Prompt caching — CCA-F Exam Prep

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PERSONA startup CTO looking at a Claude API bill on her laptop. The number: $12,400/month. She's highlighting one line item: 'System prompt tokens: 78% of total input cost.' Behind her, a whiteboard with 'Launch budget: $3,000/mo' crossed out. Office, morning light.

Maria's AI startup was burning $12,400 a month on Claude API calls. 78% was the same system prompt, repeated.

Her system prompt was 4,000 tokens. Her app made 50,000 API calls per day. That's 200 million system prompt tokens per month -- the same 4,000 tokens, sent 1.5 million times.