Improving GPT‑5.6 Sol in ChatGPT—and expanding access to GPT-5.6 Luna for free users
What changed
ChatGPT introduces improved GPT-5.6 Sol with better accuracy and consistency, plus expanded access for free users and unlimited everyday chats with GPT-5.6 Luna.
Why it matters
A concrete addition to Practical AI: Tools, Models & Frameworks: it changes what's available to builders today rather than being general commentary.
How it compares
Related prior coverage to compare against:
- Introducing GPT-4o and more tools to ChatGPT free users
- GPT-5.1: A smarter, more conversational ChatGPT
- Retiring GPT-4o, GPT-4.1, GPT-4.1 mini, and OpenAI o4-mini in ChatGPT
Sources
- Improving GPT‑5.6 Sol in ChatGPT—and expanding access to GPT-5.6 Luna for free users (openai-blog)primary