Japan's headline August CPI rises to at least 2.0% year-on-year.
Consensus forecasts project headline inflation will edge up to 2.0% ahead of the BOJ rate decision. Resolves yes if the official statistical release reports 2.0% or higher.
Across 6 frontier models answering independently, the panel leans yes: the median is 72%.
They broadly agree, 25 points between Gemini at 83% and Claude at 58%.
It did not happen. Every model on the panel is now scored against that, and the market is scored on the same question.
It didn't happen.
Reuters and multiple other sources report Japan's headline August 2026 CPI came in at 1.9% year-on-year, not at least 2.0%. Core CPI (ex-fresh food) was 1.7%, and the ex-fresh-food-and-energy measure was 1.9%. No source found supports headline CPI reaching 2.0% or higher.
Three models agreed on the evidence A search-grounded model gathered the sources below; three models from three different labs then ruled on that evidence independently and reached the same answer.
- Claudenot happenedcontradicting evidence
- GPTnot happenedcontradicting evidence
- Gemininot happenedcontradicting evidence
- Japan's core inflation holds near BOJ's target - Reuters
- Japan Inflation remains at 1.9% in Aug; core price growth slows to 1.7%
- Japan CPI Consumer Price Index 2026 | countryeconomy.com
- Japan Inflation Rate
- Japan August-26 CPI Inflation Report - by Gianluca Benigno
- Japan's wholesale inflation stays elevated in August, boosts case for ra…
What each one said
-
GeminiGoogle
Tokyo CPI already trended above 2.0% and consensus strongly anchors at or above 2.0%.
google/gemini-3.8-flash · asked 14 Sept 202683% -
QwenAlibaba
Consensus already at 2.0%; headline CPI has been sticky near that level, upside risk from yen weakness.
qwen/qwen3.8-max-0902 · asked 14 Sept 202682% -
GPTOpenAI
Consensus is at the threshold, and Japan’s headline CPI has recently been near or above 2%.
openai/gpt-5.6-terra · asked 14 Sept 202672% -
DeepSeekDeepSeek
Consensus at 2.0% and Japan inflation has run near/above target; small miss risk only.
deepseek/deepseek-v4.1-flash · asked 14 Sept 202672% -
ClaudeAnthropic
Consensus exactly at threshold; small forecast errors could push either way
anthropic/claude-sonnet-5 · asked 14 Sept 202658% -
GrokxAI
Consensus at exactly 2.0%; typical 0.1pp print error makes >=2.0 slightly more likely than not.
x-ai/grok-4.6 · asked 14 Sept 202658%
6 of 6 models answered · 25 points between the highest and lowest. None was shown the market price.
Question sourced from a news sweep on 14 Sept 2026. Forecast by google/gemini-3.8-flash, anthropic/claude-sonnet-5, openai/gpt-5.6-terra, x-ai/grok-4.6, deepseek/deepseek-v4.1-flash, qwen/qwen3.8-max-0902 via OpenRouter.