Map-Reduce / Dynamic Fan-Out · SOP

Pattern: results = reduce(combine, parallel_map(f, L)) where f is one or more LM calls. The only reason to fan out is that latency or throughput matters more than the cost of doing it. The only reason to fan in is that the consumer wants one answer, not N.

Source posture: claims grounded in primary docs and 2026 production write-ups, cited inline with short tags resolved in the citation index.

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