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GMagAO-X is a visible to NIR extreme adaptive optics (ExAO) system that willbe used at first light for the Giant Magellan Telescope (GMT). GMagAO-X isdesigned to deliver diffraction-limited performance at visible and NIRwavelengths (6 to 10 mas) and contrasts on the order of $10^{-7}$. The primaryscience case of GMagAO-X will be the characterization of mature, andpotentially habitable, exoplanets in reflected light. GMagAO-X employs awoofer-tweeter system and includes segment phasing control. The tweeter is a21,000 actuator segmented deformable mirror (DM), composed of seven individual3,000 actuator DMs. This new ExAO framework of seven DMs working in parallel toproduce a 21,000 actuator DM significantly surpasses any current or near futureactuator count for a monolithic DM architecture. Bootstrapping, phasing, andhigh order sensing are enabled by a multi-stage wavefront sensing system. GMT'sunprecedented 25.4 m aperture composed of seven segments brings a new challengeof co-phasing massive mirrors to 1/100th of a wavelength. The primary mirrorsegments of the GMT are separated by large >30 cm gaps so there will befluctuations in optical path length (piston) across the pupil due to vibrationof the segments, atmospheric conditions, etc. We have developed the HighContrast Adaptive-optics Testbed (HCAT) to test new wavefront sensing andcontrol approaches for GMT and GMagAO-X, such as the holographic dispersedfringe sensor (HDFS), and the new ExAO parallel DM concept for correctingaberrations across a segmented pupil. The CoDR for GMagAO-X was held inSeptember 2021 and a preliminary design review is planned for early 2024. Inthis paper we will discuss the science cases and requirements for the overallarchitecture of GMagAO-X, as well as the current efforts to prototype the novelhardware components and new wavefront sensing and control concepts for GMagAO-Xon HCAT.

GMagAO-X: A First Light Coronagraphic Adaptive Optics System for the GMT