
Sonar instrumented 18 pull requests written by a coding agent on its own codebase and published the traces on 1 September. One 800-line PR was billed 156 million tokens for 289,000 tokens of output. 152.8 million of those were cache reads, which means the cost of a file read is set by how early in the session the agent made it.

American models fell from 70 percent of OpenRouter token traffic to about 30 percent in a year, while Chinese open-weight models took the rest. It is a cost story, not a quality story, and real companies are already routing production workloads across the 60 to 90 percent price gap.