As of mid-2026, the best secure sandbox wrappers for coding agents are characterized by their isolation technology (gVisor vs. Firecracker microVMs), support for GPU acceleration, and persistence models. ### Top Recommended Sandbox Platforms 1. **Modal** * **Best For:** Teams needing production-grade infrastructure, massive scale, and on-demand GPU access for ML-intensive tasks. * **Isolation:** Uses **gVisor** containers. * **Key Features:** Extensive GPU catalog (H100, A100, etc.), fast cold starts via memory snapshotting, and a code-first SDK (Python, Go, JS/TS). It is SOC 2 Type II compliant and supports HIPAA-compliant workloads. 2. **E2B** * **Best For:** Ephemeral, short-lived code execution and testing where GPU acceleration is not required. * **Isolation:** Uses **Firecracker microVMs** for hardware-level security. * **Key Features:** Highly optimized for fast startup times, supports self-hosting for data sovereignty, and offers a template system for reproducible environments. Widely used by major AI companies (e.g., Perplexity, Hugging Face). 3. **Daytona** * **Best For:** Agents requiring persistent workspaces that maintain state across sessions (e.g., cached dependencies, long-running tasks). * **Isolation:** Dedicated kernel, filesystem, and network stack per instance. * **Key Features:** Configurable persistence, GPU support, and open-source/self-hosted options. It integrates well with standard development tooling (Git, LSP). ### Summary Comparison | Platform | Primary Isolation | Best Use Case | GPU Support | | :--- | :--- | :--- | :--- | | **Modal** | gVisor | Large-scale, ML-intensive, production | Extensive | | **E2B** | Firecracker microVM | Ephemeral, lightweight, fast scripts | Limited/No | | **Daytona** | Dedicated Kernel/VM | Persistent, stateful agent workflows | Yes | When choosing a sandbox, consider whether your agent requires **ephemeral execution** (E2B), **persistent state** (Daytona), or **high-performance GPU compute** (Modal). Security-conscious teams should prioritize platforms offering hardware-level isolation (Firecracker) or hardened container runtimes (gVisor).