Yeschat

Chat with GPT-5.6 Luna Online

GPT-5.6 Luna is the fast, everyday tier of OpenAI's GPT-5.6. On YesChat, it is the model included on the free plan: just sign up and start asking.

What is GPT-5.6 Luna?

GPT-5.6 is OpenAI's three-tier model family released in July 2026: Sol, Terra and Luna. OpenAI describes Luna as the fastest and most affordable tier, made for frequent requests where quick answers matter more than the deepest reasoning. On YesChat, Luna is the model you get on the free plan, and it is available on every paid plan too.

What GPT-5.6 Luna is good for

Quick everyday questions

Ask how something works, what a word means or how to phrase an email, and get a short, clear answer.

Summaries and extraction

OpenAI lists information extraction, classification and content processing among Luna's typical uses: paste a text and ask for the key points, a table or a category for each line.

Drafts you will edit

Get a first version of a post, a reply or a plan, then ask for changes in the same conversation.

GPT-5.6 Luna vs other GPT models on YesChat

Luna, Terra and Sol are the three tiers of GPT-5.6; Astra belongs to GPT-6. Pick by how hard the task is and which plan you have. You can switch between them in the same YesChat chat. See how the GPT-5 family compares on our GPT-5 overview.

GPT-5.6 Luna: fast everyday chat

OpenAI describes Luna as the fastest and most affordable GPT-5.6 tier, built for frequent, lighter requests. On YesChat, it is the free plan's model (15 messages a day) and is billed at 1× on paid plans.

GPT-5.6 Terra: balanced everyday work

OpenAI positions Terra between Luna and Sol: strong performance for everyday coding, analysis and document work at a lower cost than the flagship. On YesChat it is available from the Pro plan at 1×, with no message cap on Ultra and Max (a fair-use limit applies). More about GPT-5.6 Terra.

GPT-5.6 Sol: the GPT-5.6 flagship

OpenAI positions Sol as the GPT-5.6 tier for the most demanding work: complex reasoning, advanced coding, long research and scientific analysis. On YesChat it is available from the Ultra plan and is billed at 2×. More about GPT-5.6 Sol.

GPT-6 Astra: long, multi-step tasks

OpenAI describes Astra as a GPT-6 model for complex, multi-step workflows that combines reasoning with coding, research and professional work. On YesChat it is available on the Max plan and is billed at 2×. More about GPT-6 Astra.

How to chat with GPT-5.6 Luna on YesChat

  • Step 1: Create a free account

    Sign up with your email. No credit card is needed. The free plan includes 15 messages a day with GPT-5.6 Luna.

  • Step 2: Click "Chat with GPT-5.6 Luna in YesChat"

    Click "Chat with GPT-5.6 Luna in YesChat": the YesChat chat opens with GPT-5.6 Luna already selected. The free plan includes 15 messages a day.

  • Step 3: Ask, attach a file, follow up

    Type your question and keep the conversation going. In the YesChat chat, agent mode (on every plan) also reads PDFs, Excel and CSV files, Word documents and screenshots.

Frequently Asked Questions