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If your application sends repeated requests that share a long, stable prefix, such as a system prompt, a reference document, or a set of few-shot examples, prompt caching can meaningfully cut both your latency and your bill, with zero changes required on your end. TL;DR Prompt caching is now live on SambaCloud, starting with MiniMax M2.7, so applications that resend a long, stable prefix (a system prompt, reference document, or set of few-shot examples) get faster, cheaper inference with zero code changes. It runs on Automatic Prefix Caching (APC): when a new request shares a common prefix with one recently processed, those tokens are served from cache instead of recomputed, and it turns on automatically once the prefix clears a minimum length threshold of 4,096 tokens. 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