Source - "Free & Go users get unlimited text chats with GPT-5.6 Luna starting tomorrow."
Expanding access for free users
We’re expanding access to our latest models for free users with unlimited text chats using GPT‑5.6 Luna, plus a new Think button for harder questions.For questions that require deeper reasoning, Free users can tap the new Think button to give GPT‑5.6 Luna more time to work through the answer.
(found on ozbargain)
Luna is more like Claude Code Haiku tier. Small/quick. Not super intelligent or deep thinking. Good for light tasks but NOT grinding a large code base or complex reasoning.
Weakest to strongest —
ChatGPT: Luna, Terra, Sol, Sol Pro
Claude: Haiku, Sonnet, Opus, Fable
Gemini: Flash-Lite, Flash, Pro, Deep Think
Thanks fella. What was openai offering before for free if Luna is their weakest model?
GPT 5.5 Instant, which was an older model.
Needs a bit more context on this one please?
The OpenAI Free plan affords you minimal privacy by default, but it provides granular manual controls that allow you to lock down your data. If you use the Free plan without changing any settings, OpenAI collects your conversations, uses them to train future AI models, and uses your activity data to personalise in-app advertisements.
So is luna like sonnet is for claude or something?