OpenAI introduces updated GPT-6 Sol and Luna models with improved efficiency and lower costs

Sep 22, 2026

AI Summary

OpenAI has launched new versions of its GPT-6 models, Sol and Luna, which promise enhanced efficiency and reduced costs. The models are designed for different tasks, with Sol focusing on complex coding and Luna on clerical work, and they are reported to have a lower error rate compared to their predecessors.

OpenAI has expanded its GPT-6 generation with the launch of updated Sol and Luna models, following the introduction of GPT-6 Astra earlier this month.
Sol is tailored for complex tasks like coding, while Luna is suited for clerical tasks such as summarizing documents and answering quick questions.
The new models are available at half the cost of the previous 5.6 series, attributed to improvements in caching and inference.
OpenAI claims that GPT-6 Sol has a significantly lower error rate, making about half as many mistakes as its predecessor, achieving Astra-level reliability.
The company asserts that its models outperform those of its main competitor, Anthropic, which recently released a new version of its Opus model.
The updated Sol and Luna models are accessible in ChatGPT Work, Codex, and the ChatGPT API, with Luna also available in the desktop app and for Free and Go users. OpenAI plans a gradual rollout to the ChatGPT app and website.

openaigpt-6language modelsai researchcost reduction

OpenAI introduces updated GPT-6 Sol and Luna models with improved efficiency and lower costs

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