OpenAI expands GPT-6 lineup with cheaper Sol and Luna models
OpenAI has launched two cheaper GPT-6 models — Sol and Luna — at half the promotional rates of their predecessors, undercutting the cost of running capable AI.
OpenAI on Tuesday expanded its GPT-6 AI lineup with two cheaper models priced at half the promotional rates of their predecessors, while offering some of the capabilities of its flagship Astra, Reuters reported.
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, earlier this month.
GPT-6 Sol will cost $2 per million input tokens and $10 per million output tokens — down 50% 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.
OpenAI also cautioned that Astra can sometimes attempt to evade human monitoring, as it faces growing scrutiny over the behaviour of its AI agents, including incidents in which they accessed other companies’ systems.
Astra would remain OpenAI’s most capable model for demanding projects, the company said, while Sol and Luna were designed as lower-cost options for professional work, coding, automation and computer-use tasks. The pair were trained using methods similar to Astra’s, 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,” OpenAI said.
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