Best Agent Sandboxes in 2026: Cold Start, Per-Second Pricing, and Network Policy Across E2B, Daytona, Modal, Cloudflare, and Vercel
MarkTechPost Michal Sutter
E2B, Daytona, Modal Sandboxes, Cloudflare Sandbox SDK, and Vercel Sandbox were compared across cold starts, per-second pricing, filesystem persistence, and egress policy to make their agent-sandbox units measurable. The August 21, 2026 benchmark run reported median time-to-interactive values ranging from 0.67s (Vercel Sandbox) to 5.06s (Cloudflare Sandbox) with differing success rates and burst conditions. The result is a practical testing and costing framework (TTI/task checkpoints plus normalized rate-card calculations) that changes provider selection based on concurrency capacity, idle billing, persistence defaults, and how network rules are applied.
Why it matters
Every agent that writes code needs somewhere to run it, and no two vendors quote the same units. This comparison measures burst cold start across E2B, Daytona, Modal, Cloudflare, and Vercel, normalizes per-second rates to cost per 1,000 executions, and maps filesystem persistence, idle billing, and egress policy against primary sources verified August 27, 2026. The post Best Agent Sandboxes in 2026: Cold Start, Per-Second Pricing, and Network Policy Across E2B, Daytona, Modal, Cloudflare, and Vercel appeared first on MarkTechPost.