Defining Open Source AI is the most significant challenge facing the Open Source movement. Government regulations have begun, companies are calling AI systems “Open Source” even though their licenses contain restrictions and limitations that go against the widely accepted principles and freedoms of Open Source. The Open Source Initiative (OSI) presents its critical project: Defining Open Source AI. The talk will present the Release Candidate of the Open Source AI Definition, the result of multi-year, global, multi-stakeholder process. The session will be highly interactive, soliciting feedback to a standard that will surely have significant impacts on the world of AI and on the Open Source community at large.