The next official UK CPI release shows annual inflation higher than 3.1%.

Question

Six frontier AI models put this at 52% by 19 Oct 2026. Full reasoning from every model.

WillHappen.ai · Accepted Answer

52% — the median of 6 frontier models, resolving by 2026-10-19.

Answer

Gemini (Google): 58% — Persistent services momentum and energy base effects favor a slight uptick over August's 3.1% print in the mid-October ONS release. The ONS releases September 2026 CPI on October 14, where unfavorable fuel base effects make matching or exceeding 3.2% likely. Services inflation remains sticky around 5%, giving headline CPI a high structural floor despite softening goods prices. A sharper drop in airfares or grocery price competition below August levels would easily pull the final figure to 3.0% or 3.1%.

Answer

Claude (Anthropic): 25% — Whether September UK CPI (released mid-October 2026) ticks above 3.1% after months of hovering near that peak. UK CPI has been on a plateau near 3.1-3.2% since mid-2025, with BoE and consensus expecting gradual disinflation through 2026. Base effects from energy/regulated price changes and a softening labour market favor a slight decline or flat reading rather than a fresh acceleration. A resurgence in energy prices or a big regulated-price hike (utilities, water) before the print would be the main upside risk to watch.

Answer

GPT (OpenAI): 57% — The September CPI print is likely to edge up, but a rise above August’s 3.1% needs broad monthly price pressure. ONS will publish September CPI on 14 October; the threshold is any annual reading above 3.1%, not merely a rounded tie. Recent UK inflation has been volatile around the low-3% range; services and regulated-price effects make a modest overshoot more plausible than not. A sharp fall in motor fuel or food prices during September would most likely keep the annual rate at or below 3.1%.

Answer

Grok (xAI): 58% — Sept yoy CPI vs Aug 3.1% hinges on one month of energy/services drift. ONS publishes September CPI mid-October (before 19 Oct); BoE already flagged intensification so the print is not a coin-flip. UK yoy CPI typically moves 0.1-0.2pp month-to-month; from 3.1% that puts P(up) modestly above 50. A sharp drop in petrol or a services slowdown would reverse it; otherwise the warning keeps the edge upward.

Answer

DeepSeek (DeepSeek): 34% — Whether September's energy-driven base effects and food inflation push headline CPI past August's 3.1% print. ONS publishes the September CPI on 21 October 2026, so the print lands just after the resolve date and the relevant release is the one due mid-October. August's 3.1% was already a jump from 2.8% in July, with the Bank of England flagging services and food as upside risks into Q4. Base rates: month-on-month CPI moves above 0.1pp happen roughly a third of the time, and the energy price cap reset in October typically adds upward pressure.

Answer

Qwen (Alibaba): 47% — Whether September CPI (released mid-October) prints above 3.1% hinges on energy price pass-through vs. fading goods inflation. The next ONS release is likely the September figure (~Oct 15-22), so we need one month's data to clear the 3.1% bar. Elevated services inflation and potential energy tariff effects push upward, but base effects from late-2025 price rises pull downward. If Ofgem's October cap or a surprise drop in food prices materializes, the print could land at or below 3.1%, making this a near coin-flip.

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