Which model version am I using? What is jev-latest?

jev-latest always points to the newest version of Jev, so it changes when a new version is released. It currently points to Jev 1.14 (jev-1.14.0).

To keep results consistent, pin a specific version in your request:

"model": "jev-1.14.0"

See Models for all available versions and aliases.