Side by side OpenChainBench measurements. Identical layout, no editorial verdict, the live data leads. Each panel surfaces the aggregate plus the chain and region breakdowns when the underlying bench exposes them, straight from the Prometheus queries that drive the parent benchmark pages.
CFTC-regulated US prediction market exchange. REST trade API (trade-api/v2) with documented per-tier rate limits; the market data WebSocket requires authentication.
Codex Kalshi
Trails177 ms
Kalshi
Leads127 ms
Per region
| Region | Codex Kalshi | Kalshi |
|---|---|---|
| US East | 89 ms | 19 ms |
| EU West | 200 ms | 126 ms |
| Singapore | 204 ms | 328 ms |
A pair is published when all four conditions hold. Both providers run in the same OpenChainBench benchmark for at least seven consecutive days. Each provider has at least 1000 samples in the measurement window. The head to head query has observable third party search demand. Both providers have a public /products/[slug] page on OCB. The full pair ledger is versioned in the public repo so the methodology is externally verifiable.