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

Question

Six frontier AI models put this at 66% by 23 Sept 2026. Full reasoning from every model.

WillHappen.ai · Accepted Answer

66% — the median of 6 frontier models, resolving by 2026-09-23.

Answer

Gemini (Google): 74% — Ueda's board will act given market pricing near 1.25% and global hawkish cues unless yen volatility forces caution. The BOJ meets September 21-22, 2026, and strong market pricing of 1.25% terminal expectations reflects solid inflation dynamics. Central banks rarely defy heavy market-implied hike odds within one week of a decision absent an acute liquidity freeze. A sudden domestic equity crash or sharp yen appreciation before September 22 would be the only trigger prompting a pause.

Answer

Claude (Anthropic): 22% — Depends on whether BOJ delivers a hike at this specific September meeting versus waiting for October/December. BOJ has historically moved gradually and often skips consecutive meetings, preferring October/January windows for policy shifts. Markets pricing 1.25% by quarter-end suggests a hike is expected soon, but timing risk favors a later 2026 meeting over September specifically. A hawkish surprise from Ueda or unexpected yen weakness/inflation data before Sept 23 would raise the odds toward a September move.

Answer

GPT (OpenAI): 63% — It turns on whether wage and inflation data let the BOJ validate market pricing at its September 21–23 meeting. The Policy Board itself can act within a week; no legislative approval or external timetable is required. A September hike is plausible when markets price 1.25% by quarter-end, but the BOJ often waits for fresh wage and CPI confirmation. A weak August CPI or risk-off yen appreciation would most likely push the move to October rather than cancel further tightening.

Answer

Grok (xAI): 68% — Whether the Policy Board votes a 25bp hike at the imminent Sept meeting given market pricing to 1.25%. The meeting occurs within days so the vote is already locked by latest CPI, wages and Ueda’s last remarks. Markets price a move to 1.25% by quarter-end and this is the final scheduled meeting, lifting odds well above the ~25% per-meeting base in a slow hiking cycle. A last-minute yen surge or inflation undershoot would still abort the hike, as BOJ has repeatedly delayed on similar data.

Answer

DeepSeek (DeepSeek): 62% — It hinges on whether the BoJ's September 17-18 meeting delivers the hike markets have already half-priced. The BoJ's September 2026 MPM concludes September 18, so the decision lands five days before this resolves; no other actor can move it. Markets pricing toward 1.25% implies roughly a 60-70% implied probability of a 25bp hike at this meeting, and the BoJ has historically followed market pricing when it is… The base rate for BoJ hikes at meetings where markets price >60% odds is high, but Governor Ueda has repeatedly surprised by holding when wage or yen data disappointed.

Answer

Qwen (Alibaba): 72% — BOJ's path to 1.25% by end of quarter implies a September hike is the most natural delivery point. BOJ has been on a gradual normalization path since March 2024, and markets pricing 1.25% by end-Q3 2026 implies at least one more hike from the current 0.75%. The September meeting (around Sept 18-19) is the last scheduled meeting before the resolution date of Sept 23, making it the only remaining window for this quarter's… Base rate for BOJ delivering when markets are pricing it this tightly is high (~75-80%), though the BOJ has surprised with delays before; a yen spike or global risk-off…

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