Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Prediction Today) Pick polygram.ink (preferred broker) |
94% | 6% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
94% | 6% | 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 | 94% |
| September 30 | 89% |
| September 15 | 67% |
| August 31 | 25% |
| August 15 | 4% |
Market context
OpenAI has only just put a name on Astra, but it still has not given a public launch date, pricing, or API details, and the market is being repriced around how quickly a research preview can turn into a release. Reporting around the announcement suggests Astra may be among the first systems to go through a new federal pre-release review, which is described as taking about 30 days; on that basis, September has been framed as the earliest plausible public window, not a confirmed target.[1][2]
The closest historical read-through is OpenAI’s tendency to preview frontier systems well before they are broadly available, then decide later how to package them. That matters here because the naming decision is still open: coverage says OpenAI has not yet fixed whether Astra becomes GPT-6, GPT-5.7, or a separate family, which leaves room for a release under an unexpected label and keeps the settlement question live through the autumn.[2][14]
For traders, the key catalysts are any official OpenAI post, a confirmed start or completion of the federal review, or signs that the model has entered a staged rollout in ChatGPT or via the API. The latest market data also shows the crowd leaning to a late-October outcome rather than an August or mid-September one, with Polymarket’s listed probabilities heavily skewed towards 31 October and 30 September, implying that a fast release still needs an explicit go-ahead from OpenAI rather than just more preview coverage.[5][11]
Methodology
We track OpenAI’s Astra released by…? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.
Resolution & payout
Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.
Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.
UK Frequently Asked Questions
- 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.
- What's the difference between YES and NO shares?
- A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.
- 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%.
Trade OpenAI’s Astra released by…? on Prediction Today
Live order book, 0% fees, USDC settlement in seconds.
Open live market →