Kinda wish people break down token usage into input (cache hit), input (cache miss) and output when talking about it. Giving a total 200B tokens number doesn’t help gauge costs.
For Anthropic's reported benchmark numbers for Sonnet 5.5, when running terminal-bench 4.0, they had a comparison between $0.10 and $0.20 cache read for total task cost. That 50% cost reduction resulted in a 20.9-26.2% total cost reduction. Pretty specific though... single benchmark, model, harness, and provider. Cache reads make up ~42-52% of the total cost at the standard $0.20 price.