GPT-5.6 released on 2026?

Platform comparison

Market context

OpenAI has already announced the GPT-5.6 family on 26 June 2026, yet a full public rollout to general consumers remains deferred at the US government’s request, limiting initial access to a small group of vetted partners [3]. While preview announcements and system cards have surfaced, the market’s current crowd-implied probability of 0% for a release before the settlement window reflects the uncertainty surrounding when broader availability through ChatGPT, Codex, and the API will actually occur [1][6].

Historical precedents show that model release timelines often compress or extend based on technical dependencies, such as the redesigned reward audit pipeline implemented post-goblin incident, which can delay public launches despite internal readiness [2]. Comparable cases like GPT-5.5’s rollout, which followed a similar pattern of limited preview before general access, suggest that traders should expect incremental rather than step-change improvements, with public availability likely following the preview phase by several weeks rather than days [2].

Key catalysts to monitor include the publication of a new system card, which typically coincides with the model’s public debut, and updates to Codex backend logs where version bumps first appear [2]. Recent reports indicate OpenAI is considering holding off its public debut until next year, adding weight to the 0% probability for an immediate release [3]. Traders should also watch for announcements regarding expanded API and ChatGPT access, as these signals often precede the final public rollout [1][7].

Sources: 1 · 2 · 3 · 4 · 5

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 Best Prediction Markets UK, which mirrors the Polymarket order book directly.

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.

FAQ

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 Best Prediction Markets UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets UK 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.