UNIFI released Version 3 of Specifications for Grid-Forming Inverter-Based Resources. This latest edition of the grid-forming specs is notable because it will form the base of IEEE standard P2800.1, a new recommended practice for functional capabilities and performance of GFM resources. As the culmination of work to date, and following open input on Version 2 of the specifications, the Version 3 specifications provide a few important criteria updates to more rigorously define GFM capabilities. These include frequency-domain criteria and quantitative pass-fail tests. UNIFI members presented their progress on the specs at conferences and gatherings throughout 2025, with the IEEE standard expected to start balloting in late 2026.