GPT-5.6 released on 2026?

Platform comparison

Market context

The real-world event is whether OpenAI will make its GPT-5.6 model generally available to the public before the settlement window closes in July 2026. As of today, the crowd-implied probability for a “Yes” resolution sits at 0%, reflecting a consensus that the release will not happen within the timeframe. This mirrors historical patterns where limited previews, such as the June 26, 2026 announcement of GPT-5.6 Sol, Terra, and Luna, precede general availability by weeks rather than days[1][4]. In past cycles, like the progression from GPT-5.1 to GPT-5.2, the gap between preview and public rollout averaged six to eight weeks, suggesting that even if the model is technically ready, broad access may fall outside the settlement window[2].

Traders should monitor Codex backend logs for version-bump signals and await the official system card, which typically lands alongside public release[2]. OpenAI has stated it plans to make GPT-5.6 generally available “in the coming weeks,” but has not announced a specific date[3][6]. A recent leak spotted a routing entry for GPT-5.6 in Codex logs, with Polymarket pricing an 89% chance of release by June 30, though markets have frequently misjudged model launch dates this year[2]. The value spot may lie in contrarian angles: if the preview-to-public window compresses due to technical fixes post-goblin incident, a late-June release could still occur, but the 0% market price suggests the consensus expects a delay beyond July 8[2][5].

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 2026, 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 Who Will Win 2026. 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.

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.

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.