The UK Consumer Prices Index for food and non-alcoholic beverages registers negative annual inflation before 2

Question

Six frontier AI models put this at 30% by 30 Sept 2029. Full reasoning from every model.

WillHappen.ai · Accepted Answer

30% — the median of 6 frontier models, resolving by 2029-09-30.

Answer

Gemini (Google): 28% — Outright UK food deflation requires global agricultural commodity drops and supermarket price wars outpacing sticky labor costs. UK food CPI experienced protracted negative annual rates in 2014 to 2016, but nominal food prices usually plateau rather than drop. With domestic wage growth and post-Brexit supply frictions keeping retail overheads elevated, year-on-year drops face strong resistance. Sustained bumper global grain harvests alongside aggressive discounting by Aldi and Lidl across 2027 would push this over 50%.

Answer

Claude (Anthropic): 5% — Outright deflation in UK food CPI has not happened in decades and requires a demand/supply shock, unlikely by 2029. UK food CPI inflation has stayed positive since the 1990s, with only brief near-zero readings, never sustained negative y/y. Current trajectory shows food inflation easing from 2022-23 peaks toward 2-3%, not crossing into deflation. A severe commodity price collapse or demand crash would be needed, and no such shock is currently visible in forecasts through 2029.

Answer

GPT (OpenAI): 63% — It mainly turns on whether global food, energy and sterling conditions produce a broad retail-price reset by 2027-28. ONS CPI food inflation has repeatedly fallen sharply after shocks, but outright annual deflation is less common than mere disinflation. Retailers and suppliers can pass through cheaper commodities quickly, while wage, packaging and distribution costs resist sustained cuts. A renewed energy or crop shock would materially lower the odds; weak demand plus a stronger pound would raise them.

Answer

Grok (xAI): 31% — Whether UK food CPI YoY turns negative in any month through Dec 2027. ONS publishes the series monthly; the last negative spell was 2015-16 after a commodity slump. From a ~2% starting point in late 2026 it needs a 2pp+ undershoot versus year-earlier levels. A harvest glut or sharp sterling rally would lift the odds most; otherwise the 20-year base rate in a 15-month window is low.

Answer

DeepSeek (DeepSeek): 22% — Turns on whether a fresh energy or FX shock hits before 2028, since food CPI rarely falls without one. ONS food CPI has fallen year-on-year only in 2009-10, 2014-16 and briefly 2018, roughly 3 of the last 25 years, so the base rate is near 12%. Deflation needs sustained falls in farm-gate, energy and sterling import costs; the BoE expects food inflation near 2-3% through 2027, above zero. A deep global recession or a sharp sterling appreciation would be the clearest trigger, but neither is in current forecasts.

Answer

Qwen (Alibaba): 38% — This turns on whether a commodity shock or demand collapse hits UK food prices hard enough to push YoY negative within ~3 years. UK food CPI has registered negative YoY only rarely—briefly in 2014-2015 (~-0.5%)—making the base rate for any 3-year window roughly 10-15%. Current trajectory from late 2026 likely shows food inflation at 2-4% YoY; reaching negative requires either a global commodity crash or a sharp sterling appreciation… A repeat of the 2014-15 pattern (oil crash + supermarket price wars) is the most plausible path; a global recession or agricultural oversupply shock would be the key…

The UK Consumer Prices Index for food and non-alcoholic beverages registers negative annual inflation before 2028.

What each one said

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