GPT-5.6 released on 2026?

Platform comparison

Market context

OpenAI has officially previewed GPT-5.6 Sol, Terra, and Luna on 26 June 2026, yet the model remains unavailable to the general public, confined to a limited API and Codex preview for roughly twenty trusted partners. With the settlement window closing on 31 July 2026 and the current crowd-implied probability sitting at 0% for a "Yes" resolution, the market is effectively betting against broad consumer access occurring before the deadline. This 0% figure reflects a consensus that the "coming weeks" promise from OpenAI’s announcement will stretch beyond the settlement date, treating the current limited preview as a non-event for public availability.

Historically, frontier model launches follow a predictable cadence where a limited preview precedes general availability by two to six weeks, a pattern seen in recent GPT-5 iterations where "weeks" in frontier contexts rarely means days. The current probability of 0% suggests traders are pricing in the worst-case scenario where the rollout to ChatGPT and public API stalls past mid-July, despite Sam Altman’s internal hope for a release "a couple of weeks later" than the preview. Value may sit contrarian to this consensus if the "coming weeks" window compresses to the earliest reasonable estimate of 10–17 July, a timeline supported by Axios reporting on Altman’s internal targets, creating a potential underdog play against the 0% odds.

Traders should monitor the official OpenAI Help Center for any shift from "no announced general-availability date" to a specific calendar date, as well as the Cerebras integration launch scheduled for July, which often signals the final push for broad access. Recent reporting from The Information confirms that Jakub Pachocki described the model as a "meaningful improvement," indicating late-stage preparation, yet the absence of a public system card or API string remains the primary dependency for a "Yes" resolution. The key catalyst is the transition from the current partner-only preview to the promised broad access across ChatGPT, Codex, and the API, a move that must occur before 31 July to settle the market positively.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews GPT-5.6 released on 2026? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Who Will Win, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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 Who Will Win. 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.

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 Who Will Win trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.