Best Agent Sandboxes 2026: Comparing 5 Platforms
An in-depth look at 5 AI agent sandbox platforms in 2026, comparing cold start speeds, per-second pricing, and network policies.
Stock photo for illustration only, not from the actual event
- Compares five core platforms: E2B, Daytona, Modal, Cloudflare, and Vercel.
- Emphasizes measuring Time to Interactive (TTI) and real workloads over vendor claims.
- Network policy and credential management are more critical than raw speed.
This comparison covers the five sandbox platforms most development teams shortlist in 2026: E2B, Daytona, Modal Sandboxes, Cloudflare Sandbox SDK, and Vercel Sandbox, alongside references to Runloop, Fly.io Sprites, and Northflank where relevant.
Vendor performance claims are rarely directly comparable. Daytona advertises sub-90ms sandbox creation, E2B is commonly cited at around 150ms, and Modal advertises sub-second cold starts for pre-cached containers. However, none of these metrics consistently state concurrency levels, regions, image sizes, or exact timing checkpoints.
The most useful public benchmark dataset is ComputeSDK's open-source sandbox leaderboard, which measures Time to Interactive (TTI)—the elapsed time from create() to the first successful command inside the sandbox across 100 concurrent iterations from a 4 vCPU host in Northern Virginia.
Stock photo for illustration only, not from the actual event
Evaluating sandbox performance requires testing realistic agent workloads, such as installing packages and executing data processing tasks, rather than relying on basic echo commands. Real-world agent behavior places unique demands on infrastructure.
Pricing models and network security configurations vary significantly among providers, making them crucial factors for production deployments involving untrusted inputs and API credentials.
Every platform in this comparison now supports running sandboxes without internet access, but they differ in policy precedence and granularity. For instance, E2B allows rules to take precedence over deny rules, whereas Vercel Sandbox applies the exact opposite logic.
Furthermore, E2B notes that blocked TCP connections can appear successful from inside the sandbox because the firewall accepts the connection before evaluating destination rules. Therefore, egress must always be verified using application-level responses rather than basic connection checks.
Source: MarkTechPost
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