Mistral Large 4 brings trillion-parameter open weights with deployment and license caveats

Mistral released Large 4 weights, describing a trillion-parameter multimodal MoE with about 52B active parameters and three reasoning modes. Reported coding, cyber, and cost-per-task results are mixed across coverage and require independent validation; modified/custom MIT-style terms include commercial-use caveats, and the model’s scale leaves practical self-hosting demands unresolved. The release has also renewed debate over whether open weights alone amount to open source.