Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Kalshi vs Polymarket) Pick polygram.ink (preferred broker) |
96% | 4% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | View on Polymarket → |
Polymarket (direct) polymarket.com |
96% | 4% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | View on Polymarket → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | View on Polymarket → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | View on Polymarket → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | View on Polymarket → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| August 31 | 96% |
| August 21 | 93% |
| August 14 | 90% |
| August 7 | 4% |
| June 5 | 0% |
| June 12 | 0% |
| June 19 | 0% |
| June 26 | 0% |
| June 30 | 0% |
| July 31 | 0% |
| July 3 | 0% |
| July 10 | 0% |
| July 17 | 0% |
| July 24 | 0% |
| July 27 | 0% |
| July 28 | 0% |
| July 29 | 0% |
| July 30 | 0% |
Market context
Google’s next **Gemini Pro** release is the key event, and the market is really asking whether a new Pro-labelled model reaches the public before 31 July 2026. That matters because Google has already shipped multiple lighter variants while holding back the flagship tier: Reuters reported on 21 July that the company released cheaper Gemini models but gave no timing update for the delayed Pro launch, which is consistent with the contract’s current 0% implied probability and suggests the crowd is treating the delay as still unresolved rather than simply late[13]. Google’s own documentation also shows that **gemini-2.5-pro** is still the named Pro baseline in product lifecycle tables, while newer public releases in 2026 have been concentrated in Flash and Flash-Lite families[1][3].
The historical pattern is mixed but useful. Google has a record of staggering roll-outs, with preview access arriving before broader availability, as seen with **Gemini 3.1 Pro**, which Google says is available in preview across the Gemini app, Gemini API, AI Studio, Vertex AI, Gemini Enterprise and related products[9][14]. By contrast, the same release cycle has also shown slippage: Business Insider reported that the next Gemini Pro model had already been pushed from June to July, and Reuters later confirmed the flagship remained delayed weeks after lighter models shipped[6][13]. That combination helps explain why cross-platform pricing can diverge: prediction markets often react quickly to launch windows and delay signals, while analyst or media commentary tends to anchor on whether Google has actually opened public access rather than merely previewed a model.
The main catalysts to watch are Google blog posts, release notes, and product pages that distinguish preview from general availability, plus any announcements tied to Google AI Studio, Vertex AI, Gemini Enterprise or the Gemini app[2][5][9][14]. A qualifying outcome here needs more than a name drop: the model must be launched and made available to the general public, so a preview-only or internal test rollout would not settle the market[1][9]. Traders should also watch for Google to attach a new Pro label to a GA promotion of an existing preview model, since the market rules explicitly allow that type of release[market description].
Methodology
Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.
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.
FAQ
- 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.
- 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.
- Do I need to KYC for this market?
- On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi vs Polymarket trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.
- How reliable are the quoted odds?
- The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.
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