OpenAI's New GPT-6 Sol and Luna Models Bring Astra Improvements to Cheaper Tiers
OpenAI has launched GPT-6 Sol and GPT-6 Luna, two new models designed to bring advanced capabilities from the GPT-6 Astra tier to more affordable price points. These models offer improved performance in coding, factuality, and computer use while adopting a clearer communication style with fewer misleading claims. The new models are available across various ChatGPT and Codex plans, with significantly reduced token prices compared to their predecessors.
- ▪GPT-6 Sol is positioned for everyday work with stronger reasoning, while GPT-6 Luna is optimized for fast responses and high-volume tasks at a lower cost.
- ▪OpenAI reduced the price of GPT-6 Sol to $2 per million input tokens and GPT-6 Luna to $0.10 per million input tokens, representing significant discounts from previous versions.
- ▪The new models feature improved prompt caching that allows agents to reuse context and receive 90 percent discounts on cached input-token reads.
- ▪GPT-6 Sol and Luna are rolling out in ChatGPT Work and Codex for paid users, while Luna is available to Free and Go users in the desktop app.
- ▪Anthropic released a new Opus 5.5 model on the same day, which reportedly outperforms GPT-6 Astra on certain coding and knowledge work benchmarks.
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| Canonical URL | https://www.macrumors.com/2026/09/22/openai-gpt-6-sol-luna/ |
| Publication time | Tue, 22 Sep 2026 20:58:32 +0000 |
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OpenAI's New GPT-6 Sol and Luna Models Bring Astra Improvements to Cheaper TiersTuesday September 22, 2026 1:58 pm PDT by Juli CloverOpenAI today launched GPT–6 Sol and GPT–6 Luna, two new models that follow GPT–6 Astra. OpenAI says the new models were developed using methods similar to Astra's for improvements in professional work, factuality, coding, computer use, and alignment. GPT–6 Sol is for everyday work, and it costs less than Astra. GPT–6 Luna is an even cheaper model. Luna is optimized for fast responses and higher volume, while Sol has more reasoning capability. The new models outperform their predecessors on OpenAI's benchmark tests, and GPT–6 Sol makes "about half as many mistakes" as GPT–5.6 Sol.
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