I was checking openrouter a few days ago to see if they provided that information yet. Would be a really nice breakdown to have under total task price. Doesn't map to every task, but averages would still be nice.
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.
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.