GPT-5.6 released on 2026?

Platform comparison

Market context

The real-world event is that OpenAI announced a limited preview of GPT-5.6 on 26 June 2026, but deferred a full public rollout at the US government’s request, restricting initial access to vetted partners via the API and Codex[1][3]. General availability for ChatGPT, Codex and the API is planned in the coming weeks, yet no fixed date has been confirmed[4][6]. This explains the current crowd-implied probability of 0%: the market resolves on the date the model is made available to the general public, and the preview phase does not satisfy that condition.

Historically, model release timelines have been compressed by technical dependencies such as reward-audit pipeline redesigns following safety incidents, which delay public launches despite early backend sightings[2]. For instance, a single routing entry in Codex logs surfaced GPT-5.6 weeks before its official preview, yet Polymarket’s 89% pricing for a 30 June public release proved inaccurate as broader access remained pending[2]. Traders should watch for official system card publications, Codex version-bump updates, and statements on expanded API access, as these are the first reliable signals of public availability[2][7]. Recent reporting confirms the delay is government-driven, not technical, making policy announcements a critical catalyst[3].

Programmatically, this market is approached by monitoring OpenAI’s Deployment Safety Hub for system card updates and tracking Codex workspace logs for version changes that indicate public rollout[2][4]. Conditional orders should be triggered when OpenAI explicitly states “generally available” in official communications, as vague phrases like “soon” do not resolve the market[4][7]. The settlement window ends 31 July 2026, so any delay beyond that date results in a “No” outcome, regardless of later availability.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track GPT-5.6 released on 2026? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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 Kalshi Fees. 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.

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.