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COSI is a NASA Small Explorer (SMEX) satellite mission for launch in 2027. COSI is a wide-field gamma-ray telescope designed to survey the entire sky at 0.2-5 MeV. It provides imaging, spectroscopy, and polarimetry of astrophysical sources, and its germanium detectors provide excellent energy resolution for emission line measurements. I will overview the COSI mission including the science, technical design, and status. The heart of the COSI instrument is an array of high-resolution cross strip germanium sensors. I will focus deeper on germanium detector developments in support of the COSI mission and ongoing work to optimize the in-flight detector performance.
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