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Speculative decoding inside a continuous batch: how does the scheduler budget draft tokens, and what happens to the KV on rejection?

Each draft token is a real token in the step's budget, and verification turns a bandwidth-bound step compute-bound sooner. The answer shows the accounting, the rollback that makes rejection cheap, and the batch size where speculation starts losing.

Updated Oct 2026 · Worked answers on inference mechanisms, with calculations, implementation details, and follow-up questions.

Each draft token is a real token in the step's budget, and verification turns a bandwidth-bound step compute-bound sooner. The answer shows the accounting, the rollback that makes rejection cheap, and the batch size where speculation starts losing.

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