GPT-5.6 released by 2026?

Platform comparison

Active sub-markets

Market context

OpenAI has not yet publicly announced GPT-5.6, yet Polymarket prices the contract for a late-June release at 83–89% probability, with over $960,000 in conditional token volume on the Polygon network. This market, settling on 31 July 2026, currently shows 0% crowd-implied probability for a “Yes” outcome, creating a stark divergence between on-chain sentiment and public consensus. The discrepancy reflects how retail traders often lag behind institutional or insider signals embedded in backend routing logs.

Historical release patterns frame this divergence: GPT-5.4 launched on 5 March 2026, GPT-5.5 on 23 April, and GPT-5.6 is tracking a consistent six-week cadence. A single routing entry for GPT-5.6 appeared in OpenAI’s Codex backend logs in May, vanishing shortly after, mirroring the pre-launch signal for GPT-5.5. Past models like GPT-5.5 became API-available the day after their ChatGPT debut, suggesting a staged rollout rather than a single public announcement.

Traders should monitor the API model list, Codex update logs, and any forthcoming system card, as these are the first surfaces where GPT-5.6 will surface publicly. The Information reported on 10 June that chief scientist Jakub Pachocki described the model as a “meaningful improvement” over GPT-5.5, indicating late-stage preparation. No official release date has been confirmed, but the backend identifier and community pricing signal active development. Watch for a system card and API model string update, which will likely precede general availability.

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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 Kalshi UK — the application we operate, where you trade directly against 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?

On Kalshi 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.

Is this market available outside the US?

Kalshi UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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?

Not under $1,500 of lifetime trading volume. Above that threshold, Kalshi 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.