Overview
Build with Tessen intelligence from the tools you already use, starting with Project Zero in OpenCode.
Tessen Platform is where developers build with Tessen. The first thing you can build with is Project Zero: Tessen intelligence for real coding work, free during the Developer Alpha, inside OpenCode.
The fastest path
Install the Tessen CLI
One command. Requires Node.js 20 or newer, on macOS, Linux or WSL.
curl -fsSL https://github.com/TessenLab/zero/releases/latest/download/install.sh | shSign in and authorize this machine
The CLI shows a short code and opens the Tessen approval page. You never paste a key.
tessen auth:loginConnect OpenCode
Adds Tessen as an OpenCode provider and hands OpenCode the credential from your sign-in.
tessen opencodeBuild
Select tessen/project-zero in OpenCode and start working.
opencode --model tessen/project-zero
What you can use today
| Surface | Status | Start here |
|---|---|---|
| Project Zero in OpenCode | Developer Alpha | Quickstart |
| Tessen CLI | Developer Alpha, installed from GitHub | Tessen CLI |
| Project Zero API (OpenAI-compatible) | Developer Alpha, same credential as OpenCode | API overview |
| Tessen Node | Not yet released | Node overview |
Project Zero shows no provider, model or price. You choose Project Zero; Tessen chooses verified zero-cost capacity behind it, and never falls back to paid capacity.