// Hacker Noon · 4 June 2026

Prompt Caching Doesn't Just Save Money. It Lets You Run 20K-Token System Prompts.

Prompt caching on Anthropic (cache_control: ephemeral) and OpenAI (automatic) cuts the cost of your static prompt prefix by ~10x on Claude and ~2x on GPT-4o. The real unlock: 20,000-token system prompts with worked examples become affordable on every call, so you stop optimizing for prompt brevity a...

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