An index is a published number the market prices against — a benchmark for a barrel of oil, not a dashboard of your own bill. The TKX is that number for AI capability. It grounds quality to cost so you can value one model against another. The index is live. So is the calculator.
As of 2026-09-13, the TKX is 102.1, meaning a unit of AI capability is at a premium to the 2026-08-04 baseline of 100.
Cite the print: GET /v1/index/tkx · Methodology
As of 2026-09-08, TKX membership: GLM-5.3 Flash and Gemini 3.8 Flash added. Composition effect 11.57.
An index is one published number that makes unlike things comparable. The TKX does that for AI tokens. It scores quality and cost across reasoning, code, extraction, and classification, and puts every model on one scale. Above 100 means a unit of AI capability is at a premium to that baseline. Below 100 means it is lower than at that baseline.