Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Prediction Today) Pick polygram.ink (preferred broker) |
20% | 80% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
20% | 80% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| December 31, 2026 | 20% |
| September 30, 2026 | 2% |
| August 31, 2026 | 0% |
| July 31, 2026 | 0% |
| December 31, 2025 | 0% |
| June 30, 2026 | 0% |
Market context
OpenAI’s public listing looks less imminent than it did in early June: after confidentially filing IPO paperwork, reports on 25–26 June said the company was leaning towards waiting until next year rather than pressing ahead in 2026. Reuters said the firm had filed confidentially with US regulators, but had not fixed a timetable, while the New York Times reported internal discussion of a delay; CNBC then noted traders had marked down the odds of a near-term debut after that reporting.[9][13][1][2]
The market should be read against a difficult comparable: a confidential filing is only the first step, and it does not guarantee a public listing by the deadline. OpenAI has repeatedly kept timing open, with Reuters saying a 2027 listing is the internal goal of some executives, while other reports still leave room for a late-2026 debut if conditions improve.[4][6][11] The current 1% price is consistent with that spread, because a full IPO would require not just a filing, but pricing, launch preparation and a completed stock-market debut before 31 December 2026.[3][10]
The main catalysts are any explicit timing update from OpenAI, the appearance of a public S-1, and evidence that the bank-led deal process has moved into pricing or roadshow stages. CNBC reported that the company had not yet held pre-IPO meetings or set an official schedule in late June, which means the next credible shift would likely come from fresh company disclosure or detailed reporting on underwriters and launch windows.[11][6] If OpenAI continues to signal a preference for 2027, the probability of a 2026 completion should stay compressed.[1][13]
Methodology
This page reviews OpenAI IPO by 2026? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Prediction Today, which mirrors the Polymarket order book at 0% fees.
Resolution & payout
At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.
On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.
UK Frequently Asked Questions
- Where can I trade this market with the lowest fees?
- Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Prediction Today. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.
- How does resolution work?
- Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.
- Is Polymarket legal in the UK?
- Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.
- Do I pay tax on prediction market profits in the UK?
- UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.
- How do I deposit on Polymarket from the UK?
- UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.
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