Updates·September 24, 2026, 08:06
OpenAI cuts prices with new models Sol and Luna
AI-generated and checked against the sources listed below.
OpenAI has launched two new AI models, GPT-6 Sol and GPT-6 Luna, which cost up to half as much as the previous versions and, according to the company, make fewer mistakes.
OpenAI has expanded its GPT-6 family with two new models: Sol and Luna. They follow the company's most powerful model, GPT-6 Astra, which was launched earlier in September.
The two new models are not flagship models but cheaper and faster versions that companies and developers can use through OpenAI's API, the technical access that other programs use to get answers from the models.
Sol is intended for more demanding tasks such as programming, debugging and data analysis. Luna is designed for simpler and more routine tasks, for example summarizing documents, retrieving specific information or giving short answers to questions.
Prices are roughly halved compared with the earlier 5.6 versions of Sol and Luna. According to OpenAI, this is due to technical improvements in the way the models process and reuse data.
OpenAI also says that Sol makes about half as many mistakes as its predecessor, thereby coming close to the reliability of the more expensive Astra model, but at a far lower price. The company also claims that the new models perform better than competing models from Anthropic on several tasks, but this has not yet been confirmed by independent tests.
The models are already available to paying users in ChatGPT Work, in the coding tool Codex and via the API. Luna is gradually rolling out to more users, including free users of ChatGPT.
For ordinary users, the launch mainly means that companies building services on top of OpenAI's technology can do so more cheaply, which over time may be reflected in the price of the AI tools you use in everyday life.
What this means for you
If you use ChatGPT Work or Codex, you can already choose Sol or Luna for your tasks: Sol for programming and analysis, Luna for quick lookups and summaries. If you are a developer or a company, you can switch to the new models in the API and save on the bill without compromising on quality. Ordinary users don't need to do anything right now, but may over time see cheaper or better AI tools because they build on this technology.
Sources
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