The latest weekly market share report from AI model gateway OpenRouter revealed a slight decline in DeepSeek's request volume, triggering a sharp, widespread downward revision in prediction markets for the company's performance this week. In trading on Tuesday, September 29, 2026, the Kalshi contract for DeepSeek's share to exceed 23.7% plummeted 69 percentage points, falling from a pre-data high of 94% to 25%.
The move came after OpenRouter's data for the week of September 21 was released, showing DeepSeek with a strong 24.4% share of requests but also a 2% week-over-week decline. The repricing across all related contracts suggests traders interpreted the negative growth figure as a sign of potential deceleration, pulling back from extremely bullish expectations for the current week, which ends October 5.
Distribution Analysis
The negative repricing was comprehensive, with every contract in the market declining on significant volume. The probability mass, which had been concentrated on outcomes above 24%, has now shifted lower, with the market consensus now centered in the 22-23% range.
| Outcome | Current Prob | Change | Volume |
|---|---|---|---|
| Above 22.0% | 69% | -7.0pp | 3,146 |
| Above 23.0% | 42% | -9.0pp | 3,404 |
| Above 23.7% | 25% | -69.0pp | 5,206 |
| Above 24.0% | 18% | -28.0pp | 1,702 |
| Above 24.2% | 15% | -10.0pp | 1,700 |
| Above 24.4% | 13% | -9.0pp | 1,705 |
| Above 24.7% | 8% | -9.0pp | 2,720 |
| Above 25.5% | 8% | -4.0pp | 1,229 |
| Above 26.7% | 2% | -1.0pp | 1,120 |
Net: All 9 contracts declined on 21,932 total volume, shifting the implied consensus range for DeepSeek's weekly share lower.
What's Driving the Shift
The sell-off appears driven by a re-calibration of growth expectations following the release of new, albeit mixed, fundamental data from the market's settlement source.
Negative Growth Signal: The primary catalyst was the weekly data from OpenRouter. While DeepSeek's 24.4% market share for the week ending September 21 was a strong absolute number, the accompanying metric showed a 2% decline in requests compared to the prior week. For a market priced for continued aggressive growth, this sign of a potential plateau or slowdown was enough to trigger a significant re-evaluation of the outlook for the current week.
Overly Bullish Positioning: Prediction markets for DeepSeek's performance in the prior week were extremely optimistic. One market on Kalshi had priced a 97% probability of exceeding 23.0% for the week of September 21. The actual result of 24.4% validated that confidence. However, it appears traders extrapolated that strong growth into the current week, with contracts like "Above 23.7%" reaching 94% before being confronted with the new data showing a reversal in request volume.
Rising Competition: The OpenRouter data that showed a dip for DeepSeek also revealed gains for competitors. In the same weekly period, Google's share of requests grew 12%, OpenAI's rose 6%, and Xiaomi's jumped 32%. This context suggests DeepSeek's slight decline occurred in a competitive environment where other major labs were gaining traction, adding weight to the market's bearish reaction.
Market Context
This prediction market focuses on a specific, developer-centric metric: request share on OpenRouter, an API gateway popular for testing and deploying various AI models. This metric is a strong indicator of developer and application-level adoption, where DeepSeek's aggressive pricing gives it a major advantage.
This developer-focused ecosystem stands in contrast to the broader consumer chatbot market. According to a September 2026 report, DeepSeek's share of the U.S. consumer chatbot market is estimated at just 0.4%. Other sources measuring general web traffic place its share higher but still in the single digits, well below leaders like ChatGPT and Google Gemini. The high share on OpenRouter underscores the company's successful strategy of winning the "volume economy" among developers building applications, even as it holds a smaller footprint in direct-to-consumer use.
What to Watch
This market is scheduled to resolve on Monday, October 5, 2026, based on the weekly market share data published by OpenRouter for the week beginning September 28. The settlement value will be rounded to one decimal place. Traders will be monitoring for any further data releases or major announcements from DeepSeek and its key competitors that could influence developer usage and token consumption through the end of the week.
