The title says 'Denver', but the resolution rules explicitly specify the data source as Buckley Space Force Base Station (KBKF) in Aurora, rather than the widely used Denver International Airport (KDEN). Temperatures between these locations can differ slightly but critically, creating a notable trap for careless traders.

Predicting the specific temperature range (down to a 2-degree Fahrenheit bucket) for a particular city on a given day is a relatively niche and novel segment in prediction markets. While weather forecasts are everyday matters, this high-precision short-term climate betting isn't as mainstream as elections or asset prices.

April 23, 2026 - April 26, 2026: Anthropic's price rebounded from 69.5c to 92.5c, while OpenAI's price plummeted from 27.8c down to 7.05c. This occurred because market hype for a surprise OpenAI model release before month-end completely cooled off, confirming Anthropic's high probability of maintaining its lead at settlement. April 20, 2026 - April 23, 2026: Anthropic's price dropped from 93.5c to 74c, while OpenAI's price surged from 6.4c to a peak of 27.8c before settling at 21.3c. This was driven by intensified market speculation that OpenAI might release or blind-test a new model before the resolution date. April 16, 2026 - April 18, 2026: No option experienced a price fluctuation exceeding 10 cents. As the expiration date approaches, the market is converging towards an Anthropic victory with extremely low volatility. April 9, 2026 - April 11, 2026: No option experienced a price fluctuation exceeding 10 cents. The market corrected its earlier irrational pricing, firmly establishing Anthropic as the overwhelming favorite.