The European Central Bank raises policy rates at its December 2026 meeting.

Question

Six frontier AI models put this at 26% by 4 Feb 2027. Full reasoning from every model.

WillHappen.ai · Accepted Answer

26% — the median of 6 frontier models, resolving by 2027-02-04.

Answer

Gemini (Google): 27% — A December rate hike requires a sharp late-year core inflation spike overcoming sluggish eurozone GDP growth. Governing Council rate increases with only weeks to prep markets historically require consensus or severe inflation surprises. Eurozone growth remains fragile, making a pause at the December 17 meeting far more palatable to centrist council members. A flash November HICP printing significantly above 2.8% core would immediately flip expectations toward an active hike.

Answer

Claude (Anthropic): 12% — ECB would need a clear inflation resurgence by December 2026 to reverse its easing/hold stance. ECB rates have been on hold near 2% through 2026 with no signaled hiking bias as of the question date. Central banks rarely reverse course to hike after a long easing cycle without a sharp inflation surprise materializing first. Watch October-November 2026 inflation prints and ECB communications; a sustained upside surprise would be the main trigger to change this.

Answer

GPT (OpenAI): 18% — It turns on whether euro-area inflation reaccelerates enough to reverse the ECB’s likely easing-to-hold posture within weeks. The Governing Council must see December staff projections and vote for a hike at its final 2026 policy meeting. Rate changes at a specific meeting are uncommon; absent a fresh inflation shock, central banks usually hold rather than reverse course quickly. A sharp November inflation surprise or wage-price acceleration would materially raise the odds before the December decision.

Answer

Grok (xAI): 37% — Whether Nov/Dec 2026 euro-area inflation prints force a majority on the Governing Council to hike at the 17 Dec meeting. The Council must vote on 17 Dec; a hike needs a clear majority after the 29 Oct pause and only five weeks of new data. Base rate for a hike at any given meeting once a cycle has paused is ~15-20%; official signalling lifts it but still leaves it below even odds. A flash HICP print well above 2.5% in late November would be the single most decisive shift; otherwise markets and staff projections keep the bar high.

Answer

DeepSeek (DeepSeek): 34% — It hinges on whether euro-area core inflation is still above 2% and rising when the December 2026 Governing Council meets. The ECB's deposit rate sits near 2% after 2025 cuts, so a hike requires a genuine inflation re-acceleration, not just a pause. Governing Council must see Q3 2026 core inflation and staff projections in early December; a single hot print likely isn't enough. Base rate for the ECB hiking within a year of cutting is low, but 2026 energy-base effects and fiscal easing push this above it.

Answer

Qwen (Alibaba): 24% — ECB rarely hikes without explicit forward guidance weeks prior; 'on the table' is weaker language than a committed signal. ECB has hiked at roughly 6-8% of meetings historically; even with inflation concerns flagged, a hike requires Governing Council consensus and clear pre-communication. December meetings coincide with updated staff projections, making it a natural inflection point, but one month of signaling is short for a hike unless November HICP… A hawkish November inflation print above 3% would be the single development most likely to push this from 'on the table' to committed action.

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