Which is better, Morph or Prime Sandboxes?
It depends on the shape of your RL environment. For rollouts that mostly wait on a model, Runtime costs $0.64 for the benchmark job, against $1.67 on Morph and $1.52 on Prime. It can also fork a warmed-up sandbox with its memory. Pick Morph for tree search over hundreds of branches of one live machine. Pick Prime Sandboxes for farms of thousands of independent episodes on Prime's platform.
At a glance
| Morph | Prime Sandboxes | Runtime | |
|---|---|---|---|
| Isolation | Full virtual machines | Hardware-virtualized microVM, own guest kernel | Firecracker microVM, own kernel |
| Price | $0.05 per MCU-hour: 1 vCPU, 4 GB or 16 GB of disk | $0.02 per vCPU-hour, $0.0125 per GiB-hour | Measured CPU and reserved memory |
| Branching | Infinibranch, to hundreds of replicas | Forks from a filesystem checkpoint; no memory | Forks, up to 100 running copies |
| At once | Set by plan | 1,024 to start | 100 paid |
| Plan | Developer free with no credit; Team $40, Scale $250 a month | None; rates through 22 December 2026 | None; prepaid credit from $10 |
Two shapes of RL environment
A search-heavy agent that explores many paths from one state wants Morph's branching: set up once, then copy the live machine hundreds of times. A rollout farm that runs thousands of independent episodes wants Prime's breadth. Runtime sits between the two. It forks a warmed-up sandbox into up to 100 copies at once, at the lowest price per run.
Cost for the same job
2 vCPU and 4 GB (2 MCUs on Morph), 60 seconds, 20 CPU-seconds, 1,000 runs, with Prime's 5 GiB disk:
- Size
- 1,000 × 60 s / 3,600 × 2 MCU × $0.05
- $1.67
- CPU
- 1,000 × 60 s / 3,600 × 2 × $0.02
- $0.67
- Memory
- 1,000 × 60 s / 3,600 × 4 × $0.0125
- $0.83
- Disk
- 1,000 × 60 s / 3,600 × 5 × $0.0002
- $0.02
- CPU
- 1,000 × 20 s / 3,600 × $0.025
- $0.14
- Memory
- 1,000 × 60 s / 3,600 × 4 × $0.0075
- $0.50
With both CPUs busy for the whole minute, the cost is $1.67 on Morph, $1.52 on Prime, and $1.33 on Runtime.
Which one to pick
- Morph for tree search over one live machine.
- Prime Sandboxes for wide, independent rollouts.
- Runtime for the cheapest run, and forks that keep memory.
See Runtime vs Morph and Runtime vs Prime Sandboxes.
Runtime Cloud
Runtime costs 62% less than Morph and 58% less than Prime for rollouts that wait on a model. 1,000 one-minute runs of a 2 vCPU, 4 GiB sandbox with 20 CPU-seconds of work each cost $1.67 on Morph, $1.52 on Prime Sandboxes, and $0.64 on Runtime.
Start free: npx withruntime login signs you in. The migration
guide shows how to move rollout code from Morph or Prime.
Sources
Morph rates were checked 25 October 2026. Prime Sandboxes rates were checked 25 October 2026.
- Morph Cloud pricing, Morph Devboxes
- Prime Sandboxes overview, Prime Sandboxes launch
- Runtime pricing
Facts on this page were checked on 26 October 2026.