GPT-5.6 released on 2026?

Platform comparison

Market context

OpenAI has already announced GPT-5.6 on 26 June 2026, but the model remains locked in a limited preview for roughly 20 government-approved organisations; it is not yet available in ChatGPT or to individual users, and no general-availability date has been confirmed[1][2]. This explains the current 0% crowd-implied probability for the market: the event requires public release, not just announcement or restricted API access[2][6].

Historically, flagship models like GPT-5.4 (5 March) and GPT-5.5 (23 April) followed a six-week cadence, with GPT-5.6 tracking the same rhythm and a pre-release candidate already visible in Codex backend logs before the official launch[3]. Polymarket volume exceeded $1M ahead of the June 22–28 window, pricing that period at 83–89% probability—the strongest pre-launch consensus signal outside official channels[3]. The current 0% reflects the gap between announcement and actual public access, not uncertainty about the model’s existence.

Traders should monitor OpenAI’s official updates for a general-availability date, as the company states broad access in ChatGPT, Codex and the open API is planned “in the coming weeks”[2][4]. Key catalysts include any announcement of expanded partner eligibility, removal of the government-imposed gate, or integration into ChatGPT’s default model list[2][7]. Recent reporting from The Information confirms GPT-5.6 is a meaningful improvement over GPT-5.5, with agentic workflows and 10–15% token-efficiency gains, reinforcing the likelihood of a near-term rollout once access restrictions lift[3].

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 Kalshi UK, which mirrors the Polymarket order book at 0% fees.

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

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 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'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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.