OpenAI has announced the release of two updated GPT-6 models, Sol and Luna, following the recent debut of its flagship GPT-6 Astra. These new versions aim to bring the advanced intelligence of Astra to smaller, more affordable models that cater to different needs. Sol is tailored for complex tasks such as coding, while Luna handles high-volume clerical work like document summarization and quick question answering, making AI more accessible across various workflows.

A major highlight of these launches is the significant cost reduction for API access, with pricing for the GPT-6 Sol and Luna models set at half the price of their 5.6 series predecessors. OpenAI credits this price cut to technical improvements in caching and inference processes, which enhance efficiency. Alongside affordability, these models deliver improved accuracy, particularly in factual responses and coding error reduction, with internal testing showing Sol making around half as many mistakes as before.

OpenAI positions these models as superior not only to their earlier versions but also as outperforming key products from competitors like Anthropic. The company underscores that GPT-6 Sol and Luna offer better task performance compared to Anthropic’s recent models, such as Fable and Opus. Notably, Anthropic released its Opus 5.5 update just 90 minutes prior to OpenAI’s launch, highlighting the ongoing rivalry and rapid advancements in AI technology.

The updated Sol and Luna models are available immediately for businesses through ChatGPT Work, Codex, and the ChatGPT API for paid accounts. Luna has also been integrated into the ChatGPT desktop application and is accessible to Free and Go users. OpenAI plans a gradual rollout of these models across its consumer ChatGPT interfaces, enabling a broad user base to benefit from the enhanced capabilities and reduced costs of the GPT-6 generation.