Install OpenCode with npm:

npm install --global @opencode/cli@latest

If you have --ignore-scripts enabled, you’ll get the error when opening OpenCode:

opencode

Error: @opencode/cli's postinstall script was not run.

This occurs when installation scripts are disabled.
Run the package postinstall script or reinstall with scripts enabled.

Run the postinstall script:

node "$(npm root -g)/@opencode/cli/postinstall.mjs"

Then open OpenCode:

opencode