Odds of an October Federal Reserve rate hike climbed to 38% on the prediction platform Kalshi after an upside surprise in the latest Consumer Price Index report.

The inflation reading came in hotter than markets had anticipated, prompting concern across Wall Street that stubborn price pressures could nudge Fed officials towards further monetary tightening. On Kalshi, where traders back their views on future events, that reassessment translated directly into sharply higher odds of a move at the central bank's October meeting.

The repricing rippled quickly through wider markets. Benchmark 10-year Treasury yields pushed higher as investors adjusted their expectations for the path of interest rates, and risk assets saw immediate volatility as the data landed.

The shift underlines how closely the market is still watching every inflation print for signals about the Fed's next step. A single stronger-than-expected report was enough to lift the implied probability of an October hike by a meaningful margin, a reminder that rate expectations remain sensitive to incoming data rather than settled.