Token Price Index
TPI tracks the USD price of one million AI inference tokens.
US Token Price Index
$8.73
TPI/ million tokens
Last updated May 18, 2026, 07:14 AM
China Token Price Index
$0.90
TPI/ million tokens
Last updated May 18, 2026, 07:14 AM
Global Token Price Index
$5.91
TPI/ million tokens
Last updated May 18, 2026, 07:14 AM
US TPI overview
TPI is weighted average USD per million tokens.
Model Eligibility
Included models need observable API pricing, stable availability, current mainline status, and commercial relevance.
Weighting Method
Weight rules are public. Exact live constituent weights are summarized periodically rather than exposed as a free real-time data feed.
Watchlist First
New models are reviewed before entering a basket. Source updates trigger review rather than automatic constituent changes.
Why This Index Exists
AI token prices are becoming an input cost for software, research, operations, and automation. Token Price Index turns those prices into transparent public indices so people can observe how inference affordability changes over time.