Open weights vs open source AI: the simple test

Oct 20, 2026 · Explainer · AI

When a company calls its AI model open, what do you get? Open weights means you get the trained model's weights. The Open Source Initiative's Open Source AI Definition 1.0 asks for more: the weights, the complete training and running code, and detailed information about the training data.

Source: Open Source Initiative, https://opensource.org/ai/open-source-ai-definition

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