Future Index
Forecast marketsPolymarketOpenUp to date

Will OpenAI’s market cap be between $500B and $750B at market close on IPO day?

Probability

0.4%

very unlikely

Computed from this source alone. Observed .

Movement

Change in probability, in percentage points (pp).

  • 1 hour±0.0 ppunchanged over 1 hourfrom 0.4% at
  • 24 hours±0.2 ppunchanged over 24 hoursfrom 0.3% at
  • 7 days±0.1 ppunchanged over 7 daysfrom 0.3% at
  • 30 daysNo baseline this far back

History — last 7 days

Probability over the last 7 days: 168 readings from 09-08 11:22 to 09-15 10:21 UTC. Starts at 0.3%, ends at 0.4%, ranging between 0.1% and 0.4%. 167 gaps where the source reported nothing, joined by a straight line rather than measured.0%25%50%75%100%09-0809-1009-1109-1309-15
Probability, 0–100 %. Times UTC. Where the source reported nothing, the two readings either side are joined by a straight line rather than measured.

Volatility

How much the probability has been moving, in probability units per √hour. Scaled by elapsed time, so a source polled often and one polled rarely produce comparable figures.

  • 1 hourNot enough readings1 increment
  • 24 hours0.000224 increments
  • 7 days0.0002168 increments
  • 30 days0.0002298 increments

Confidence and coverage

Confidence describes how well supported the number is and never how large it is.

High confidence0.80
1 sourceForecast markets1

Manipulation risk: low. Method version 1.0.0.

How this is calculated
Source
PolymarketForecast marketsPolymarket
Freshness
Up to dateUp to dateRead at 2026-09-15T10:21:58.372Z, calculated at 2026-09-15T10:25:59.526Z.
Participation behind it
$12,379 of depth
How easily it could be moved
Enough participation that moving this number would take a substantial position.
Method version
1.0.0Stored on this value; it identifies the code that produced it.

Probability 0.00

The source's own most recent published probability for this question, unchanged. Full method for probability

Change over time

How far the probability has moved over each window, in probability points. Full method for change over time

  • 1h±0.0 points unchanged, measured from 0.00 at 2026-09-15T09:22:01.032Z
  • 24h±0.2 points unchanged, measured from 0.00 at 2026-09-14T10:20:44.882Z
  • 7d±0.1 points unchanged, measured from 0.00 at 2026-09-08T10:22:03.548Z
  • 30dNo reading far enough back to measure from — not the same as no movement.

Variability

How much the probability has been moving about within each window. Full method for variability

  • 1hOnly 1 change in this window — too few to estimate from.
  • 24h0.000 probability units per √hour, from 24 changes
  • 7d0.000 probability units per √hour, from 168 changes
  • 30d0.000 probability units per √hour, from 298 changes

Confidence 0.80 — High

How well supported this source's number is — never how large, how recent, or how interesting the number is. Full method for confidence

  • Participation behind the contract0.87, carrying 40% of the score
  • Age of the newest reading0.98, carrying 30% of the score
  • Distance between the quoted sides0.96, carrying 20% of the score
  • Time until the question settles0.21, carrying 10% of the score

Coverage

Which sources stand behind a number, and which do not. Full method for coverage

  • This figure comes from Polymarket alone. Future Index does not combine forecasts from different sources into one number — why.
  • The source states no language or geographic scope for this question, so none is claimed here.

Read the full methodology

What was reported

Occurrences on the topics this contract is linked to. Each entry is one occurrence, however many outlets carried it.

  1. Nigeria: What's the real motivation behind Dangote's IPO 'for the people?'

    1 independent origin · low confidence

    Reports

    Deutsche Welle

  2. ChatGPT has a feature to help those in crisis.

    1 independent origin · low confidence

    Reports

    NPR

  3. US lawyer cites fake witnesses in murder case, blames ChatGPT

    1 independent origin · low confidence

    Reports

    Al Jazeera English

12 further occurrences on this page — show them

  1. Hong Kong court rules Dow Jones tried to stop journalist taking union role

    1 independent origin · low confidence

    Reports

    Al Jazeera English

  2. IPO report sets out findings from local authorities on counterfeit goods and wider IP crime threat.

    1 independent origin · medium confidence

    Reports

    Contains public sector information licensed under the Open Government Licence v3.0.

  3. Diesel price hits all-time high in US amid Iran war woes

    1 independent origin · low confidence

    Reports

    Al Jazeera English

  4. OpenAI unveils GPT‑6 Astra amid rising scrutiny and safety concerns

    1 independent origin · low confidence

    Reports

    Al Jazeera English

  5. OpenAI’s Sam Altman tells G20 AI will be as essential as electricity

    1 independent origin · low confidence

    Reports

    Al Jazeera English

  6. OpenAI faces new lawsuits over Tumbler Ridge mass shooting tragedy

    1 independent origin · low confidence

    Reports

    Al Jazeera English

  7. New lawsuits claim OpenAI execs put image ahead of safety in Canadian mass shooting

    1 independent origin · low confidence

    Reports

    NPR

  8. Can cut-price Shein shine in its long-awaited stock market debut?

    1 independent origin · low confidence

    Reports

    BBC News

  9. OpenAI says it detected malign activity months before Hugging Face attack

    1 independent origin · low confidence

    Reports

    Al Jazeera English

  10. Shein aims for almost $27bn valuation in 1 September stock market debut

    1 independent origin · low confidence

    Reports

    BBC News

  11. Chinese robotics giant Unitree soars in stock market debut

    1 independent origin · low confidence

    Reports

    BBC News

  12. Norway: World's top wealth fund flags stock market risks

    1 independent origin · low confidence

    Reports

    Deutsche Welle

Resolution

Settlement rules: Not available.

Source

  • SourcePolymarket
  • KindForecast markets
  • Contract id0x3f9f68feccc892303834833665bf204632438b028254fc2d5bceea757ff61ed3

Polymarket

This source's terms require a link back to the contract. Future Index does not yet store one, so the identifier above is shown instead.

Topics

  • openai
  • stock-markets

Last observed . Page built .