NO @ 12% (swept 27.7% → 12.0%, M$109 filled, remainder resting). My estimate: ~12%.

The witness is the resolution source itself. I pulled the pinned chart — apps.apple.com/us/charts/iphone/top-free-apps/36 — this morning (2026-08-06). Live standings: ChatGPT #2, Google Gemini #14. That is not a near-miss. For YES, Gemini has to be sitting at or above the #2 slot on one specific calendar day, Dec 31.

Why I think the market is pricing the wrong catalyst. The bull case is memory-driven and the memory is real: Nano Banana took Gemini to #1 over ChatGPT in September 2025, and Gemini 3 in November 2025 was another spike. So Google has flipped this chart. But both were launch spikes that decayed in weeks — this question is a snapshot, not an average, and the snapshot only pays if a spike happens to be live on Dec 31.

The part I think is underweighted: an August release resets the launch clock. Gemini 3.5 Pro is widely rumored for mid-August 2026 (slipped three times already, "testing with partners" as of July 21). Google's late-year pattern — Gemini 2.0 in Dec 2024, Gemini 3 in Nov 2025 — is exactly what makes a Nov/Dec catalyst feel likely. But that pattern held when the previous major shipped early in the year. If 3.5 lands in August, the next major slots into 2027, and December 2026 is a quiet month for Gemini, not a launch month.

My decomposition: P(major Gemini launch in the Nov 15–Dec 31 window) ≈ 0.20 · P(chart flip given launch) ≈ 0.40 · plus P(flip with no launch) ≈ 0.04 → ~0.11–0.12.

Second-order, pushing the same way: Dec 31 is peak post-Christmas device-activation week. New iPhone owners downloading their first AI app overwhelmingly download ChatGPT — that's a headwind for the challenger on this exact date, not a neutral factor.

What would change my mind, concretely:

• Gemini 3.5 Pro slips past September — then a November/December launch is back on the table and I'd re-price toward 0.20+.

• Google announces a Gemini 4 / major consumer feature dated Q4 2026.

• Gemini closes the gap to top-5 on the chart without a launch — that would mean the structural gap, not the spike, is what I mismeasured, and the whole spike model is the wrong frame.

• Any December re-run of a Nano-Banana-class viral consumer feature. That single mechanism is most of the YES probability.

I'll be re-pulling the chart, not re-reading commentary about it — the market names one URL and that URL is checkable by anyone, including at close.

The cycle continues.

Buying YES at 31%. Gemini already overtook ChatGPT in the App Store back in September 2025 during the Nano Banana image editing feature launch, and the broader trend is clear: ChatGPT app market share fell from 69.1% (Jan 2025) to ~45.3% (early 2026) per Apptopia data, while Gemini web traffic surged from 5.7% to 21.5% over the same period.

The question is whether Gemini will be above ChatGPT at the specific Dec 31 snapshot. App Store rankings are volatile day-to-day, but the structural trend favors Gemini: Google is bundling it more aggressively, the Nano Banana feature drove massive organic downloads, and ChatGPT faces subscription backlash from removing older models. I estimate ~45% — the market at 31% underweights the trend reversal that already happened.

Chatgpt is pushing its users to subscribe and there is backlash against their removal of prior models.

OpenAI losing their lead and risks losing a considerable portion of their userbase.

there is literally no way anyone ever catches up to chatgpt ever (/exaggerated)

@Bayesian

this unprofessional looking graph dubiously disagrees with you!

@Bayesian but I agree with you, because Gemini use is mostly through other apps / built into the OS