▲ MARKETS & ECONOMY 1 WEEK HORIZON RESOLVES 21 SEPT 2026

U.S. headline annual CPI inflation is reported at 3.4% or higher in the September 2026 release.

Investors are monitoring the upcoming consumer-price data to shape interest rate expectations. Resolves if the official headline year-over-year CPI print released the week of September 14, 2026 meets or exceeds 3.4%.

Across 4 frontier models answering independently, the panel thinks this is unlikely: the median is 21%.

They broadly agree, 16 points between GPT at 31% and Claude at 15%.

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.

The statement specifies a 'September 2026 release' of CPI data showing 3.4% or higher, with a deadline of 2026-09-21. The evidence shows the 3.4% figure was reported in the August 2026 CPI release, published on 2026-09-11 (covering data through August). The actual September 2026 CPI data release was scheduled for October 14, 2026, which is after the 2026-09-21 deadline. Therefore, no September 202

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

25 Sept 2026 · 89% mean confidence · dispute this

MODEL BY MODEL

What each one said

  • GPTOpenAI

    Oil and shelter could lift CPI, but reaching 3.4% y/y needs a sizable acceleration from baseline.

    openai/gpt-5.6-terra · asked 14 Sept 2026
    31%
  • DeepSeekDeepSeek

    August 2026 CPI likely near 3.0-3.2%; 3.4% needs energy/food upside surprise

    deepseek/deepseek-v4.1-flash · asked 14 Sept 2026
    22%
  • GeminiGoogle

    Sustained tight monetary policy and anchored expectations make a re-acceleration to 3.4% an upside tail risk.

    google/gemini-3.8-flash · asked 14 Sept 2026
    19%
  • ClaudeAnthropic

    Current CPI trajectory near 2.7-3%, 3.4%+ would require notable acceleration

    anthropic/claude-sonnet-5 · asked 14 Sept 2026
    15%
  • GrokxAI
    no answer this run x-ai/grok-4.6 · asked 14 Sept 2026
    –
  • QwenAlibaba
    no answer this run qwen/qwen3.8-max-0902 · asked 14 Sept 2026
    –

4 of 6 models answered · 16 points between the highest and lowest. None was shown the market price.

WHAT DO YOU THINK?
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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.