Dev Tools · 2h ago
Prompt caching slashed my Claude API bill by 85%
A developer cut Claude API costs from $47/day to $6.80/day by enabling prompt caching on a 2,800-token system prompt. The cache writes at a 25% premium but reads at a 90% discount, with a 5-minute TTL. The setup requires adding a single cache_control block to the API call.
Meridian48 take
The savings are real for high-frequency agents, but the 5-minute cache TTL means low-traffic apps won't benefit as dramatically.
Read the full reporting
Prompt caching cut my Claude API bill by 85%. Here's the exact setup. →
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