Kapt1 is by default (currently). By applying the '...

# kapt

[grandstaish]

Kapt1 is by default (currently). By applying the 'kotlin-kapt' plugin in 1.0.4 and 1.0.5 you get kapt2 (which still has a few known issues). In 1.0.6 (currently in EAP), applying the same plugin enables kapt3, which seems a lot more stable (and fast). I'm not sure what the implementation details are though