**[Polymarket: "GPT-5.6 will not be publicly available before June 28" probability rises to 78%, up 67% in 24 hours]** Odaily Seer Prophet Channel monitoring shows that the Polymarket prediction "GPT-5.6 will not be publicly available before June 28" has seen its probability rise to 78%, with a 24-hour increase of 67%. OpenAI Chief Scientist Jakub Pachocki described GPT-5.6 in an internal memo on June 11 as a significant upgrade compared to GPT-5.5. Analysts believe that prior leaks in May related to the Codex backend, along with the rapid iteration pace following the release of GPT-5.5 on April 23, have strengthened market expectations for the imminent launch of GPT-5.6. According to the rules, GPT-5.6 includes models explicitly named GPT-5.6 as well as those recognized by OpenAI as direct successors to GPT-5.5 (e.g., GPT-5.7, GPT-5.8, etc.). Task-specific models, cost-optimized versions such as Nano/Mini, and inference models from the "o series" are excluded from the scope of this event. Similarly, next-generation flagship models like GPT-6 do not qualify. Eligible models must be officially made available for public use, including open beta versions or open waitlist formats. Versions limited to closed testing or private access do not meet settlement criteria. This event will primarily rely on OpenAI's official announcements and website information for settlement, supplemented by verification from credible media reports. Odaily Seer Prophet Channel continues to monitor prediction markets, observing changes before pricing occurs.