Jamba 1.5 Large

Three hundred and ninety-eight billion parameters of which ninety-four do the work at a time, and unlike the Jamba before it this one's weights were published — under a licence AI21 wrote for itself and named after the model. Amazon has set 26 November 2026 as its last day, six months in advance and in writing, which is more notice than most of the models buried here were given.