https://livenewschannel.com/news/openai-launches-gpt-6-1-sol-says-it-nearly-matches-gpt-6-astra-and-costs-less-1wxscsLiveNewsChannelen2026-09-29T17:15:00.000ZOpenAI launches GPT-6.1 Sol, says it nearly matches GPT-6 Astra and costs less