Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Sport Prediction) Pick polygram.ink (preferred broker) |
95% | 5% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
95% | 5% | 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 |
|---|---|
| October 31 | 95% |
| September 30 | 89% |
| September 15 | 66% |
| August 31 | 27% |
| August 15 | 4% |
Market context
OpenAI has publicly confirmed Astra as an internal “next major model”, but it has not announced a release date, public pricing, or a final commercial name. The key market question is therefore less about whether Astra exists and more about whether OpenAI can turn that research preview into a general release before 31 October, which the current 4% implied probability suggests traders see as unlikely.
Comparable cases argue for caution with early optimism. OpenAI has previously turned closely watched model previews into later, differently branded launches, and current reporting says Astra may still be processed under a roughly 30-day federal pre-release review before any public rollout.[1][2] That leaves room for a late-September or October debut, but also leaves open the possibility that the company keeps it in testing, renames it, or ships it as part of another product tier rather than as “Astra” itself.[2][6]
For traders, the main catalysts are official OpenAI posts, any named access page or API listing, and any follow-up reporting on the regulatory review timeline. Reporting this week says Astra is still not publicly available and that OpenAI has not confirmed timing, while market trackers show the front-runner expiry dates remain clustered around late September and 31 October, which fits the idea that release is possible but not imminent.[1][11][12] The sharpest upside move would likely come from a clear launch announcement; absent that, the market will keep pricing in schedule risk and naming uncertainty.[3][14]
Methodology
Sports-specific comparison page for OpenAI’s Astra released by…?. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi or Manifold.
Resolution & payout
Sports markets typically settle on official final-whistle plus league confirmation. Polymarket uses UMA Optimistic Oracle with a source URL per contract — usually official league data feeds or ESPN/Soccerway. Two-hour dispute window, then smart-contract payout in USDC.
UK Frequently Asked Questions
- Are prediction markets better than sports betting?
- Prediction markets tend toward tighter odds than bookmakers because they use peer-to-peer exchange rather than bookmaker margin. On major matches, Polymarket quotes typically sit 2-5% closer to the true probability model than bet365 or DraftKings.
- Can I bet on individual matches?
- Yes, Polymarket lists every major Premier League / Champions League / World Cup match as its own market. Liquidity varies — top matches like El Clásico or a semi-final often have six-figure pools, lower-league games closer to three-figure.
- 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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