Both are open source security options with comparable terms, so the choice comes down to which model of the problem you prefer — compare the descriptions below rather than the licence.
AWS microVMs — a separate Linux kernel per sandbox, booting in about 125ms.
The default answer for running code a model wrote. Under 5 MiB overhead per VM, so per-task disposable sandboxes are affordable.
Firecracker sandboxes for running code the agent wrote, safely.
If the agent writes code that then runs, this layer is not optional.
| Firecracker | E2B | |
|---|---|---|
| Licence | Open source | Open source |
| Pricing | open source | freemium |
| Self-hostable | Yes | Yes |
| Languages | Any language | Python, TypeScript |
| Install | — | npm install @e2b/code-interpreter |
| Keys required | None | E2B_API_KEY |
| Job within the layer | sandbox | sandbox |
Both are open source security options with comparable terms, so the choice comes down to which model of the problem you prefer — compare the descriptions below rather than the licence. Firecracker: AWS microVMs — a separate Linux kernel per sandbox, booting in about 125ms. E2B: Firecracker sandboxes for running code the agent wrote, safely.
Firecracker can run on your own infrastructure. E2B can run on your own infrastructure.
Firecracker is open source (open source). E2B is open source (freemium).
Every page here answers to Accept: text/markdown and returns the same content at roughly a tenth the tokens. No separate site, no toggle — same URL.
curl -s -H "Accept: text/markdown" https://newagent.build/compare/firecracker-vs-e2b