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Chat model · OpenAI

OpenAI GPT 5.6 Terra

Included in Pro · came out July 2026

Practical, down-to-earth help with plans, money and paperwork

GPT 5.6 Terra is one of the fuller models in OpenAI's GPT 5.6 line. It suits practical jobs that need a bit of thought: a household budget, a letter to sort out a problem, a plan for the week.

Chat with OpenAI GPT 5.6 Terra

OpenAI GPT 5.6 Terra 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 Terra 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.

Thank you so much for taking care of my plants while I was away. It was such a relief knowing they were in such kind hands, and they look wonderfully happy! Please enjoy this little gift as a small token of my appreciation.

Answered in about 3 seconds · 43 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 Sol
  5. July 2026OpenAI GPT 5.6 TerraYou're here
  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 Terra selected and the message already written. Change any word you like.

Look at my monthly budget

“Here are my monthly costs. Group them, tell me where most of the money goes, and suggest three realistic ways to save 100 a month without big changes. Here they are:”

Try this

Ask for a refund

“Write a polite but firm email to an online shop. I returned a coat five weeks ago, they confirmed they received it, and I still haven't had my refund. Ask for it within 7 days and mention the order number:”

Try this

Explain my rental contract

“I'll upload my rental contract. Tell me in plain words how long it lasts, how much notice I need to give, who pays for repairs, and anything unusual I should know.”

Try this

Plan a busy week

“Help me plan next week. I work 9 to 3 on weekdays, take my mother to the doctor on Tuesday afternoon, have a dentist appointment on Thursday, and want to cook at home at least 4 nights. Make a simple day-by-day plan.”

Try this

In plain words

GPT 5.6 Terra is a chat assistant from OpenAI. It’s one of the three models in the GPT 5.6 line, and one of the two fuller ones, next to Sol. Luna is the lighter member.

It thinks before it answers, reads photos and documents, and can search the web. It’s a good pick for everyday jobs that take a bit of care, like money, letters and plans.

How to get the most out of it

  1. Paste the real numbers. A budget or a bill works best with the actual figures.
  2. Say what you want to happen. “I want my refund within a week” gives the letter a clear goal.
  3. Upload the contract or form rather than describing it.
  4. Ask for a short checklist at the end, so you know what to do next.

How it compares with its siblings

GPT 5.6 Sol is its closest sibling, at the same level. GPT 5.6 Luna is the lighter one for quick questions. Earlier OpenAI versions include GPT 5.5 and GPT 5.4, and GPT 6 Astra is newer.

When to pick another model

For money questions, our household budget guide has messages ready to send. For long, sensitive letters, many people like Claude Opus 5.

Other models worth a look

OpenAI GPT 5.6 Sol

OpenAI

Read the guide

OpenAI GPT 5.6 Luna

OpenAI

Read the guide

OpenAI GPT 5.5

OpenAI

Read the guide

Frequently asked questions

What's the difference between Terra and Sol?

Both are fuller models in OpenAI's GPT 5.6 line and sit at the same level in chatmodel. The easiest way to choose is to send the same message to both and keep the answer you prefer.

Terra or Luna?

Luna is the lighter, quicker one. Terra is fuller and better suited to jobs that need more thought.

Can it search the web?

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

Can it read my documents?

Yes. It reads PDFs and understands photos.

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