The Bank of Japan raises its policy rate at its December 2026 meeting.

Question

Six frontier AI models put this at 58% by 4 Feb 2027. Full reasoning from every model.

WillHappen.ai · Accepted Answer

58% — the median of 6 frontier models, resolving by 2027-02-04.

Answer

Gemini (Google): 58% — BoJ action hinges on yen weakness and firm wage-price momentum overriding political pushback against higher borrowing costs. Governor Ueda and the Policy Board meet Dec 18-19 and have primed markets by explicitly lifting the FY2027 inflation forecast. Base rate of hikes at 'live' meetings following explicit outlook upgrades is roughly 60%, with domestic political pressure being the main drag. A sharp yen rally or a sudden softening in preliminary Shunto wage signals before mid-December would instantly derail a move.

Answer

Claude (Anthropic): 32% — Depends on whether inflation and wage data through early December 2026 stay strong enough to justify another hike. BoJ has hiked gradually (2024-2025) when inflation persisted above target, showing willingness but caution on timing. Upgraded FY2027 inflation outlook signals hawkish lean, but BoJ often prefers January meetings for major policy shifts after year-end data. Yen weakness or global market volatility could either push BoJ to act sooner or make them wait for more confirmation.

Answer

GPT (OpenAI): 63% — It turns on whether wage and inflation data by mid-December preserve the BoJ’s confidence in durable 2% inflation. The Policy Board must vote for a move at its December meeting; its upgraded FY2027 outlook signals a meaningful bias to tighten. Central banks commonly wait for wage, core-price, and market-stability confirmation, making a one-meeting delay plausible despite hawkish guidance. A sharp yen rise, softer November inflation, or weak wage indicators would most likely push action into January 2027.

Answer

Grok (xAI): 38% — Whether late-Nov wage/CPI prints confirm the upgraded FY2027 inflation path. BoJ decides 18-19 Dec after Nov data; they just skipped a hike despite the upgrade. Hikes occur at only ~30% of meetings they flag as live, given 2024-25 caution. A yen slide past 160 or Fed pause would most raise the odds.

Answer

DeepSeek (DeepSeek): 62% — It hinges on whether December's shunto wage signals and yen weakness let Ueda move before the FY2027 outlook hardens. The BoJ has hiked twice since 2024 and its upgraded FY2027 inflation forecast keeps a December move live, so the bar is lower than a cold start. Ueda needs Q3 GDP (early Dec) and the December Tankan to confirm domestic momentum; a weak print or a yen rally would push the hike to January. Base rate for a BoJ hike at a meeting where it has flagged optionality is roughly 55-65%; this case sits at the upper end given yen weakness and wage momentum.

Answer

Qwen (Alibaba): 57% — BoJ upgraded inflation outlook and left the door open, but their historical caution and data-dependence make a delay plausible. The upgraded FY2027 inflation outlook removes a key precondition the BoJ has cited for holding, but 'leaving open the possibility' is weaker than the 'conditions are… The BoJ has delayed expected hikes multiple times (Aug 2024, mid-2025) when external risks or market volatility emerged; six weeks of data (Nov CPI, spring wage… A strong November CPI print or continued yen weakness would push this above 70; a global risk-off event or soft wage data would drop it below 40.

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