Maya 2023.1 ships with MtoA 5.1.2 for Arnold 7.1.1.1 which introduces increased stability, USD and Hydra Render Delegate enhancements and integrations, performance optimizations, and bug fixes.
MtoA 5.1.2 also delivers compatibility with Bifrost 2.4.0.0 and Maya USD 0.18.0.
Image courtesy of Lee Griggs
See the Arnold for Maya release notes for the full list of recently added features and bug fixes for versions 5.1.2 and earlier.