Yeschat

Chat with GPT-5.6 Sol Online

GPT-5.6 Sol is the flagship tier of OpenAI's GPT-5.6, for the hardest questions. On YesChat it is available from the Ultra plan.

What is GPT-5.6 Sol?

GPT-5.6 is OpenAI's three-tier model family released in July 2026: Sol, Terra and Luna. OpenAI positions Sol as the flagship tier for complex work that needs advanced reasoning, coding and careful refinement of results. In OpenAI's release, Sol leads the GPT-5.6 family on reasoning, coding and scientific benchmarks. On YesChat, Sol is available from the Ultra plan.

What GPT-5.6 Sol is good for

Hard reasoning problems

Use Sol when a question has many conditions, needs several steps of logic, or requires a careful check of the result.

Advanced coding and debugging

OpenAI positions Sol for software engineering work: tracing a bug across files, reviewing a design or refactoring code you will test.

Long research and technical analysis

OpenAI lists long-horizon research and scientific analysis among Sol's strengths: work through sources, compare findings and get a structured conclusion.

GPT-5.6 Sol 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. More about GPT-5.6 Luna.

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×.

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 Sol 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 Sol in YesChat"

    Click "Chat with GPT-5.6 Sol in YesChat": the YesChat chat opens with GPT-5.6 Sol already selected. GPT-5.6 Sol needs the Ultra plan or higher; a free account can use GPT-5.6 Luna.

  • 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