Comparison
Secure runtime for code-mode agents: Submilli vs Daytona
Daytona provides programmable sandbox computers for running code. Submilli is for code-mode agents whose business operations need semantic permissions.
A practical comparison
Product details are current as of November 3, 2026. Rows appear only where the cited public sources establish a comparison.
| Area | Submilli | Daytona |
|---|---|---|
| What it is | A runtime for executing agent-written programs under explicit rules. | Programmable sandbox computers for running AI-generated code. |
| Isolation model | One WebAssembly sandbox for each program, with its own files and limits. | Linux containers are the default and share the host kernel; Linux VM sandboxes have their own kernel. |
| Where it runs | Runtime: self-hosted. Hosted cloud: operated by Submilli. Enterprise: your cloud. | Daytona-managed shared regions or a customer-provided custom region through BYOC; Daytona retains the control plane. |
| Pricing | Hosted cloud: freemium, usage-based. Enterprise: From $5,000/year, including BYOC and forward-deployed engineers. | Pay as you go for reserved sandbox vCPU, RAM, and disk. |
| Best fit | Code-mode agents that need permissions checked outside the model. | Agents that need a configurable computer, including language runtimes, processes, servers, or GPU workloads. |
Secure runtime for code-mode agents. Runtime is free, open source, and Apache-2.0. Hosted cloud is freemium and usage-based. Enterprise: From $5,000/year, including BYOC and forward-deployed engineers.
When to choose Daytona
Choose Daytona when your agent needs a complete Linux, Windows, macOS, or GPU environment to run, build, or test code.
When to choose Submilli
Choose Submilli when you need a runtime that checks the operation, resource, and arguments before a covered call proceeds.
Runs are durable: after a restart they resume where they left off, without repeating finished steps.
Sources
Last checked .