# OpenAI Upgrades GPT-5.6 Sol in ChatGPT, Brings GPT-5.6 Luna to Free Users

OpenAI announced improvements to its GPT-5.6 Sol model within ChatGPT, enhancing its capabilities for existing users. Additionally, the company is expanding access to GPT-5.6 Luna, making it available to free users. This broadens the reach of advanced AI tools to a wider audience.

**Importance:** 3/5

## Sources

### Science
- [OpenAI Blog](https://openai.com/index/improving-gpt-5-6-sol-in-chatgpt) — Thu, 06 Aug 2026 10:00:00 GMT

### Technology
- [Hacker News](https://openai.com/index/improving-gpt-5-6-sol-in-chatgpt/) — Thu, 06 Aug 2026 17:02:04 +0000