Open-Weight AI vs. Open-Source AI: The Licensing Distinction That Matters
A new guide clarifies the difference between open-weight AI, which releases trained model parameters under a license, and open-source AI, which implies broader freedoms across software, data, documentation, and the development process. The distinction matters because most models labeled 'open' are only open-weight, not fully open-source. This affects how developers can legally use, modify, and redistribute models like Llama or Mistral. The guide explains the mechanism, trade-offs, evaluation, and controls that matter in practice.