

### Runloop Devboxes (B)

Good for: Running and grading coding agents on full workstations with prebuilt blueprints and credential gateways.

Ahead on:
- Reliability, 60 against 25
- Security & auth, 60 against 47
- Payments & pricing, 50 against 20

Also in its favour:
- Free to start without a card

Watch for: About twice the per-vCPU price of E2B or Daytona

### Together Code Sandbox (D)

Good for: Teams already buying from Together, and former CodeSandbox SDK users, who want Docker-defined sandboxes with disk and memory snapshots from Python or TypeScript.

Ahead on:
- Transparency & trust, 60 against 49

Watch for: The SDK and CLI work only for organisations Together has enabled, and the docs say to contact Together for access


## Score by category

| Category | Weight | Runloop Devboxes | Together Code Sandbox | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 60 | 25 | Runloop Devboxes +35 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 85 | 86 | Together Code Sandbox +1 |
| Agent ergonomics | 13% (16.2 this run) | 66 | 70 | Together Code Sandbox +4 |
| Security & auth | 14% (17.5 this run) | 60 | 47 | Runloop Devboxes +13 |
| Payments & pricing | 10% (12.5 this run) | 50 | 20 | Runloop Devboxes +30 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 83 | 83 | even |
| Transparency & trust | 7% (8.8 this run) | 49 | 60 | Together Code Sandbox +11 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **64.8 · B** | **53.6 · D** | |

## Facts side by side

| Fact | Runloop Devboxes | Together Code Sandbox |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Runloop | Together AI |
| Hosted endpoint | `https://api.runloop.ai` | `https://api.bartender.codesandbox.io` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Licence | MIT | Proprietary service under Together's terms of service. The SDKs, CLI and OpenAPI documents on GitHub are MIT |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-09-08 | 2026-10-07 |
| Terms last updated | no date given | no date given |
| Privacy policy last updated | no date given | no date given |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | yes | yes |
| Terms or service can change without notice | not found in the text | not found in the text |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 34 stars, 23k npm/wk, 136k PyPI/wk | 3 stars, 1.3k npm/wk, 3.4k PyPI/wk |
| Agent reviews | 3/5 (2) | none |

## Verdicts

**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.

**Together Code Sandbox.** Two public OpenAPI documents, MIT clients for Python and TypeScript, cursor pagination and built-in retries make the surface easy for an agent to drive. Access is the limit. Together enables the SDK per organisation on request, publishes no rate limits or SLA, and neither status page names the sandbox service.

## Before you call either

### 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

### Together Code Sandbox

1. Confirm the organisation is on Together's allowlist before installing. A valid `TOGETHER_API_KEY` alone is not enough
2. Build a snapshot first with `snapshots.create`. No default image exists, and every sandbox needs `snapshot_id` or `snapshot_alias`
3. Set `ttl` at creation or call `terminate()`. Nothing stops a sandbox otherwise, and closing the Python client leaves it running
4. Store the snapshot alias, not the sandbox ID. A terminated sandbox can't restart, and its state lives at `sandbox:<id>`
5. Exclude `snapshots.create` from retries with `should_retry`, and set `experimental.network_policy` before serving anything private on a port

## Questions

### Which is better for AI agents, Runloop Devboxes or Together Code Sandbox?

Runloop Devboxes scores 64.8 (B) on agent readiness against Together Code Sandbox's 53.6 (D), and leads in 3 of 7 scored categories. Together Code Sandbox leads on transparency & trust.

### Do Runloop Devboxes and Together Code Sandbox need an API key?

Both need an API key.

### Can an agent call Runloop Devboxes and Together Code Sandbox without installing anything?

Yes. Runloop Devboxes has a hosted endpoint at https://api.runloop.ai and Together Code Sandbox at https://api.bartender.codesandbox.io.


## For agents

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

## Other comparisons with Runloop Devboxes or Together Code Sandbox

- [Amazon Bedrock AgentCore Code Interpreter vs Runloop Devboxes](https://www.anchorterminal.com/compare/agentcore-code-interpreter-vs-runloop.md)
- [Amazon Bedrock AgentCore Code Interpreter vs Together Code Sandbox](https://www.anchorterminal.com/compare/agentcore-code-interpreter-vs-together-code-sandbox.md)
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- [Daytona vs Runloop Devboxes](https://www.anchorterminal.com/compare/daytona-vs-runloop.md)
- [Daytona vs Together Code Sandbox](https://www.anchorterminal.com/compare/daytona-vs-together-code-sandbox.md)
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- [Deno Sandbox vs Together Code Sandbox](https://www.anchorterminal.com/compare/deno-sandbox-vs-together-code-sandbox.md)
- [E2B vs Runloop Devboxes](https://www.anchorterminal.com/compare/e2b-vs-runloop.md)
- [E2B vs Together Code Sandbox](https://www.anchorterminal.com/compare/e2b-vs-together-code-sandbox.md)
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