GPT-5.6 is here: Sol, Terra and Luna, and what they mean for your business

What is GPT-5.6?

GPT-5.6 is OpenAI's newest generation of the models behind ChatGPT, launched on June 26, 2026. It comes in three variants: Sol (the most powerful), Terra (a balanced everyday model) and Luna (fast and affordable).

The naming is new too. The number (5.6) tells you which generation you're dealing with. The name (Sol, Terra or Luna) tells you which tier you're on, measured in intelligence, speed and price. The idea is that you should pick a model based on the job you need done, not just grab "the newest one".

What is the difference between Sol, Terra and Luna?

Sol is the flagship for the heavy tasks. Terra gives roughly the same quality as its predecessor GPT-5.5 at around half the price, and is meant for everyday work. Luna is the fastest and cheapest, built for simpler tasks at high volume.

• Sol: the most powerful. For analysis, coding and research that require deep thinking.

• Terra: a balanced everyday model. About 2x cheaper than GPT-5.5 with similar performance.

• Luna: fast and the most affordable. For high volumes of simpler tasks.

What is new in GPT-5.6?

GPT-5.6 thinks deeper and works smarter than its predecessor. Two things stand out: a new "max" setting that gives Sol more time to reason through hard problems, and an "ultra" mode that lets the model hand subtasks to several sub-agents working at the same time.

OpenAI reports clear improvements in coding (a new top score on the Terminal-Bench 2.1 test), in biology and in cybersecurity. The model is also wrapped in what OpenAI calls its most thorough safety work to date, with over 700,000 GPU hours spent on automated testing to find weaknesses before launch. If you're building AI into your own systems, it's also worth noting the more predictable caching, which can cut the cost of repeated requests.

What does GPT-5.6 cost?

For developers using the model via the API, the price is given per million tokens: Sol costs 5 dollars in and 30 dollars out, Terra 2.50 and 15, and Luna 1 and 6. In ChatGPT, the models are included in the usual subscriptions as they roll out.

A token is roughly a syllable or a short chunk of a word, so "per million tokens" is the price for a good amount of text in and out. The practical point: Terra delivers close to GPT-5.5 quality at about half the price, so the same job gets cheaper than before.

Why can't you use it right away?

GPT-5.6 is currently in a limited preview. OpenAI is starting with a small selection of trusted partners via the API and the coding tool Codex, after dialogue with US authorities about the model's cyber capabilities, and plans a broader launch in ChatGPT "in the coming weeks".

OpenAI is clear that it doesn't want this kind of government sign-off to become a permanent arrangement. For you it simply means GPT-5.6 probably isn't in your ChatGPT yet. It's coming, but in waves.

What does GPT-5.6 mean for Norwegian businesses?

For most Norwegian businesses, the gain lies in the choice, not the raw power. With three tiers you can match the model to the task: use an affordable model for most things, and save the flagship for what is actually heavy.

Three things are worth taking away.

You don't need to wait for the "right model" to get started. The tools you already have are more than good enough for email drafts, summaries, customer replies and first drafts of content. Most Norwegian businesses don't extract a fraction of what they already pay for.

Lower prices make automation cheaper. When Terra gives similar quality to GPT-5.5 at about half the cost, it becomes cheaper to build AI into fixed workflows. For a business running many requests a month, that counts on the bottom line.

Choose your tier wisely. It's tempting to always grab the most powerful one, but then you pay flagship prices for jobs a cheaper model does just as well. Use Luna or Terra for volume, and bring out Sol when the task requires real thinking power.

We don't hype every new model at Wud. We translate them into what you should actually do on Monday. A more powerful model is worth little until it sits in a workflow that saves someone at the office real time.

Bottom line: GPT-5.6 splits the ChatGPT models into three tiers, and for you as a business owner it's less about power and more about choosing the right model for the right job. It lands in ChatGPT for most people in the coming weeks. Until then, the best thing you can do is put AI to systematic use on the tasks you already have.

Want to know where AI actually saves your business time? Book a meeting with us and let's talk.

Frequently asked questions about GPT-5.6

What is GPT-5.6?

GPT-5.6 is OpenAI's newest model generation for ChatGPT, launched on June 26, 2026. It comes in three tiers: Sol (the most powerful), Terra (balanced) and Luna (fast and affordable).

What is the difference between Sol, Terra and Luna?

Sol is the flagship for heavy tasks. Terra is the everyday model, with close to GPT-5.5 quality at about half the price. Luna is the fastest and cheapest, for simpler tasks at high volume.

When does GPT-5.6 arrive in ChatGPT?

OpenAI has started with a limited preview for selected partners via the API and Codex, and plans a broader launch in ChatGPT "in the coming weeks" from late June 2026.

What does GPT-5.6 cost?

Via the API the price is per million tokens: Sol 5 / 30 dollars (in/out), Terra 2.50 / 15 dollars and Luna 1 / 6 dollars. In ChatGPT the models are included in the usual subscriptions as they roll out.

Is GPT-5.6 available in Norway?

Not for most people yet. The model is rolling out gradually, and is initially available to a small selection of trusted partners. Broad access in ChatGPT is expected in the weeks after launch.

Which GPT-5.6 model should my business use?

Use Luna or Terra for volume and daily tasks, and Sol for what requires deep analysis, coding or research. That way you don't pay flagship prices for jobs a cheaper model solves just as well.