Compare · Agent sandboxes · verified 17 Oct 2026

E2B vs Cloudflare Sandbox

Both run each sandbox in a Firecracker microVM. E2B is a sandbox SDK on its own; Cloudflare's is driven from a Worker on the Workers Paid plan.

Facts checked 17 October 2026. Prices and limits move. Read the citations.

Start a TaskAll comparison pages
Vendor agentDevin · Cursor · Copilot · Julessame jobRushYour harness, isolated, one PR
Isolated sandbox rooms, one per run

Neither product is ours. Rush is, and it gets one paragraph below. Every cell is from the vendor's own pages.

The short answer

Pick E2B for a standalone sandbox SDK with pause and resume and self-hosting. Pick Cloudflare Sandbox when your code already runs on Workers.

Read this first

The useful distinction

E2B: Firecracker microVM sandboxes driven from an SDK. Your agent runs code there; the loop, the git steps and the pull request are your code. Rush itself runs on E2B.

Cloudflare Sandbox: Linux microVM containers, or isolated Dynamic Workers, started from a Worker to run untrusted or agent-generated code. You build the agent loop.

Head to head

Buyer questions

QuestionE2BCloudflare Sandbox
What runsNone built in. You bring the agent; E2B ships a prebuilt claude template and guides for Codex and OpenCode.None built in. Cloudflare's docs show Claude Code, Codex and Devin running in a sandbox that belongs to one task.
IsolationFirecracker microVMs with dedicated kernels. A paused sandbox keeps its filesystem and memory, with no automatic deletion.Each container is a Firecracker microVM with its own kernel and network. Largest instance is 4 vCPU, 12 GiB and 20 GB disk. The container must start before the first command.
Result and pull requestLeft to you. E2B's Claude Code guide clones with your token, runs the agent and reads git diff; pushing and opening the pull request is your code.Left to you. Cloudflare's coding agent runner tutorial clones a repository, runs Claude Code and returns a diff, with the instruction not to commit.
MCPAn MCP gateway inside the sandbox reaches 200+ servers from Docker's catalog, or servers you run yourself.Cloudflare runs a managed remote Container MCP server that spins up a sandbox development environment.
TeamAn SDK for your own product. No shared task view or Slack and Linear surface on the pages we read.The Cloudflare account and Workers model. No sandbox-specific sharing on the pages we read.
Starting priceHobby $0 with a one-time $100 credit; Pro $150 / month plus usageWorkers Paid $5 / month, with 375 vCPU-minutes and 25 GiB-hours included
Where it taps outSessions end at 1 hour on Hobby and 24 hours on Pro unless paused. Sandboxes reach the open internet by default. No result or pull request layer. Pro has a $150 monthly fee before usage.Needs Workers Paid and a Worker and Durable Object around each sandbox. Largest instance is 4 vCPU and 12 GiB. The tutorial ends at a diff, with no pull request or proof.

Decision

When each side wins

E2B wins when

  • You want raw SDK control over each sandbox, for an agent you wrote or for work that is not an agent at all.
  • You must self-host: the runtime is Apache-2.0, runs on one KVM host or ships as Terraform for AWS, GCP and Azure, and E2B also offers BYOC.
  • You want published per-second rates for CPU and RAM and up to 1,100 concurrent sandboxes on its top published tier.

Cloudflare Sandbox wins when

  • You want very small instances (from 1/16 vCPU) billed per second, placed on Cloudflare's network.
  • You want Dynamic Workers isolates for cheap code execution.
  • Your app already lives on Workers, R2 and Durable Objects.

Rush

Where Rush sits

Rush runs on E2B and returns what the coding agent runner tutorials on both leave out: the commit, the pull request and the checks.

Honest limits

Skip Rush if

  • Rush runs three agents: Claude Code, Codex and OpenCode. It does not host an agent you wrote yourself.
  • Repositories come through the Rush GitHub App. A GitLab or Bitbucket repository cannot be a run's repository yet.
  • There is no self-hosted or customer-VPC deployment, and we do not publish a compliance report today.
  • Compute is metered. Free includes 5 agent-hours a month and Pro 40, each with a weekly ceiling.
  • You review the pull request. Rush does not merge for you.

FAQ

Questions people actually ask

Is E2B cheaper than Cloudflare Sandbox?

List prices, read off each vendor's pricing page on 17 October 2026. E2B: Hobby $0 with a one-time $100 credit; Pro $150 / month plus usage. Cloudflare Sandbox: Workers Paid $5 / month, with 375 vCPU-minutes and 25 GiB-hours included. The units differ, so price the job you run, not the plan.

Where does Rush fit next to E2B and Cloudflare Sandbox?

Rush runs on E2B and returns what the coding agent runner tutorials on both leave out: the commit, the pull request and the checks.

Cluster

Keep reading

Citations

Sources

Every factual claim on this page traces to one of these URLs. Retrieval date is 17 October 2026 unless the source prints an earlier published date.

  1. [1] E2B, “E2B Pricing”, retrieved 2026-10-17. https://e2b.dev/pricing
  2. [2] E2B, “E2B | The Enterprise AI Agent Cloud”, retrieved 2026-10-17. https://e2b.dev/
  3. [3] E2B, “Sandbox persistence”, retrieved 2026-10-17. https://docs.e2b.dev/sandbox/persistence
  4. [4] E2B, “Claude Code - E2B Docs”, retrieved 2026-10-17. https://docs.e2b.dev/agents/claude-code
  5. [5] E2B, “Coding Agents - E2B Docs”, retrieved 2026-10-17. https://docs.e2b.dev/use-cases/coding-agents
  6. [6] E2B, “Available servers - E2B Docs”, retrieved 2026-10-17. https://docs.e2b.dev/mcp-gateway/available-servers
  7. [7] E2B, “e2b-dev/infra (GitHub README)”, retrieved 2026-10-17. https://github.com/e2b-dev/infra
  8. [8] Cloudflare, “Sandboxes on Cloudflare”, retrieved 2026-10-17. https://developers.cloudflare.com/sandbox/
  9. [9] Cloudflare, “Choose a sandbox environment”, retrieved 2026-10-17. https://developers.cloudflare.com/sandbox/concepts/
  10. [10] Cloudflare, “Pricing (Containers)”, retrieved 2026-10-17. https://developers.cloudflare.com/containers/platform/pricing/
  11. [11] Cloudflare, “Limits (Containers)”, retrieved 2026-10-17. https://developers.cloudflare.com/containers/platform/limits/
  12. [12] Cloudflare, “Build a coding agent runner”, retrieved 2026-10-17. https://developers.cloudflare.com/sandbox/tutorials/claude-code/
  13. [13] Cloudflare, “Cloudflare's own MCP servers”, retrieved 2026-10-17. https://developers.cloudflare.com/agents/model-context-protocol/cloudflare/servers-for-cloudflare/
  14. [14] Rush, “Rush product requirements”, retrieved 2026-09-15. https://getrush.ai/cloud
  15. [15] Rush, “Rush pricing (live contract on getrush.ai)”, retrieved 2026-09-15. https://getrush.ai/pricing
  16. [16] Rush, “Isolation, plainly”, retrieved 2026-10-17. https://getrush.ai/docs/concepts/isolation
  17. [17] Rush, “Results and proof”, retrieved 2026-10-17. https://getrush.ai/docs/concepts/results-and-proof
  18. [18] Rush, “Usage and billing”, retrieved 2026-10-17. https://getrush.ai/docs/concepts/usage-and-billing
  19. [19] Rush, “Rush MCP server”, retrieved 2026-10-17. https://getrush.ai/docs/concepts/mcp-server
  20. [20] Rush, “Automations”, retrieved 2026-10-17. https://getrush.ai/docs/concepts/automations

Next

Run the next Task on Rush

Connect a repository. Pick Claude Code, Codex, or OpenCode. Review the PR.

How the runtime works