Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Bot UK) Pick polygram.ink (preferred broker) |
94% | 6% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Place a position → |
Polymarket (direct) polymarket.com |
94% | 6% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Place a position → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Place a position → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Place a position → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Place a position → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| October 31 | 94% |
| September 30 | 89% |
| September 15 | 60% |
| August 31 | 24% |
| August 15 | 4% |
Market context
OpenAI has disclosed Astra as an internal “next major model”, but as of now there is still no public model card, no API, no pricing page and no announced release date. The market therefore hinges less on capability than on whether OpenAI ships any public-facing build, and whether it keeps the Astra name or confirms that a renamed successor is the same system described on 1 August.[2][11][12]
For framing, recent OpenAI launches have often been announced with limited advance notice and then branded in ways that left traders parsing whether a rumoured name would actually ship. A useful comparison is the GPT-5.5 / “Spud” episode, where expectations for one label did not cleanly map to the public release name, which is why the contract’s wording around “confirmed to be the same model” matters for programme-level resolution logic.[6][8][14] In practical terms, a bot watching this market would treat the current 4% as a low-confidence placeholder unless the naming or access decision is explicitly surfaced in an OpenAI post or product update.
The main catalysts are official announcements, any posted roll-out schedule, and whether OpenAI completes the reported pre-release review process that has been described as taking roughly 30 days.[1][2][13] Traders monitoring this programmatically should watch for changes on OpenAI’s site, developer documentation, and major product pages, plus any reports that the model has entered public testing or been folded into ChatGPT or the API. If no launch appears by the end of the review window implied by reporting, the probability of a “Yes” outcome falls sharply, because the contract only pays if Astra is made available to the general public by the settlement deadline.[1][2]
Methodology
This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Bot UK, which mirrors the Polymarket order book directly.
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 Polymarket Bot UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.
- 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.
- 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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