Will OpenAI have the best AI model at the end of September 2026?
Not enough price history for this range yet.
Source: ProbCast snapshots (Polymarket)
This market has resolved. The final Polymarket price was 0.1%.
- Final market price
- 0.1%
- Event deadline
- September 30, 2026 at 12:00 PM ET
- Venue status
- resolved
- Resolution source
- arena.ai
ProbCast Reliability Summary
Will OpenAI have the best AI model at the end of September 2026? The final Polymarket price was 0.1%. This market has resolved. The final Polymarket price was 0.1%.
- Market data as of
- September 30, 2026 at 2:15 PM ET
- ProbCast assessment generated
- October 20, 2026 at 3:43 PM ET
- Source
- Polymarket
- Event deadline
- September 30, 2026 at 12:00 PM ET
- Market status
- Resolved
- Data updated
- 20d ago
What this market actually measures
This market will resolve according to the company which owns the model which has the highest arena rank based on the arena.ai Text Arena (Overall) when the table under the "Leaderboard" tab is checked on September 30, 2026, 12:00 PM ET. Results from the "Rank" column under the "Text Arena | Overall" Leaderboard tab at https://arena.ai/leaderboard/text/overall-no-style-control with style control off (Adjustments: None…
This summary shows the opening of the venue's official rules. ProbCast has not yet generated an independent plain-English interpretation for this contract — review the full rules before relying on it.
View full official resolution rules
This market will resolve according to the company which owns the model which has the highest arena rank based on the arena.ai Text Arena (Overall) when the table under the "Leaderboard" tab is checked on September 30, 2026, 12:00 PM ET. Results from the "Rank" column under the "Text Arena | Overall" Leaderboard tab at https://arena.ai/leaderboard/text/overall-no-style-control with style control off (Adjustments: None) and filtered for "Models" will be used to resolve this market. Models will be ordered primarily by their leaderboard rank at the market’s check time. If two or more models are tied on rank, they will be ordered by their Arena score, including any underlying, unrounded, granular values reflected in the data below the leaderboard. If a tie still remains, alphabetical order of company names as listed in this market group will be used as a final tiebreaker (e.g., if the two models are tied by exact arena score, “Google” would be ranked ahead of “SpaceXAI”). This market will resolve based on the company that occupies first place under this ranking. The resolution source for this market is the arena.ai Text Arena (Overall). If this resolution source is unavailable at check time, this market will remain open until the leaderboard comes back online and will resolve based on the first check after it becomes available. If it becomes permanently unavailable, this market will resolve to "Other".
Resolution source: arena.ai