The best AI agent sandboxes in 2026

Verified 2026-07-26

1. 1
   Blaxel AI code-execution sandbox

   Blaxel is an idle-cost-optimized sandbox that resumes from hibernation in ~25ms with memory and processes intact, and charges $0 for compute on standby.

   Details →
2. 2
   Cloudflare Sandbox SDK AI code-execution sandbox

   Cloudflare Sandbox SDK runs code on Cloudflare Containers + Durable Objects, blending V8 isolates (sub-50ms) with containers, bundled into the Workers Paid plan.

   Details →
3. 3
   Daytona AI code-execution sandbox

   Daytona is an open-source, container-isolated sandbox for AI agents with sub-90ms creation, persistent stateful workspaces, mid-execution snapshots and optional H100 GPUs.

   Details →
4. 4
   E2B AI code-execution sandbox

   E2B is a Firecracker-microVM sandbox that gives AI agents a secure, ~150ms-cold-start environment to run generated code, with pause/resume and filesystem snapshots.

   Details →
5. 5
   Northflank AI code-execution sandbox

   Northflank runs sandboxes with selectable Kata/gVisor microVM isolation, unlimited session duration, any OCI image and BYOC deployment — at the lowest published vCPU rate in the category.

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6. 6
   Fly.io Machines AI code-execution sandbox

   Fly.io Machines are fast-booting microVMs with a persistent ext4 filesystem, ~300ms checkpoints, zero idle cost and a native MCP endpoint.

   Details →
7. 7
   Vercel Sandbox AI code-execution sandbox

   Vercel Sandbox is a Firecracker-based, JavaScript/TypeScript-native sandbox that is persistent by default, billed on active CPU plus a per-creation fee.

   Details →
8. 8
   Runloop AI code-execution sandbox

   Runloop provides enterprise "devbox" infrastructure for coding agents — SOC 2, 10K+ parallel instances, git-style disk snapshots with branching, and built-in SWE-bench evaluation.

   Details →
9. 9
   CodeSandbox SDK AI code-execution sandbox

   CodeSandbox SDK (now Together Code Sandbox) runs Firecracker microVMs with a git-versioned filesystem, ~500ms resume and sub-second forking, tuned for web-dev agents.

   Details →
10. 10
    Modal AI code-execution sandbox

    Modal is a Python-first serverless compute platform whose Sandboxes offer gVisor isolation, sub-second cold start and — uniquely — GPUs (T4 through B200) inside the sandbox.

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Rankings reflect published specs as of the verified date and are not paid placements. Corrections welcome at hello@comparesandboxes.com.