Prompt Caching

When does inflating the system prompt actually lower cost per call?

'Prompt caching cuts our bill by 90 percent across the board', what's overclaimed?

A teammate randomized system prompts per user and expects the prompt cache to still help, what's wrong?

Predict the break even read count for Anthropic prompt caching given the 1.25x / 0.1x rates

Rank these chat API cost levers from highest to lowest typical ROI

Estimate the token tax a single tool round trip adds compared with an inline answer

Prompt caching shows up on Anthropic and OpenAI pricing pages, what does it actually do?

Why does an agent loop with 5 tool calls have ~6× the latency of a single completion and how do you mitigate?

Which mitigation has the largest impact on agent loop latency when tool calls are independent?

PremiumHow do Anthropic and…

Which prompt construction pattern is most likely to actually hit the provider's prompt cache?

Decompose the cost of a single API call into its components and explain which dominates.

Predict the total cost of one Claude Sonnet API call with realistic token counts

Your team is paying $40k/month on LLM tokens: most calls share a long system prompt + 8k tokens of few-shot examples. How does prompt caching help and what's the expected savings?

In a production LLM app with a stable system prompt + long retrieved context + variable user query, which part of the prompt becomes cacheable via Anthropic/OpenAI prompt caching?

Which of the following content types belong in the SYSTEM message (not the user message) in a production chat style prompt?