The European Central Bank leaves key interest rates unchanged at its next policy meeting.

Question

Six frontier AI models put this at 73% by 29 Jan 2027. Full reasoning from every model.

WillHappen.ai · Accepted Answer

73% — the median of 6 frontier models, resolving by 2027-01-29.

Answer

Gemini (Google): 74% — The Governing Council favors policy inertia when energy volatility clouds quarterly staff macro projections due in December. ECB typically holds steady for at least two consecutive meetings after declaring a pause unless a massive supply shock hits. The December 2026 meeting relies on new projections, and policymakers historically avoid resuming hikes without sustained wage acceleration. A sharp headline HICP spike above 3.5% in preliminary November data is the primary catalyst that would force an immediate hike.

Answer

Claude (Anthropic): 70% — ECB likely holds again in December 2026 given its October pause and lingering energy-driven inflation risk. ECB explicitly paused in October 2026 citing inflation risk, signaling a cautious wait-and-see stance into the next meeting. Central banks rarely reverse a fresh pause within one meeting unless inflation or growth data shift sharply, which is the base rate anchor. Watch December/January inflation prints and energy price swings; a sharp disinflation surprise could trigger a cut instead of a hold.

Answer

GPT (OpenAI): 72% — The December Governing Council must judge whether energy inflation is persistent enough to outweigh weak growth. The ECB Governing Council next meets on 17 December 2026, giving policymakers only seven weeks of post-pause data. At pauses, the ECB has commonly held for multiple meetings; a single move requires a material inflation or activity surprise. A sharp oil/gas shock feeding core inflation or a major euro-area growth slump would most likely force a move.

Answer

Grok (xAI): 72% — Hold after an energy-risk pause is the default unless inflation or growth data shift sharply in six weeks. October 29 pause cited energy inflation; next GC is 17 Dec 2026, only six weeks of new prints. Post-pause holds occurred in 8 of last 11 similar ECB cycles; energy shocks rarely reverse that fast. A surprise 0.3 pp drop in core HICP or a 20 % oil collapse would flip the call; neither is priced.

Answer

DeepSeek (DeepSeek): 78% — The incoming economic data and ECB's forward guidance regarding inflation persistence. The ECB has shown a clear pattern of data dependency, making a pause likely given recent energy stabilization. The base rate for holding rates steady in a cautious cycle is relatively high, but inflation persistence introduces downside risk. A sharp, unexpected rise in core services inflation above 3.5% would force a hawkish pivot before January.

Answer

Qwen (Alibaba): 74% — ECB just paused on energy uncertainty; six weeks is too short for that thesis to resolve, making a consecutive hold the modal outcome. When the ECB pauses after a rate move, it holds at the next meeting roughly 75-80% of the time (2019, 2023 precedents). Energy-driven inflation risks cited in October are unlikely to materially shift by a December meeting, removing the trigger for a move. A surprise would require a sharp energy price collapse or a hawkish inflation print in November data—possible but not base case.

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