Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via BTC Prediction) Pick polygram.ink (preferred broker) |
90% | 10% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Open live market → |
Polymarket (direct) polymarket.com |
90% | 10% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Open live market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Open live market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Open live market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Open live market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| December 31, 2026 | 90% |
| September 30, 2026 | 62% |
| August 31, 2026 | 21% |
| August 21, 2026 | 14% |
| August 14, 2026 | 4% |
| July 31, 2026 | 0% |
| December 31, 2025 | 0% |
| March 31, 2026 | 0% |
| August 7, 2026 | 0% |
| June 30, 2026 | 0% |
Market context
OpenAI has not publicly confirmed a GPT-6 release, and the market only resolves yes if a model explicitly named GPT-6 is made generally available before year-end, not if it remains in private testing or arrives under a different label. That distinction matters because OpenAI has already shown it can ship a frontier model without using the expected number: the model widely discussed as “Spud” was released on 23 April 2026 as GPT-5.5, not GPT-6, which pushed trader expectations further out.[1][12][14]
The closest comparable case is the move from GPT-4 to GPT-5, where naming and product packaging lagged the underlying capability ramp, so headlines about “next model” progress have to be read carefully. For this contract, the relevant analogue is not whether OpenAI is advancing internally, but whether it chooses a public, named launch that clears the market’s bar; the current 0% implied probability suggests traders see that as very unlikely within the settlement window, especially after prior 2025 launch chatter was explicitly ruled out by OpenAI and no public GPT-6 timetable has been published.[2][6][15]
Catalysts to watch are straightforward: an OpenAI announcement naming GPT-6, a ChatGPT release note, or an API/model-catalog update that shows general availability rather than closed access. A trader also has to watch whether OpenAI again rebrands the next model family, because a differently named release would not settle this market yes even if capabilities advance materially.[9][11][12] In crypto terms, the contract still settles in USDC, so pricing will mainly react to headline-driven repricing rather than on-chain fundamentals, though any broader risk-on move in BTC or ETH can lift speculative flow across prediction markets when large traders rotate into event contracts.
Methodology
Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.
Resolution & payout
Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.
Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.
FAQ
- Why USDC and not ETH or USDT?
- USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.
- How does UMA secure the resolution?
- The UMA Optimistic Oracle uses a bond system: a proposer posts a bond, a two-hour challenge window opens. On dispute the losing side forfeits the bond — financial incentive for honest resolution.
- How volatile are crypto prediction markets?
- Crypto markets react to spot prices — a 5% BTC move typically shifts a "BTC above X by date" market 10-20%. Polymarket crypto market liquidity is usually six-figure USD, sufficient for active trading.
- Which crypto markets exist on Polymarket?
- Currently active markets include BTC/ETH/SOL price targets, halving dates, ETF approvals, hard-fork outcomes and Layer-2 TVL thresholds. The list updates weekly; biggest volume sits on BTC and ETH price forecasts.
- Are crypto prediction markets taxable in the US?
- In the US, prediction market gains are typically treated as ordinary income or short-term capital gains depending on holding period. Consult a tax professional for your specific situation — we cannot provide tax advice.
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