The Cerebras version of 5.6 is available only to select customers

You're right, I should have clarified that they are still slowly integrating it and it isn't the thing running all models. I meant moreso that since they are planning on moving more usage over to Cerebras wafers, they're able to relieve some pressure on their predicted expenses while also moving some current workload (ultrafast and codex spark) onto them freeing up Nvidia GPUs.