OpenAI's shift to the GPT-6 generation, with Astra launching in early September and Sol/Luna variants following later that month, has slowed updates to the prior GPT-5.6 Terra tier, leaving the next 5.7+ release without confirmed announcements or credible leaks as of late October 2026. Traders assign the highest implied probability to late-October dates due to historical tiered cadence after major launches, yet spread odds across November because regulatory safety reviews and competitive pressure from rivals like Anthropic continue to influence timelines. The 14% chance of no release by November 30 reflects uncertainty over whether OpenAI will prioritize higher-tier GPT-6.1 refinements or resume balanced Terra updates amid ongoing benchmark competition and platform dynamics.