The Working Group Sustaining Infrastructures of the Barcelona Declaration examines how open infrastructures for research information can be sustainably supported across the research ecosystem. As part of this work, the Working Group is exploring different governance approaches, sustainability models, and forms of community engagement that underpin existing infrastructures. In September and October 2025, the Working Group organized two knowledge-sharing sessions with open infrastructures (Session 1) and initiatives operating at the ecosystem level (Session 2) to discuss sustainability models and how these can be strengthened through community engagement, coordination, transparency, and strategic investment.The sessions aimed at knowledge sharing and identifying where the Barcelona Declaration community (and the Working Group in particular), can most effectively contribute in supporting signatories as they transition toward open research information.Additional materialsSession on Open Infrastructures🖥️ Presentations: https://doi.org/10.5281/zenodo.18187006🎬 Recording: https://www.youtube.com/watch?v=nf_5px0PjzsSession on Related Initiatives🖥️ Presentations: https://doi.org/10.5281/zenodo.18188254🎬 Recording: https://www.youtube.com/watch?v=nf_5px0Pjzs