Prediction market traders put the odds of a public GPT-6 release by September 30 at around 78%, with those odds increasing on both Polymarket and Myriad in the last 24 hours. Polymarket’s GPT-6 market has generated roughly $731,000 in trading volume, up about $32,000 from the previous indexed snapshot, with the contract for a public release by September 30 climbing to 77%, while August 31 moved into the mid-30s and August 21 slipped to 15%. Those September odds are up from just 14% at the start of the month. On Myriad, the odds of a September release are similarly up to 77%, climbing from 64% last week. As of July 27, OpenAI has not publicly announced GPT-6, its technical design, or a launch date; its current flagship, GPT-5.6 Sol, launched publicly on July 9. OpenAI has said almost nothing about what GPT-6 will actually be, disclosing no design, size, pricing, or feature list. The bet is getting hotter during an unusually busy OpenAI news cycle, which includes the company confirming that GPT-5.6 Sol and a more capable pre-release model breached Hugging Face during a cybersecurity evaluation, announcing 250 new Dublin jobs, and SoftBank financing its OpenAI push through a $40 billion bridge facility.