GPT-5.6 released on 2026?

Platform comparison

Market context

The underlying event is OpenAI’s decision to delay a full public launch of GPT‑5.6 at the US government’s request, restricting initial access to a small group of vetted partners while promising broader availability in the coming weeks[3][7]. This limited preview, announced on 26 June 2026, means the model is not yet available in ChatGPT or to individual consumers, and no general‑availability date has been confirmed[1][6].

Historically, model release dates have been mispriced by prediction markets; for instance, Polymarket previously priced an 89% chance of a 30 June public release for GPT‑5.6, yet markets have been wrong about launch timelines many times this year[2]. Comparable cases show that technical work—such as auditing reward signals and retraining the reward model post‑incident—can compress or extend cycles unpredictably, making a 0% current crowd‑implied probability for a release before July 2026 a cautious but defensible read[2].

Traders should monitor Codex backend logs for version‑bump entries, the timing of the system card release (which typically lands simultaneously with the model), and any official announcements about expanding API or ChatGPT access[2][4]. Recent leaks suggest GPT‑5.6 may arrive next week with lower token prices to compete with Anthropic, though these remain unconfirmed and should be weighed against OpenAI’s stated plan to expand availability “soon”[8][7]. Programmatic approaches would include scraping Codex logs for routing entries and setting conditional orders tied to system‑card publication dates.

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 Polymarket Review UK, which mirrors 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

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'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.

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.