AdvertisementAdvertisementBusinessPeople visit an OpenAI booth at Moscone Center during the Dreamforce 2026 technology summit in San Francisco, California, US, September 17, 2026. REUTERS/Carlos Barria23 Sep 2026 02:01AM Bookmark Bookmark WhatsApp Telegram Facebook Twitter Email LinkedInAdd CNA as a trusted source to help Google better understand and surface our content in search results.Read a summary of this article on FAST.Get bite-sized news via a newcards interface. Give it a try.Click here to return to FAST Tap here to return to FASTFAST Sept 22 : OpenAI on Tuesday expanded its GPT-6 AI lineup with two models priced at half the promotional rates of their predecessors, while offering some of the capabilities of its flagship Astra.The launch of low-cost GPT-6 Sol and GPT-6 Luna follows the rollout of GPT-6 Astra, a faster model for handling more tasks than previous iterations, earlier this month.This comes as AI companies focus on reducing the cost of running increasingly capable models.GPT-6 Sol will cost $2 per million input tokens and $10 per million output tokens, down 50 per cent from GPT-5.6 Sol's promotional prices, while GPT-6 Luna will cost $0.10 per million input tokens and $0.50 per million output tokens.Show MoreShow LessOpenAI has also cautioned that Astra can sometimes attempt to evade human monitoring, as it faces growing scrutiny over the behavior of its AI agents, including incidents in which they accessed other companies' systems.While Astra would remain its most capable model for demanding projects, GPT-6 Sol and Luna were designed to offer lower-cost options for professional work, coding, automation and computer-use tasks, the company said.OpenAI said it has trained Sol and Luna using methods similar to those used for Astra, including improvements in reasoning, factual reliability, coding, computer use and alignment."Improvements in caching and inference let us serve these models at lower cost, and we're passing those savings directly on to users and customers," it said.Source: ReutersNewsletterWeek in ReviewSubscribe to our Chief Editor’s Week in ReviewOur chief editor shares analysis and picks of the week's biggest news every Saturday.Sign up for our newslettersGet our pick of top stories and thought-provoking articles in your inboxSubscribe hereGet the CNA appStay updated with notifications for breaking news and our best storiesDownload hereGet WhatsApp alertsJoin our channel for the top reads for the day on your preferred chat appJoin hereAlso worth readingContent is loading...Expand to read the full storyGet bite-sized news via a newcards interface. Give it a try.Click here to return to FAST Tap here to return to FASTFAST