CreateOS Sandbox vs Blaxel
Pick Blaxel if your agents sit idle for long stretches and you want them to cost only snapshot storage between turns, with resume in about 25 ms (vendor-stated). Pick CreateOS Sandbox if you need egress rules enforced outside the VM for every process, a fork you can use in production, or a shape with a stated vCPU count.
Pricing at a Glance
CreateOS rates verified 17 October 2026. Blaxel pricing as published on 17 October 2026. Rates billed per GB rather than per GiB, or as bundled sizes, are quoted as published rather than converted.
CreateOS Sandbox
- Compute
- $0.0362 /vCPU-hr
- Memory
- $0.0116 /GiB-hr
Blaxel
Blaxel bills active sandboxes per second at $0.0000115 per GB of RAM-second with CPU included, snapshot storage at $0.20 per GB-month and internet egress included, as of 17 October 2026.
Where CreateOS Sandbox Fits Better
What CreateOS Sandbox brings to this matchup, with a plain note on where Blaxel has the edge.
Egress rules are enforced on the host outside the VM, so they apply to every process. Blaxel's domain filtering is in public preview and relies on tools honouring HTTP(S)_PROXY.
Fork is a standard API call; Blaxel lists fork and snapshots as private preview, not recommended for production.
You pick a shape with a stated vCPU count, up to 8 vCPU; Blaxel allocates CPU from the memory size.
Blaxel lists a HIPAA BAA but no other attestations on the pages reviewed. CreateOS is SOC 2 Type II and ISO 27001 certified, with reports available under NDA.
Where Blaxel is strong
Blaxel's standby is built for agents that wait. Sandboxes snapshot memory and filesystem shortly after the last connection, cost only snapshot storage while idle, and come back with running processes in about 25 ms (vendor-stated). Standby can last indefinitely.
Which to Pick
Pick CreateOS Sandbox if
- You need outbound rules that hold even for tools that ignore proxy settings.
- You want to fork sandboxes in production today.
- Your buyers ask for SOC 2 Type II and ISO 27001 reports.
Pick Blaxel if
- Your sandboxes idle for minutes to days between turns and you want no compute charge while idle.
- You need up to 256 GB of RAM per sandbox on a Custom plan.
- You want a HIPAA BAA as a $250 per month add-on.
Head-to-Head Comparison
Every dimension side by side, checked on 17 October 2026 against each vendor's own docs and pricing pages. "Not published" means we could not find it on the vendor's pages, not that the feature is missing.
| Dimension | CreateOS Sandbox | Blaxel |
|---|---|---|
| Isolation | Firecracker micro-VM with its own guest kernel | Micro-VM per sandbox (vendor-stated); hypervisor not named |
| Pause and resume | Saves disk, memory and CPU state; vCPU billing stops, memory and storage still bill | Automatic standby about 15 s after the last connection, keeping memory and filesystem; can last indefinitely |
| Fork | Forks a paused sandbox into many independent copies | Private preview, not recommended for production |
| Outbound network default | Open with no rules; deny-by-default once any host, IP, CIDR or wildcard rule exists, enforced on the host outside the VM | Default not published; domain allow and deny lists in public preview via proxy; dedicated egress IPs |
| Inbound access | Closed by default; opt-in HTTPS URL | Preview URLs, public or private with a token; custom domains |
| Largest size | 8 vCPU / 16 GB on Enterprise; 8 vCPU / 8 GB on Pro | Sized by memory (8 GB gives 4 cores); up to 256 GB RAM on Custom; pay-as-you-go maximum not published |
| Concurrency | 1 / 5 / 20 / 30 by plan (Free to Enterprise); paused sandboxes count | 10 on Tier 0 up to 100,000+ on Tier 9, set by 30-day top-ups |
| Session length | No cap; optional idle auto-pause from 60 s to 24 h, off by default | No maximum lifetime published; optional TTL and idle expiry policies |
| Billing | Per second: $0.03616363/vCPU-hr, $0.01159025/GiB-hr, $0.0001584/GB-hr storage; no egress fees, 50 GiB bandwidth budget per sandbox | $0.0000115 per GB RAM-second while active, CPU included; internet egress included |
| SDKs and interfaces | TypeScript, Go, Python, Rust, C#, Java (all but TypeScript pre-1.0), CLI, MCP, REST | Python, TypeScript and Go SDKs, HTTP API, CLI, MCP server in every sandbox |
Common Questions
What does an idle Blaxel sandbox cost compared with a paused CreateOS sandbox?
An idle Blaxel sandbox in standby pays snapshot storage at $0.20 per GB-month, with no compute charge. A paused CreateOS sandbox stops vCPU billing, but memory and storage still bill. For agents that idle for days, Blaxel's standby is the cheaper model.
Are Blaxel egress controls enforced for every process?
Blaxel's domain filtering is in public preview and works through a proxy, so it covers tools that honour HTTP(S)_PROXY. CreateOS Sandbox enforces egress rules on the host outside the VM; once any rule exists, traffic to unlisted destinations is dropped whatever process sends it.
Can Blaxel fork a sandbox?
Blaxel offers snapshots, rollback and fork in private preview and says they are not recommended for production yet. CreateOS Sandbox forks a paused sandbox into any number of independent copies as a documented API call, with each child getting its own id and IP.
How does Blaxel size sandboxes?
Blaxel sizes by memory and allocates CPU from it, so 8 GB gets 4 cores and 16 GB gets 6. The Custom plan reaches 256 GB of RAM. CreateOS Sandbox uses fixed shapes up to 8 vCPU / 16 GB on Enterprise and 8 vCPU / 8 GB on Pro.
Sources
Checked 17 October 2026.
See CreateOS Sandbox for yourself
Book a demo, or explore the Sandbox and its pricing.