Skip to content
chatmodel
Try now
OpenAI logo

Chat model · OpenAI

OpenAI GPT 5.6 Sol

Included in Pro · came out July 2026

For questions that need explaining, comparing and writing up

GPT 5.6 Sol is one of the fuller models in OpenAI's GPT 5.6 line. It suits questions where you want things explained and compared, then written up clearly.

Chat with OpenAI GPT 5.6 Sol

OpenAI GPT 5.6 Sol in numbers

What it knows about

Up to February 2026

It learned from information up to February 2026. For anything newer it can search the web and show you where it found it.

What you can give it

  • Your wordsYes
  • PhotosYes
  • PDFs and filesYes
  • The webYes

Real answers

See how OpenAI GPT 5.6 Sol answers

We asked it the same everyday questions as every other model in chatmodel, one try each. This is exactly what came back.

My neighbour watered my plants for two weeks while I was away. Write a short, warm thank-you note I can leave with a small gift. Keep it under 80 words.

Dear [Name],

Thank you so much for taking such wonderful care of my plants while I was away. It was a huge comfort knowing they were in good hands, and I truly appreciate your kindness. Please enjoy this little gift as a token of my gratitude!

Warmly,
[Your Name]

Answered in about 2 seconds · 49 words

Ask it yourself

The GPT family in chatmodel

The newest is OpenAI GPT 6 Astra. Ordered by release date.

  1. March 2026OpenAI GPT 5.4
  2. March 2026OpenAI GPT 5.4 Mini
  3. April 2026OpenAI GPT 5.5
  4. July 2026OpenAI GPT 5.6 SolYou're here
  5. July 2026OpenAI GPT 5.6 Terra
  6. July 2026OpenAI GPT 5.6 Luna
  7. September 2026NewestOpenAI GPT 6 Astra

What it's good for

Try it with one of these

Press “Try this” and chatmodel opens with OpenAI GPT 5.6 Sol selected and the message already written. Change any word you like.

Explain heat pumps

“Explain what a heat pump is, how it's different from a gas boiler, and what questions I should ask an installer. I live in an older house with radiators. Keep it plain and under 300 words.”

Try this

Compare two insurance offers

“I have two home insurance offers. Put them side by side: what each covers, the excess, and anything that stands out. Then tell me which suits a small flat with no expensive valuables. Here they are:”

Try this

Tidy up notes from the doctor

“Turn these rough notes from my husband's hospital appointment into a clear summary for our children: what the doctor said, the next steps, and the questions we still have. Here are the notes:”

Try this

Learn about a place before a trip

“We're visiting Lisbon for the first time in spring. Give me a short introduction to the city: its neighborhoods, what it's known for, a few local dishes, and one thing most visitors miss.”

Try this

In plain words

GPT 5.6 Sol is a chat assistant from OpenAI. It belongs to the GPT 5.6 line, which has three models: Luna, the lighter one, and Terra and Sol, the two fuller ones.

It thinks before it answers, reads photos and documents, and can search the web. It works well for explaining a topic, comparing options and turning messy notes into something clear.

How to get the most out of it

  1. Say what you already know. “I know nothing about this” or “I’ve read a bit” changes how it explains.
  2. Ask for a side-by-side. “Put them in a table” makes comparisons easier to read.
  3. Paste your rough notes as they are. Typos and half sentences are fine.
  4. Ask follow-up questions. “What does that word mean?” in the same chat keeps the thread.

How it compares with its siblings

GPT 5.6 Terra is at the same level, and GPT 5.6 Luna is the lighter one. For a newer, more capable OpenAI model, see GPT 6 Astra. Earlier versions include GPT 5.5 and GPT 5.

When to pick another model

For writing that must sound warm and personal, compare with Claude Opus 5. For a trip, our plan a trip guide has ready messages.

Other models worth a look

OpenAI GPT 5.6 Terra

OpenAI

Read the guide

OpenAI GPT 5.6 Luna

OpenAI

Read the guide

OpenAI GPT 6 Astra

OpenAI

Read the guide

Frequently asked questions

What's the difference between Sol and Terra?

Both are fuller models in OpenAI's GPT 5.6 line and sit at the same level in chatmodel. Try the same message on both and keep the answer you prefer.

Is Sol better than Luna?

Sol is fuller and better suited to bigger questions. Luna is lighter and quicker for everyday ones.

Can it search the web?

Yes. It can look things up online when your question needs recent information.

Can I upload a PDF?

Yes. It reads documents and understands photos.

All of these models, in one place

Chat, images, video and tools with the best AI models. Switch between them whenever you want.

Start for free

Chatmodel is an independent service offering access to third-party AI models. AI can make mistakes. Using Chatmodel means you agree to our Terms and Privacy Policy.