GPT-5.6 released by 2026?

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Active sub-markets

Market context

The real-world event is OpenAI’s imminent public launch of GPT-5.6, a flagship model described by chief scientist Jakub Pachocki as a meaningful improvement over GPT-5.5, with backend identifiers already visible in Codex rollout logs despite no official system card or API string yet released[1][2].

Historical precedent frames the current 0% crowd-implied probability as a misreading of OpenAI’s rapid cadence: GPT-5.4 arrived March 5, GPT-5.5 April 23, and GPT-5.6 is tracking a consistent six-week interval, with Polymarket traders assigning 83–89% odds to a June 22–28 launch window based on over $1M in contract volume[1][2]. Past releases like GPT-5.5 became API-available the day after ChatGPT launch, suggesting a staged rollout pattern that will likely repeat for GPT-5.6, starting with ChatGPT and Codex before broader API access[1].

Traders should monitor the API model list for the first appearance of a GPT-5.6 identifier, watch for an official system card (expected to land simultaneously with the model as with GPT-5.5), and track Codex backend logs where version bumps first surface[1][5]. Recent reporting from The Information confirms the model is in late-stage preparation, with a refreshed training cutoff extending through the GPT-5.5 window[1]. Regulatory accessibility hinges on German GlüStV provisions and US CFTC reach: under current rules, “no-KYC up to $1,500” allows retail traders to access this market without identity verification, provided the platform complies with local tax and KYC thresholds, making it broadly accessible despite the technical complexity of the underlying event.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews GPT-5.6 released by 2026? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Polymarket Tax UK — the application we operate, where you trade directly against 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?

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

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Tax UK triggers a quick verification flow that finishes in 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.