Recent hotter-than-expected October 2026 CPI data, with headline prices rising 0.4% month-over-month and core up 0.3%, has elevated market-implied odds of further tightening and created the near-even split between a 25 basis point hike and no change at the January 2027 FOMC. Traders are weighing persistent price pressures in shelter and food against the current 3.75–4.00% target range and the high probability of a December 2026 rate increase already priced into futures. The closely contested January outcome reflects uncertainty over whether inflation will moderate after the December move or require additional policy adjustment, with the next key data releases and December dot plot likely to sharpen the distinction between the leading probabilities.