OpenAI resumes US ChatGPT Pro 20x signups by...?

According to the latest prediction market data for the query “OpenAI resumes US ChatGPT Pro 20x signups by...?”, traders have formed a strong consensus.

Currently, October 31, 2026 is dominating the market with an overwhelming 22.5% chance of winning. September 30, 2026 follows in second place at 21%. The betting volume for this specific market has already reached $107.4K, reflecting intense industry interest.

To better assess where each potential outcome stands, the market can be segmented into three distinct trading tiers based on implied probability and contract pricing:

🥇 Tier 1: The Dominant Leader

• October 31, 2026 (22.5%): Currently commanding the highest probability, October 31, 2026 is heavily favored by the order book. Traders looking to back this outcome face a “Buy Yes” contract price of 23¢, signaling a high degree of market conviction. This contract alone has generated $14.5K in volume.

🥈 Tier 2: The Primary Challengers

• September 30, 2026 (21%): Positioned as the most viable alternative, September 30, 2026 maintains a 21% chance of resolving true. Its “Buy Yes” shares currently trade at 21¢.

On September 10, 2026, OpenAI paused new subscriptions and upgrades to the ChatGPT Pro 20x plan.

This market will resolve to "Yes" if OpenAI resumes new subscriptions to the ChatGPT Pro 20x plan for US customers by the specified date, 11:59 PM ET. Otherwise, this market will resolve to "No".

Subscriptions will be considered resumed when that plan is again generally available for purchase by new subscribers in the United States through the company's official channels. The availability of any other plan, including the ChatGPT Pro or Pro 5x plans, will not qualify. Resumption of upgrades for existing ChatGPT subscribers without new sign-ups will not qualify.

A qualifying plan must be the called "Pro 20x" or otherwise confirmed to be the same plan as the ChatGPT Pro 20x Plan by a consensus of credible reporting.

Private access limited to selected users or groups of users, a waitlist, or an invitation will not qualify. A change to the plan's name or price will not affect resolution, provided it remains OpenAI's highest-usage ChatGPT Pro tier. Unavailability in particular states resulting from legal or regulatory requirements will not prevent a "Yes" resolution.

The primary resolution source for this market will be OpenAI's official purchasing channels; however, official communications from the company's representatives or a consensus of credible reporting may also be used.

While human consensus and speculative volume shape the broader prediction market, our quantitative algorithms offer a data-driven counter-perspective. By analyzing fundamental signals, underlying trends and historical distributions, our AI Valuation model calculates an independent “Fair Value” probability for each outcome.

Comparing this Fair Value against the current Trade Value uncovers major disparities — known as the Expected Value (EV) Gap. Contracts with a positive EV Gap represent statistically underpriced outcomes, whereas a negative EV Gap flags a potential market overreaction.

Top AI Alpha & Mispriced Arbitrage Opportunities

Based on the latest data model run, several key contracts stand out with significant deviations:

• The Best Value Play (Highest EV) Our model identifies October 31, 2026 as the premium value opportunity on the board. While the market only assigns it a 22.5% trading probability, our AI’s Fair Value assessment sits at 60% — yielding an impressive +37.5% EV Gap.
• Under-the-Radar Dark Horses Other notable discrepancies include September 30, 2026 (EV Gap: +4.7%). These long-tail opportunities are heavily discounted by the live order books despite stronger statistical backing from our predictive model.