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How do you handle expert load balancing in an MoE model? What happens if 90% of tokens route to 10% of experts?

The MoE question frontier labs use to test whether you see routing as a systems problem, not just a modeling trick. Covers the collapse spiral, auxiliary losses, capacity factors, and what changes at serving time.

Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

The MoE question frontier labs use to test whether you see routing as a systems problem, not just a modeling trick. Covers the collapse spiral, auxiliary losses, capacity factors, and what changes at serving time.

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