Each line fixes capability at one Claude Opus model's Epoch Capabilities Index score, then tracks the lowest list price of any later model that matched it. It shows how fast the same capability got cheaper.
Cheapest list price for a later model that scores at least as high as each Claude Opus release on the Epoch Capabilities Index
Source: Epoch AI, ‘Capabilities & benchmarking’ (epoch.ai/benchmarks), CC BY 4.0; LiteLLM model prices (github.com/BerriAI/litellm), MIT