When will GPT-5.6 be released?

Platform comparison

Active sub-markets

Market context

GPT-5.6 is expected to be released to the general public by late June 2026, with OpenAI’s chief scientist confirming it represents a meaningful improvement over GPT-5.5[1][5]. On Polymarket, the June 22–28 window currently trades at 83–89% probability, reflecting the strongest pre-launch consensus outside official channels[1]. This high implied probability contrasts sharply with the 0% crowd-implied YES probability on the Kalshi contract you referenced, suggesting divergent market interpretations or data latency.

Historically, OpenAI has compressed its flagship model cadence to roughly six weeks, down from multi-month cycles earlier in the GPT-5 series[1]. GPT-5.4 arrived on March 5, GPT-5.5 on April 23, and GPT-5.6 is now tracking a late June release, consistent with this accelerated rhythm[1]. The technical work behind GPT-5.6—including a redesigned reward audit pipeline post-goblin incident—has further compressed the release cycle, making delays less likely than in prior iterations[3].

Traders should monitor OpenAI’s Codex backend routing logs, where a canary release candidate has already surfaced, and watch for an official announcement expected around June 25[1][2]. Key catalysts include the expansion of the context window to 1.5M tokens (a 43% increase over GPT-5.5) and improved agentic workflow reliability[1]. Additionally, identity verification requirements for users and a knowledge cut-off moved to December 2025 may signal the final release window[2]. With Polymarket pricing the June 30 deadline at 89–93%, the on-chain conditional tokens (USDC on Polygon) indicate a high likelihood of settlement before the Kalshi window closes on 2026-06-28[1][8].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Kalshi UK, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

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 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.

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.