Summer is a local, open-source tool for AI-coding usage and spend, built by Autumn. Per developer, across Claude Code, Codex, and opencode, it answers: how much is each engineer using, on what models, and what's it worth?

How it works

Summer needs zero hosting. It uses Autumn as its backend and comes with a local dashboard — Autumn stores every usage event, prices tokens (via Models.dev), and aggregates usage across your whole team.

Get started

Note: If you already have an Autumn org, create a new org to use with Summer.

bun -g install @useautumn/summer   # install Summer

summer start                        # set up, then track usage in the background

summer dash                         # open the usage dashboard

summer start does everything first-time setup needs:

1. Authenticates with Autumn via OAuth — logs you in (or signs you up) and sets up your org.
2. Offers to backfill your history.
3. Starts a local daemon to collect Claude Code + Codex usage and send it to Autumn.

summer dash serves a local UI (and opens it in your browser): a usage chart you can group by harness / model / user / billing mode, filter by any property, search per-developer usage, and inspect the raw events.

Note: Summer installs an autostart service (launchd/systemd) so it survives reboots. Pass --no-service for a plain background process.

Claude Code requires a restart to send usage after summer start. Either start new sessions, or for existing ones, restart and /resume. (Codex/opencode don't need a restart.)

Invite your team

Summer rolls up usage across everyone in your Autumn org.

1. Open your Autumn org settings → Members.
2. Invite a teammate by email.
3. They accept the invite in Autumn, run summer start themselves, then restart Claude Code (see the note above — otherwise only their backfill shows up, not live Claude usage).

That's it — their usage shows up alongside yours in the dashboard.

Commands

Harnesses Supported

Claude Code, Codex, OpenCode