# OpenAI adds GPT-6 Sol and Luna models to ChatGPT and Codex

Digest AI · Generative AI & Models · published 2026-09-16T13:00:00Z · updated 2026-09-22T18:15:08Z

Canonical: https://digestai.news/story/openai-launches-gpt-6-sol-and-luna-with-50-lower-api-prices

## Summary

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.

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.

## 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.

## Why it matters

Cheaper, high‑capacity GPT‑6 variants lower the cost barrier for developers and enterprises, enabling more ambitious coding agents and large‑scale AI applications.

## Sources

1. [OpenAI upgrading ChatGPT and Codex with two more GPT-6 models](https://9to5mac.com/2026/09/22/openai-upgrading-chatgpt-and-codex-with-two-more-gpt-6-models) (9to5mac.com, 2026-09-22)
2. [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 cost](https://zdnet.com/innovation/openai-gpt-6-sol-luna-release) (zdnet.com, 2026-09-22)
3. [Bring more intelligence to everyday work with GPT-6 Sol and GPT-6 Luna on Amazon Bedrock](https://aws.amazon.com/blogs/machine-learning/bring-more-intelligence-to-everyday-work-with-gpt-6-sol-and-gpt-6-luna-on-amazon-bedrock) (AWS Machine Learning Blog, 2026-09-22, primary source)
4. [OpenAI launches GPT-6 Sol and Luna, boasting lower cost and fewer mistakes](https://techcrunch.com/2026/09/22/openai-launches-gpt-6-sol-and-luna) (TechCrunch AI, 2026-09-22)
5. [GPT-6 Sol and Luna](https://openai.com/index/introducing-gpt-6-sol-and-luna) (openai.com, 2026-09-16, primary source)

Part of the developing story: [AI Model Showdown on the Cloud](https://digestai.news/thread/comparing-openai-models-on-aws-for-workload-efficiency) (2 stories)

## Cite

Digest AI, "OpenAI adds GPT-6 Sol and Luna models to ChatGPT and Codex", 16 September 2026, https://digestai.news/story/openai-launches-gpt-6-sol-and-luna-with-50-lower-api-prices

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