Best AI on Dec 31, 2026? — Claude priced at 35.7% on Kalshi, down 9.5 points, on $3.3M traded

Claude’s year-end odds retreat

Claude was priced at 35.7% on Kalshi in the market asking which AI will be best on Dec 31, 2026, down 9.5 probability points over 24 hours, according to PredictionBubbles’ supplied market update. Reported traded volume stood at $3.3M.

PredictionBubbles also identified the Claude contract as a category-leading mover on its board. The supplied material does not identify a catalyst for the decline, provide competing AI contracts’ prices or explain the criteria that will determine the winning outcome.

A changing snapshot

The update published Oct 29, 2026, at 7:24 PM ET referenced an Oct. 29, 23:05 UTC crawl, using data read at Oct. 29, 22:47 UTC. That snapshot covered 1,996 ranked markets, with 541 moving at least 1 probability point.

The supplied PredictionBubbles page reflects a later venue-data reading of 29 Oct 2026, 23:17 UTC. It covered 2,007 markets lasting longer than 14 days and reported 529 qualifying movers, with the top 150 displayed. Those board-wide counts belong to different snapshots and should not be treated as simultaneous readings.

According to PredictionBubbles, the board draws prices from Kalshi and Polymarket and refreshes every 15 minutes. It ranks eligible open markets by the absolute size of their 24-hour probability-point change, excluding contracts without a valid day-old comparison. Volume and liquidity provide context but do not affect placement.

What it means for prediction markets

• The decline measures repricing, not a technical verdict. Claude’s 9.5-point fall records a change in traders’ assessment; the supplied reporting does not establish a change in AI performance.
• Volume does not establish market depth. The $3.3M traded figure adds context, but the material does not specify its measurement period or provide order-book liquidity.
• Resolution terms remain essential. Without the contract’s criteria for “best,” the 35.7% price cannot be interpreted as a general measure of Claude’s capabilities.
• Timing matters when comparing readings. The earlier update and later board capture different moments in a feed refreshed every 15 minutes.