wehub-resource-sync
26382a7ac6
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588 B
588 B
Provider prompt caching
Provider-side prompt caching rewards byte-stable prefixes. Anthropic bills cached input tokens at a 90% discount versus fresh input, while OpenAI bills cached input at roughly a 50% discount. lean-ctx keeps the carried conversation prefix byte-identical across turns so the bulk of a long session is billed at the cheap cached rate instead of the full input price.
This is why output determinism matters commercially: any timestamp or counter in a tool-output body would change the bytes, break the cache key, and forfeit the discount on every following turn.