Blaxel alternatives in 2026 15 agent sandboxes ranked by cost

What is the best alternative to Blaxel?

It depends on how your agent spends its time and what a pause must keep. For agents that mostly wait on a model, Runtime has the lowest cost: $0.64 against $3.45 on Blaxel for the job below. CPU is metered on use, and memory is priced separately. A paused sandbox keeps its memory and processes. Pick Cloudflare Sandbox if your app runs on Workers, Northflank to deploy into your own AWS, GCP or Azure account, and Daytona or Modal for GPUs.

Why do teams look beyond Blaxel?

Blaxel sells one meter: memory for the time a sandbox is active. The CPU is included in that price. That is simple, and it is where the reasons to move come from:

• The memory rate covers the whole bill. $0.0000115 per GB-second is $0.0414 per GB-hour, more than five times Runtime's $0.0075 per GiB-hour. Runtime bills measured CPU on top, at $0.025 per vCPU-hour, and the total is still lower.
• CPU is set by memory. 8 GB gets 4 cores. A job that needs more CPU buys memory it does not use. On Runtime, you choose vCPUs and memory separately.
• Paused work costs more to keep. Blaxel's standby snapshots cost $0.20 per GB a month. A paused Runtime sandbox keeps its files, memory and processes for $0.08 per GB a month, while you have credit.
• Company sign-in costs extra. Blaxel's pricing page, read on 25 October 2026, lists SAML with its Dedicated Support add-on and private network connectivity on its Custom plan. Runtime includes SAML, OIDC and SCIM on every account. Paid accounts reach their own network over a WireGuard private network.
• Every run is billed 15 seconds longer. Blaxel's docs say standby starts about 15 seconds after the last connection closes, and memory is billed until then. A Runtime sandbox pauses immediately when you ask.

Which alternatives are cheapest?

One job, priced at published list rates: 1,000 runs of a 2 vCPU, 4 GiB sandbox lasting 60 seconds, of which 20 CPU-seconds are real work. Blaxel is priced at 4 GB of memory while active, which gives it the same cost as E2B and Daytona. The sums for every row are on pricing. They leave out plan fees, storage, network, credits and negotiated rates.

Cost for the same job

The calculations for Runtime, Blaxel, Fly Sprites (the other sandbox that pauses itself) and E2B:

Blaxel's single meter ignores CPU. So with both CPUs busy for the whole minute, the job costs $1.33 on Runtime, $3.45 on Blaxel, $3.47 on Sprites and $2.76 on E2B. Blaxel's cost stays unchanged. Runtime's busy figure is still 61% below Blaxel's. Over a month of 100,000 waiting runs, that is $63.89 on Runtime against $345.00 on Blaxel.

The Blaxel figure includes the 15 seconds or so that each sandbox stays billed after its run, before Blaxel puts it on standby.

How each alternative compares for a Blaxel user

1. Northflank: low allocated rates, CPU chosen separately

$0.01667 per vCPU-hour and $0.00833 per GB-hour, so a job that needs more CPU than memory does not have to buy the memory. Each sandbox is a service with a deployment plan, and it can deploy into your AWS, GCP or Azure account.

2. Cloudflare Sandbox: filesystem-only snapshots

Active CPU at $0.072 per vCPU-hour, 3 GiB per vCPU at least, and a Worker on the Workers Paid plan to call it. Cloudflare's public-beta snapshots preserve files, but processes and memory restart. A Blaxel standby keeps running state.

3. Fly Machines: flat hourly sizes

performance-2x with 4 GB costs $0.0916704 an hour in iad, in 17 regions. Its root disk is temporary, and suspend is the way to keep memory.

4. Morph: copy a machine mid-run

At $0.05 per MCU-hour, where an MCU is 1 vCPU, 4 GB of memory or 16 GB of disk, Morph is billed by the largest need. Infinibranch turns one running machine, including its memory, into hundreds of copies.

5. Vercel Sandbox: active CPU, filesystem stops

A Firecracker microVM at $0.128 per active CPU-hour and $0.0212 per GB-hour in iad1. Stopping keeps the filesystem, and processes start fresh.

6. CodeSandbox SDK: memory snapshots in fixed shapes

The Nano VM (2 cores, 4 GB) is $0.1486 an hour, billed by the minute rounded up. It supports memory snapshot and restore. Its free Build plan allows 10 VMs running at the same time.

7. E2B: separate meters, billed on allocation

$0.0504 per vCPU-hour and $0.0162 per GiB-hour. Hobby sandboxes stop after one hour. Pro, at $150 a month, runs them for 24.

8. Daytona: E2B's price with GPUs

The same rates as E2B. Containers by default, unless you choose the VM class. Daytona also offers GPU sandboxes, Windows machines and $200 of free compute.

9. Fly Sprites: the other sandbox that sleeps itself

$0.0385 per measured CPU-hour and $0.021875 per GB-hour of memory in use. When a Sprite sleeps, its 100 GB disk costs $0.02 per GB a month.

10. Modal Sandboxes: gVisor and GPUs

$0.1419 per physical core-hour on the larger of request and use, beside Modal's GPU functions.

11. Runloop: evaluation devboxes

$0.108 per CPU-hour, $0.0252 per GB-hour and a disk charge. Runloop offers devboxes for evaluating models on your own workload and for RL rollouts.

How to switch from Blaxel

On Runtime, Blaxel code keeps running after one import change, in TypeScript or Python:

TypeScriptimport { SandboxInstance } from "withruntime/blaxel"; // was: from "@blaxel/core"

Pythonfrom withruntime.blaxel import SandboxInstance  # was: from blaxel.core import SandboxInstance

Environment variables, named processes, files, previews and the code interpreter work as they did. A call that Runtime handles differently throws an error that names what to use instead. Runtime's own call to run code is short too:

TypeScriptimport { Sandbox } from "withruntime";const box = await Sandbox.create();try {  await box.files.write("/workspace/invoice.py", "print(sum([125, 250, 375]))\n");  console.log((await box.exec("python3 /workspace/invoice.py", { check: true })).stdout);} finally {  await box.stop();}

Pythonfrom withruntime import Sandboxwith Sandbox.create() as box:    box.files.write("/workspace/invoice.py", "print(sum([125, 250, 375]))\n")    print(box.exec("python3 /workspace/invoice.py", check=True).stdout)

Blaxel's standby maps to a named sandbox that pauses when idle. It wakes on the next exec, file call or preview visit, with its memory and processes:

TypeScriptimport { Sandbox } from "withruntime";const dev = await Sandbox.getOrCreate("dev", { idlePauseSeconds: 900 });await dev.exec("git pull || true");

A coding agent can handle the rest. Paste the instruction from migration. The agent swaps the calls on a branch, runs them on free usage and totals the monthly saving. Once some real sandboxes have run, npx withruntime compare --from blaxel prices them at Blaxel's published rates. Credit you add within 30 days of signing up is matched, up to $1,000 in total. More on pausing: pause and resume a sandbox and sandbox snapshot.

Sources

Fly.io prices checked 25 October 2026.

• Cloudflare sandbox lifetime, snapshot behavior checked 25 October 2026. The other rivals' rates were checked 25 October 2026. Blaxel's rates checked 25 October 2026, with its pricing page and sandbox documentation.

• Blaxel pricing

• Cloudflare Containers pricing

• Daytona pricing

• Together: CodeSandbox SDK

• Northflank pricing

• Runloop pricing

• Fly.io pricing

• Morph Cloud pricing

• E2B pricing

• Modal pricing

• Vercel Sandbox pricing

• Runtime pricing and the Blaxel comparison