Curated Buying Guide · prices verified 2026-08-25
Hundreds of Parallel Sandboxes Without the Bill Exploding
Parallel agents multiply everything: 50 workers × 100 hr/mo each = 5,000 sandbox-hours. This guide ranks vendors at fleet scale — where the fixed-cost self-host row stops being a curiosity and becomes the outright price winner.
🏆 Recommendations for This Workload
Editorial picks — curated by us for this workload. The full computed table (all priced vendors) follows below.
A CPX62 host (16 vCPU / 32 GiB) carries ~8 concurrent reference sandboxes for a flat $153.59/mo — the computed table's #1 at this volume, with zero meter running.
$333.30/mo computed at 5,000 hr — 2.2× the self-host bill, but with elastic scale beyond one host's capacity.
$828.00/mo computed; Pro allows ≤100 concurrent sandboxes (extensible to 1,100) — plan caps before rates.
Computed Monthly Cost at This Guide's Workload
Workload: 5,000 sandbox-hrs/mo · 2 vCPU per sandbox · 4 GiB RAM per sandbox
| Rank | Vendor | $/vCPU-hr | $/GiB-hr | Computed Monthly Bill | × cheapest |
|---|---|---|---|---|---|
| 4 | E2B | $0.0504 | $0.0162 | $828.00/mo | 5.40× |
| 3 | Daytona | $0.0504 | $0.0162 | $828.00/mo | 5.40× |
| 6 | Beam (sandbox) | $0.0675 | $0.0230 | $1,135.80/mo | 7.40× |
| 7 | Modal (Sandboxes) | $0.0710 | $0.0240 | $1,190.00/mo | 7.70× |
| 8 | Runloop | $0.1080 | $0.0252 | $1,584.00/mo | 10.30× |
| 1 | Self-host Firecracker (Hetzner) | — | incl. | $153.59/mo | cheapest |
| 5 | Cloudflare Containers | $0.0720 | $0.0090 | $900.00/mo | 5.90× |
| 2 | Northflank | $0.0167 | $0.0083 | $333.30/mo | 2.20× |
💡 Key Takeaways
- Metered two-axis pricing is linear in hours, so managed rankings never change with scale — but the fixed-cost host overtakes everything past its ~925 hr/mo break-even.
- One CPX62 fits min(16/2 vCPU, 32/4 GiB) = 8 concurrent sandboxes at the reference profile; fleets beyond that need multiple hosts or a managed platform.
- Concurrency limits are the real ceiling on managed plans: check each vendor's self-serve cap against peak parallelism before comparing rates.
⚠️ Gotchas & Hidden Costs
- Self-hosting trades ops labor (host setup, image pipeline, patching) for the margin — excluded from the $153.59 honestly, so budget it separately.
- E2B Hobby caps at ≤20 concurrent sandboxes — fleets need Pro from day one.
Fine-Tune for Your Exact Workload
Adjust sandbox-hours and the vCPU/RAM profile in the full interactive calculator.
Customize This Workload in Calculator →