Engine version

Engine version the run must use; empty = current

What it is

An optional engine version to run against. A version the service does not run is rejected. Every response carries the version it ran.

Typical values and how to get it

The version is the year and month of the engine release, YYYY.MM, for example 2026.09. Send the version a previous run returned to reproduce it exactly. If not given: the current engine; a run that names another version is refused.

API

engine_version