Prompt-cache hit rate per provider, April 2026

Which AI providers have the highest prompt-cache hit rate? In April 2026 Anthropic-direct led the Requesty gateway at 77% (cached_tokens / input_tokens), Bedrock Claude was healthy at 57%, and Vertex (Claude) trailed at 24%. Same Claude model family, 3× lower hit rate. Vertex (Gemini) sat at 10% and Mistral at 4%, the floor among major routes.

Why it mattersPrompt caching directly cuts the per-request cost of long, repeated context. The difference between a 77% hit rate and a 24% hit rate on the same model family is roughly a 3× reduction in input tokens billed at full price. The Vertex-Claude gap looks like a configuration issue rather than a platform limitation, which means Claude users on Vertex are leaving substantial savings on the table without a code change.

Requesty (2026). Prompt-cache hit rate per provider, April 2026. Requesty Data. https://requesty.ai/data/cache-hit-rate-by-provider-april-2026

@misc{requesty_cache_hit_rate_by_provider_april_2026,
  author       = {{Requesty}},
  title        = {Prompt-cache hit rate per provider, April 2026},
  year         = {2026},
  howpublished = {\url{https://requesty.ai/data/cache-hit-rate-by-provider-april-2026}},
  note         = {Requesty Data}
}