Pydantic Monty vs E2B

A Rust-written Python sandbox for model-generated code, as an embeddable package and a commercial server. For small controlled computations, not full Linux environments. Pydantic Monty does not publish comparable vCPU and memory rates, so no hourly price is compared; E2B lists $0.166 an hour for a 2 vCPU / 4 GiB sandbox.

bothopen-sourcerestricted-runtime

Verified 11 Nov 2026

Visit Pydantic Monty Compare with E2B and others

Pydantic Monty against E2B, line by line

E2B baseline sources

Field	-E2B (baseline)	+Pydantic Monty	Change
2 vCPU + 4 GiB, per hour	$0.166 (source: E2B Pricing)	not published	Pydantic Monty: no figure
vCPU, per hour	$0.0504 (source: E2B Pricing)	not published	Pydantic Monty: no figure
Memory, per GiB-hour	$0.0162 (source: E2B Pricing)	not published	Pydantic Monty: no figure
Billed on	wall clock (source: E2B Pricing)	not published	Pydantic Monty: no figure
Isolation	Firecracker microVM (source: E2B homepage)	restricted runtime (source: github.com)	differs
Cold start	not published	1 ms (source: github.com)	E2B: no figure
Max session	1 h (Hobby), 24 h (Pro) (source: E2B Pricing)	Configurable memory, execution time and recursion depth limits (source: pydantic.dev/docs/monty/concepts/resource-limits)	differs
Persistence	state kept, pause/resume, memory kept, fork (source: E2B homepage)	not published	Pydantic Monty: no figure
Self-host	Yes, Apache-2.0 (source: E2B runtime (GitHub))	Yes, MIT (OSS package); commercial server sold separately (source: github.com)	differs
Your own cloud (BYOC)	Yes (source: E2B homepage)	not published	Pydantic Monty: no figure
GPU	No (source: E2B Pricing)	not published	Pydantic Monty: no figure
SDKs	Python, JavaScript/TypeScript (source: E2B Pricing)	Python 3.14, documented subset (source: github.com)	differs
SOC 2	Type II (source: E2B homepage)	not published	Pydantic Monty: no figure
Free tier	Hobby: $0 plan fee, one-time $100 usage credit, 10 concurrent sandboxes, 1-hour sessions. (source: E2B Pricing)	not published	Pydantic Monty: no figure

Prices are list prices for one hour of a 2 vCPU / 4 GiB sandbox: 2 × the vCPU rate + 4 × the memory rate. Each value links to the page it came from; not published means the vendor states no figure. How we compare.

Pick Pydantic Monty instead of E2B when

you want a published start time: Pydantic Monty states 1 ms (a vendor claim), and E2B publishes no figure.
you want to run the sandbox layer yourself under a MIT (OSS package); commercial server sold separately licence (E2B's runtime is Apache-2.0 and self-hostable too).

Stay on E2B when

you run model-written code you do not control and want a dedicated kernel per sandbox: E2B uses Firecracker microVMs, Pydantic Monty uses restricted runtime.
pause has to keep running memory as well as files: E2B's pause saves both, and Pydantic Monty does not state memory state in our data.
you need a SOC 2 report: E2B states Type II, and Pydantic Monty states none in our data.
you want managed cloud, your own cloud account and self-hosting from one vendor: E2B offers all three, with BYOC on its Enterprise plan, and Pydantic Monty offers one of them.

All Pydantic Monty facts

Source per value

Isolation Isolation technology the vendor states for each sandbox.: restricted runtime 1
Other isolation options Alternative runtimes the vendor offers besides the default (e.g. VM runtime, gVisor for GPU).: Host access only through explicitly supplied functions and mounts 1
Deployment Managed cloud service, self-hosted software, or both.: both 1
Billing basis What the meter counts: wall-clock allocated resources, active CPU only, requests/plan quota, session-hours, or free software.: Not published
vCPU price $/vCPU-hr Published on-demand CPU rate normalised to USD per vCPU-hour (per-second rates multiplied by 3,600; per-core rates divided by vCPUs per core where the vendor defines it). Lowest public tier, default region. 0 means the vendor states no separate CPU charge.: Not published
Memory price $/GiB-hr Published memory rate normalised to USD per GiB-hour (GB treated as GiB where the vendor does not distinguish). 0 means the vendor states memory is free.: Not published
Sandbox from $/sandbox-hr Smallest published per-sandbox hourly price, where the vendor publishes one.: Not published
Paid plan from $/mo Cheapest paid platform plan fee (before usage).: Not published
Free tier A free plan, free monthly allowance or sign-up credit exists.: Not published
Free tier detail What the free tier or credit includes, as published.: Not published
Cold start ms Vendor-published create/boot time in milliseconds (a vendor claim, not our benchmark). Only filled when the vendor publishes a number; see startup_claim for percentile and conditions.: 1 1
Resume time ms Vendor-published resume-from-pause/standby/snapshot time in milliseconds.: Not published
Startup claim The vendor's startup/resume wording with conditions, quoted or closely paraphrased.: New OSS sandbox under 1 ms from an already-running pool; commercial server about 2 ms (project claim). 1
Max session length Longest single sandbox session by plan, as published.: Configurable memory, execution time and recursion depth limits 2
Persistence / snapshots Filesystem state can be kept between runs (snapshots, persistent disks, volumes).: Not published
Pause / resume A sandbox can be paused, suspended, hibernated or put in standby and resumed later.: Not published
Memory state kept Pause/hibernate preserves running memory state, not only the filesystem.: Not published
Fork / branch A running or snapshotted sandbox can be cloned into new sandboxes.: Not published
GPU GPU sandboxes are offered.: Not published
Self-host Can run on your own hardware or cluster (open source or licensed).: Yes 1
BYOC / VPC Vendor-managed deployment inside your own cloud account.: Not published
Open source Core sandbox runtime is published under an open-source licence.: Yes 1
Licence Open-source licence of the runtime, if any.: MIT (OSS package); commercial server sold separately 1
SDKs / languages Official SDK languages (or supported execution languages where noted).: Python 3.14, documented subset 1
Regions Published regions or region count.: Not published
Max vCPU per sandbox vCPU Largest published vCPU count per sandbox on any self-serve or enterprise plan.: Not published
Max memory per sandbox GiB Largest published memory per sandbox.: Not published
Concurrency Published concurrent sandbox limits by plan.: Not published
SOC 2 SOC 2 status as stated by the vendor.: Not published
HIPAA Vendor offers HIPAA-compliant usage/BAA (on any plan).: Not published
2 vCPU + 4 GiB per hour $/hr Hourly list price of one 2 vCPU / 4 GiB sandbox: 2 x the vCPU rate + 4 x the memory rate, from the two published rates. Left empty for self-hosted software and for vendors without both rates. Vendors that bill CPU only while busy (Vercel, Cloudflare, Upstash, Tensorlake, AWS AgentCore) cost less for idle agents than this shows.: Not published
Price vs E2B x E2B The 2 vCPU + 4 GiB hourly price divided by E2B's own ($0.1656 at $0.000014/vCPU-s and $0.0000045/GiB-s). Under 1 is cheaper than E2B.: Not published
Status Preview, experimental, beta, sunset or self-hosting caveats the vendor documents.: Not published

Sources

github.com accessed 2026-11-11
pydantic.dev/docs/monty/concepts/resource-limits accessed 2026-11-11

Pydantic Monty in the E2B comparisons

Self-hosted E2B alternativesWhich E2B alternatives can I run on my own hardware or cluster? 9 listed.

Compare with other E2B alternatives

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