Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Kalshi UK) Pick polygram.ink (preferred broker) |
93% | 7% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
93% | 7% | 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 | 93% |
| September 30 | 87% |
| September 15 | 50% |
| August 31 | 23% |
| August 15 | 3% |
Market context
Polymarket’s contract is marked at **4% YES** today, so the market is pricing Astra as an unlikely public release by 31 October 2026, with settlement paid in USDC on Polygon through the usual conditional token structure. That level also implies traders think the gap between OpenAI’s 1 August disclosure and a general-public launch is still wide, despite the model already being named and publicly acknowledged.[4][10]
The comparison set is awkward for anyone trying to read the odds from prior OpenAI launches. OpenAI has a record of naming internal systems well before broad availability, and several reports on Astra say there is still no model card, API endpoint, pricing, or confirmed ship date.[2][3][10][11] Coverage around the August reveal also says OpenAI has not decided whether Astra will appear as GPT-6, a GPT-5 variant, or under a separate branding line, which matters because a rebrand or slower rollout could push the public release beyond the settlement window even if development is advanced.[12][13][15]
For catalysts, traders should watch for any OpenAI blog post, product demo, API announcement, or a change in branding that explicitly ties a public model to the August disclosure. Several reports say Astra may be subject to a roughly 30-day federal pre-release review, which would make late September an early plausible window if that process is actually underway, but that timing remains inference rather than an official commitment.[1][6] Recent reporting also says OpenAI has not published benchmarks or a launch timeline, so the next move in this market is likely to come from a concrete release notice rather than from the original research post alone.[2][3]
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
Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.
Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.
UK Frequently Asked Questions
- Is this market available outside the US?
- Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.
- 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%.
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