GPT-6.1 Sol is still the newest Sol in OpenAI's own material as the November 15 deadline nears
OpenAI's DevDay recap, dated September 29, introduced GPT-6.1 Sol. That is earlier history and cannot count toward this question, which needs a Sol at version 6.2 or higher to reach the public between October 21 and November 15. The forecast leans towards that not happening.