Unverified50% confidenceFactExact time
Prompt cache hit determination is based on an exact match of "prefix + cache key", where the cache key includes some request metadata; cache writes are typically billed at 1.25 times the base input price.
1
Sources
50%
Confidence
Long-term
Relevance
10/15/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedPrompt Caching在提示词前缀完全相同且超过约1024 token阈值时命中，缓存token通常按原价的25%甚至更低计费77% similarUnverifiedCached input tokens typically enjoy a discount of 25%–50% off the original price, as there is no need to recompute embeddings and attention weights—only the precomputed KV vectors need to be loaded from cache.75% similarVerifiedThe cache read mechanism retains the KV cache for recurring long prompt prefixes, charging at an extremely low rate upon a cache hit; the leaked cache read price for Opus 5.5 is approximately 1/20 of the input price.73% similarUnverifiedCached input refers to pre-storing the same context on the server side so that subsequent requests can reuse the cache without repeated computation, and is billed at a lower price.72% similarUnverifiedPrompt caching usually has an expiration period, requires rewriting after content changes, and the cache discount applies only to the input side, while output tokens are still billed at the standard rate.72% similar
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