# CLI Reference

The `tinker` command-line tool manages sessions, checkpoints, and billing usage. It is installed with the Tinker SDK (`pip install tinker`).

## **tinker** \[*OPTIONS*\] *COMMAND*

**Global Options** (available on all commands):

- `-f, --format [table|json]` — Output format (default: table)
- `-h, --help` — Show this message and exit

**Commands:**

- [`tinker auth`](https://tinker-docs.thinkingmachines.ai/tinker/cli/auth/index.md) — Authenticate with Tinker.
- [`tinker billing`](https://tinker-docs.thinkingmachines.ai/tinker/cli/billing/index.md) — View billing usage.
- [`tinker checkpoint`](https://tinker-docs.thinkingmachines.ai/tinker/cli/checkpoint/index.md) — Manage checkpoints.
- [`tinker session`](https://tinker-docs.thinkingmachines.ai/tinker/cli/session/index.md) — Manage sessions.

### tinker version

Show version information.

```bash
$ tinker version
tinker 0.24.0
```