OpenAI adds GPT-6 Sol and Luna models to ChatGPT and Codex
OpenAI announced two new GPT‑6 variants, Sol and Luna, expanding the GPT‑6 family that already includes Astra. Both models run on fewer tokens than the GPT‑5.6 versions they replace and are priced about 50% lower, with API costs cut in half. OpenAI says Sol is suited for complex coding and agentic workflows, while Luna targets high‑volume, focused tasks.
Key points
- OpenAI released GPT‑6 Sol and Luna, priced 50% lower than GPT‑5.6 versions.
- Models launch today in ChatGPT Work and Codex for Plus, Pro, Business, Enterprise, Edu; Luna also free for Go users.
- Sol matches Claude Opus 5 performance at 80% lower cost; Luna beats GPT‑5.6 Sol at one‑tenth cost.
The models are rolling out today in the ChatGPT desktop app and Codex. They are available to Plus, Pro, Business, Enterprise, and Edu users, and Luna can also be used by Free and Go users in the desktop app. Enterprise admins must enable the models in their workspaces. OpenAI cites internal benchmarks: Sol matches Claude Opus 5 on the OSWorld 2.0 offline test at roughly 80% lower cost per task, and Luna outperforms GPT‑5.6 Sol while costing only one‑tenth as much. Daily token usage among OpenAI researchers is reported to exceed $600 for the median user and $7,000 for the 90th percentile, highlighting the importance of cheaper, high‑performance models for sustained coding work.
Model pages: GPT-6 Sol → · GPT-6 Astra →
The story so far
2 episodes →- OpenAI adds GPT-6 Sol and Luna models to ChatGPT and Codexthis story
OpenAI upgrading ChatGPT and Codex with two more GPT-6 models
9to5mac.com · 22 September 2026
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This text was published by 9to5mac.com and written by Zac Hall. It is reproduced here with attribution so you can read it in full; the rights remain with the publisher. Read it at the source ↗
Coverage and discussion
5sources- Hacker News discussion · 197 pointsnews.ycombinator.com
- OpenAI launches GPT-6 Sol and Luna, saying Sol makes about half as many mistakes as GPT-5.6 Sol and Luna matches GPT-5.6 Sol's performance at ~1% of the costPress · zdnet.com ·
- Bring more intelligence to everyday work with GPT-6 Sol and GPT-6 Luna on Amazon BedrockPrimary source · AWS Machine Learning Blog ·
- OpenAI launches GPT-6 Sol and Luna, boasting lower cost and fewer mistakesPress · TechCrunch AI ·
- GPT-6 Sol and LunaPrimary source · openai.com ·
The headline, key points and digest above were generated by Digest AI's editorial model from the linked sources. Automated summaries can contain errors: the sources are the record. Spotted a mistake? Tell us. Published by Martin K., who runs Digest AI and handles corrections.
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