E2B pricing for long-running AI agents

E2B pricing is built for programmatically created sandboxes: a free Hobby plan or a $150-per-month Pro plan, plus per-second compute usage. For long-running agents, calculate the plan fee, CPU, memory, storage, concurrency, and total sandbox-hours together. Then decide whether the workload truly needs disposable sandboxes or a retained computer.

This is not simply a question of which monthly number is lower. E2B and Matrix OS sell different infrastructure abstractions. E2B is designed for software that creates isolated environments through an SDK. Matrix is designed around a computer retained by a developer or team.

How does E2B pricing work?

At publication time, E2B lists:

• Hobby at $0 plus usage, with sandbox sessions up to one hour;
• Pro at $150 per month plus usage, with sessions up to 24 hours;
• CPU, memory, and some storage billed according to the selected resources;
• concurrency allowances that vary by plan.

E2B's official calculator currently lists CPU at $0.000014 per vCPU-second and memory at $0.0000045 per GiB-second. Prices and limits can change, so use the E2B pricing page for a purchasing calculation.

A reproducible cost calculation

Use this formula:

monthly cost = plan fee + (CPU rate + memory rate + storage rate) × total running seconds + concurrency add-ons

For example, a two-vCPU sandbox contributes $0.000028 per second in CPU charges at the current listed rate. Add the memory selected for that sandbox, then multiply the combined rate by every second every sandbox runs. Ten sandboxes running for ten hours equal 100 sandbox-hours, not ten.

Build the estimate from workload evidence:

Do not model an agent as active only while it generates tokens. A sandbox may remain allocated while dependencies install, tests run, services stay available, or a human reviews an artifact.

What do the session limits mean?

E2B documents a maximum running duration of one hour on Hobby and 24 hours on Pro. Its SDK also documents beta pause and reconnect behavior. That makes the simplistic claim that every stopped connection destroys all useful state inaccurate. Review the current sandbox API.

The architectural question remains: should your application manage sandbox lifecycle, or should a project retain one computer? A 24-hour ceiling may be irrelevant for a 20-minute test run and central to a workspace expected to remain available for weeks.

When E2B is the natural fit

Choose the sandbox model when:

• an application creates isolated execution environments for many users or jobs;
• each task should start from a controlled template;
• strong task-level isolation matters more than continuity;
• the workload is bursty enough that per-second billing is advantageous;
• lifecycle control belongs in your product's code.

That is a meaningful category, not a deficient version of a VPS.

When retained compute is the natural fit

A retained computer is more natural when one developer or team repeatedly returns to the same repositories, dependencies, terminals, databases, and preview services.

See current Matrix plans and resources and the terms displayed at checkout. Choose the computer lifecycle and capacity required by your workload; agent-provider access can have separate costs.

Matrix is not designed to replace E2B when a product needs thousands of API-created sandboxes. E2B is not designed to be a named developer computer. Compare them only after classifying the workload.

The buying decision

Run a one-week measurement rather than comparing headline prices:

1. Count total sandbox-hours and peak concurrency.
2. Record the resources required for representative builds.
3. Include idle waits and failed-task recovery.
4. Price the workload with each provider's current calculator.
5. Evaluate operational fit: API-managed sandboxes or a retained workspace.

For a broader landscape, read E2B alternatives for persistent AI-agent workloads and How to choose hosting for AI coding agents.

Frequently asked questions

Is E2B Pro $150 per month all-inclusive?

No. E2B currently describes Pro as $150 per month plus usage costs. Model CPU, memory, storage, duration, and concurrency using its current pricing page.

Can an E2B sandbox run overnight?

Yes, when the task fits the active plan's duration and resource limits. Pro currently lists sessions up to 24 hours. Design explicit checkpoints for any task that could exceed its window.

Does E2B support persistence?

E2B documents pause, reconnect, templates, and lifecycle controls. Verify the exact guarantees needed by your workload rather than treating “sandbox” as synonymous with “all state disappears immediately.”

Is Matrix OS cheaper than E2B?

For one retained developer computer, Matrix's fixed plan may have a lower headline price. For high-volume disposable execution, E2B's API and usage model may be the better fit. They should be compared with a representative workload, not one price.

Try a first task in Matrix

Measure the active duration and retained storage of one representative task.

1. Follow the quickstart to sign in, choose a computer and complete any required provisioning. To use the native app, follow the desktop installation and approval steps.
2. Open a separate session with a small sample project or synthetic input. Configure the agent access needed for that task and make the expected output explicit.
3. Compare current billing units and idle-time behavior before estimating a monthly bill.

For a worked coding example, use the setup and reconnect walkthrough. Inspect the result before expanding the scope or leaving a longer task unattended.

Open Matrix →Read the quickstart →Current plans and pricing →