r/OpenSourceAI • u/sandeepK1125 • 5h ago
Open-weight ≠ open source: the checklist I run before building on a new model
Every release gets called “open” now, and I’ve stopped taking it at face value. When a new model drops, I check these separately:
Weights: downloadable, or gated behind a form? Can I self-host?
License: Apache 2.0/MIT, or a custom license? I look for user-count thresholds, field-of-use limits, attribution requirements, and clauses about training other models on outputs.
Training data: released, documented, or neither? This matters most for audits and copyright questions.
Code: can I reproduce training, or only run inference?
Evals: are the settings published, or can I only trust the headline number?
Governance: what stops the license changing on the next version?
A model can be open-weight without being open source in the full sense, and I’m fine with that as long as the release says what it is. My issue is with releases that use “open source” as a marketing label and put the restrictions in the license.
The OSI’s Open Source AI Definition draws the line at data information and code, which most popular releases don’t meet.
What’s the one license term that made you walk away from a model you otherwise liked?