The Bank of Japan raises its policy interest rate at its Sept. 28-29 meeting.

Question

Six frontier AI models put this at 8% by 28 Sept 2026. Full reasoning from every model.

WillHappen.ai · Accepted Answer

8% — the median of 6 frontier models, resolving by 2026-09-28.

Answer

Gemini (Google): 4% — The BOJ virtually never executes consecutive rate hikes within an eleven-day window after setting multi-decade highs. Ueda's board requires months to assess macro fallout and financial conditions before committing to sequential tightening. Central bank base rates for back-to-back rate hikes ten days apart are practically zero outside of acute currency defense. A massive, sudden yen collapse threatening systemic stability before Sept. 28 would be the only trigger for an emergency hike.

Answer

Claude (Anthropic): 13% — BOJ almost never hikes twice in consecutive meetings ten days apart; a follow-up hike this fast is very unlikely. The BOJ just hiked on Sept 18 to a 31-year high, and central banks rarely stack hikes within days absent a shock. Base rate for consecutive-meeting hikes at BOJ is near zero historically, favoring a pause to assess market and yen impact. Change my mind: sudden yen collapse or inflation surprise forcing emergency action before Sept 29.

Answer

GPT (OpenAI): 7% — A second hike just 10 days after a move to a 31-year high would require an abrupt inflation or market shock. The Policy Board has already acted on Sept. 18; it would need to reverse its usual wait-and-assess cadence by Sept. 28-29. Major central banks rarely deliver back-to-back unscheduled-close hikes absent a currency, inflation, or financial-stability emergency. Odds would rise sharply if yen depreciation or inflation data before Sept. 28 forced officials to signal emergency tightening.

Answer

Grok (xAI): 2% — A second hike 10 days after Sept 18 is unprecedented and operationally implausible. BOJ just raised to a 31-year high on 18 Sep; the 28-29 Sep gathering cannot be a scheduled policy meeting that would reverse that. Consecutive hikes 10 days apart have never occurred; the board would need new data and a vote that cannot materialize in one week. Only an emergency yen collapse or inflation spike would change this, neither of which is visible by 21 Sep.

Answer

DeepSeek (DeepSeek): 8% — The BOJ just hiked on Sept. 18; a second hike eleven days later would be unprecedented for the bank. The BOJ has never delivered consecutive hikes at back-to-back meetings; it typically waits 3-6 months to assess wage and price pass-through. Governor Ueda has repeatedly stressed a 'cautious and gradual' pace, and the Sept. 18 hike already moved the policy rate to a 31-year high. The only thing that would flip this is a yen collapse or inflation shock between now and Sept. 29, which is a very narrow window for new data.

Answer

Qwen (Alibaba): 38% — BOJ just hiked to a 31-year high on Sept. 18; back-to-back hikes are rare but not unheard of given yen weakness. The BOJ hiked to 0.75% on Sept. 18; consecutive hikes at successive meetings have occurred only a handful of times in BOJ history, typically during aggressive tightening… Governor Ueda has signaled a gradual, data-dependent path; a 10-day gap between meetings gives little new data to justify another move so soon. The main upside risk is yen depreciation past 160/USD or a sharp inflation surprise, which could force the board's hand—watch USD/JPY in the week before the meeting.

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