GPT-5.6 released by 2026?

Platform comparison

Active sub-markets

Market context

The real-world event is OpenAI’s imminent public release of GPT-5.6, a flagship model confirmed by chief scientist Jakub Pachocki as a meaningful improvement over GPT-5.5, with a late-June 2026 launch now visible in Codex backend logs despite no official system card or API string [1][2]. This market’s 0% crowd-implied probability is starkly misaligned with the 83–89% consensus on Polymarket, where over $1M in contract volume has priced a June 22–28 release window [1][2]. Historically, similar pre-launch signals—such as the Codex log leak of GPT-5.5 three weeks before its April 23 release—have reliably preceded public availability, framing the current odds as an outlier rather than a rational assessment [2][4].

Traders should monitor three catalysts: the Codex update surface where version bumps first appear, any official OpenAI announcement or system card, and the June 30 deadline for Polymarket’s over-under contract [2][4]. Recent reporting from The Information confirms the model is in late-stage preparation, with Pachocki describing it as a “meaningful improvement” while noting the release aligns with a broader ChatGPT overhaul [1][2]. The technical shift includes a redesigned reward audit pipeline post-goblin incident, compressing the release cycle but not altering the core capability profile of coding, agentic tool use, and multimodal processing [4]. Programmatically, conditional orders should trigger on Codex log entries or API model string updates, as these are the earliest public indicators of release [2][4]. No action is required before an official announcement, as GPT-5.5 remains the current production model serving ChatGPT and Codex traffic [1].

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 PolyGram — 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 PolyGram, 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?

PolyGram 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.

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, PolyGram 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.