Context Caching: How to Reduce Costs on Repeated Prompts

By C.W. Jameson · Published 28 October 2025 · Last reviewed 28 November 2025

Prompt caching cuts costs by up to 90% on repeated system prompts. Most teams leave this saving on the table.

How Anthropic, OpenAI, and Google implement prompt caching, and how to architect prompts to maximise cache hits.