Key terms
What is an open-weight model, and is it the same as open source?
An open-weight model has its trained parameters, called weights, published so others can run or adapt it. It is not the same as open source: training data and code may not be released, and licence terms can restrict how the weights are used.
The full answer
An open-weight model is one whose trained parameters, called weights, are published so others can run or adapt it. It is not the same as open source: training data and code may not be released, and licence terms can restrict how the weights are used.
On this site's model list, DeepSeek V4.1 Flash and GLM-5.3 are marked as open-weights.