# Limits

> What Klio Compute supports today: Python versions, GPUs per container, defaults and what isn't available.

Canonical page: https://klio.tech/docs/limits

## Python

- The SDK installs on Python 3.10 to 3.13.
- Containers run Python 3.12. An image built on your own base image may use any Python; see [images](https://klio.tech/docs/images.md).

## GPUs

- 1, 2, 4 or 8 GPUs of one type per container, on one machine. More than one needs a paid workspace.
- A GPU type can be unavailable for a while. `klio gpus` shows what can start now, and a list in `gpu=` falls back to another type.

## Defaults you can change

Table: SDK defaults

| Setting | Default |
| --- | --- |
| `@function(timeout=)` | 3600 seconds |
| `@endpoint(timeout=)` | 180 seconds |
| `@endpoint(keep_warm_seconds=)` | 180 seconds |
| `klio model deploy --keep-warm` | 300 seconds |

## Not available

- Machines, pools and workers are managed for you, so there are no commands for them.
- From the Modal API: `@modal.clustered`, `@modal.batched`, `@modal.web_server`, `@modal.wsgi_app`, `.remote_gen()`, `CloudBucketMount`, `region=` and `cloud=`. See [coming from Modal](https://klio.tech/docs/migrate-from-modal.md).

## Billing limits

Purchases are between $10 and $1,000 each, up to a monthly limit of $500 unless you change it. See [pricing](https://klio.tech/docs/pricing.md).