Stella AI Adds GPT-6.1 Sol, One Week After GPT-6 Sol
SUPERNOVA Inc. will offer OpenAI's GPT-6.1 Sol through its Stella AI and Stella AI for Biz services starting Monday, October 5, 2026. The model arrived one week after GPT-6 Sol and improves coding, document understanding, and specialized work. On Artificial Analysis's overall intelligence index, dated September 29, 2026, it comes within 1 point of OpenAI's top-tier GPT-6 Astra. OpenAI puts factual errors on highly difficult questions at 7.7%, down from 11.4%.