We are pleased to announce the release of JEDI 2026.1, a major coordinated update with over 1,500 pull requests merged since the last release, spanning 9 model applications and 89 observing instruments.

This release reflects significant depth of development across all six core repositories: OOPS (framework and solvers), UFO (observation operators), CRTM (radiative transfer), IODA (observation data), SABER (background error covariances), and VADER (variable transforms). Each saw substantial new capabilities, performance improvements, and scientific advances. Model applications for atmospheric, ocean, sea-ice, land, aerosol, and composition components were all updated, with a new ionospheric DA application extending JEDI's reach into space weather for the first time.

We gratefully acknowledge the JCSDA partner agencies and institutions whose contributions shaped this release: NOAA, NASA, USAF, USN, the Met Office, ECMWF, NCAR/UCAR, NRL, and Met Norway, among others.

Full release notes and updated documentation are available at https://www.jcsda.org/jedi-2026-1