// AI news · 2026-11-16 · Dev.to AI
Nine Checks for High Claude API Costs
High Claude API costs often stem from invisible thinking tokens, cache misses due to prompt prefix changes, full history retransmission per turn, and costly cache writes.
Published 2026-11-16 01:33 (Beijing time)Source Dev.to AIAuto-summarised, fact-checked against source
01Summary
Fast mode and model selection also impact pricing. Input tokens are charged at higher rates when not cached or when prompts exceed limits. Large documents and repeated requests increase expenses significantly.
Summarised from the original article by an open-source model, then checked automatically: every number and English name must appear in the source. The original article is authoritative.
02Key points
- Thinking tokens are billed as output even if not displayed, at five times input cost.
- Cache fails to hit due to minor prompt prefix changes, such as timestamps or tool lists.
- Full conversation history is resent on every turn, increasing redundant input costs.
- Cache write costs exceed read costs, especially with infrequent reads.
03Source
Why is my Claude API bill so high? 9 things to check
Dev.to AI · published 2026-11-16 01:33 Beijing time
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