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GPT-5.6 Is Now Available on Dante AI: Sol, Terra, and Luna

By Dante AIJuly 14, 20265 min read

TL;DR: GPT-5.6 is now available on Dante AI in three tiers: Sol (most capable), Terra (the balanced default), and Luna (fastest). You choose the model per AI agent in its settings, and changing models does not require retraining. The three tiers cost 25, 10, and 5 credits per message. GPT-5.6 is available on the Starter plan and up.

GPT-5.6 is now available on Dante AI. It arrives in three tiers, Sol, Terra, and Luna, so you can match each AI agent to the right balance of capability, speed, and cost. Pick a model in your agent's settings, keep the knowledge it was already trained on, and start free.

OpenAI released GPT-5.6 in July 2026, and it works differently from a single new model. The number is the generation, and the name is a durable capability tier that moves at its own pace. That gives you three clear choices rather than one, and Dante AI now lets you assign any of them to any agent.

Meet the three GPT-5.6 tiers

Each tier is built for a different job, so the best pick depends on what your agent does.

GPT-5.6 Sol is the flagship. Reach for Sol when an agent answers complex or high-stakes questions and you want the most capable model in the family.
GPT-5.6 Terra is the balanced default. OpenAI positions Terra as competitive with the previous GPT-5.5 flagship while costing less to run, which makes it the right starting point for most AI agents.
GPT-5.6 Luna is the fastest. Choose Luna when speed and volume matter most, such as a busy support agent handling a high number of everyday questions.

How to choose the right model

A simple way to decide: start on Terra, then move up or down only if you have a reason to. If an agent fields detailed, nuanced, or sensitive questions, try Sol and compare the answers. If an agent handles a large volume of quick, routine questions and you care about responsiveness and cost, Luna is likely the better fit. Because the model is set per agent, you are never locked into one choice across your whole account.

What each model costs in credits

Every reply your AI agent sends uses credits, and the amount depends on the model. The GPT-5.6 tiers are priced to reflect their capability:

GPT-5.6 Sol: 25 credits per message.
GPT-5.6 Terra: 10 credits per message.
GPT-5.6 Luna: 5 credits per message.

Terra is the standout on value. It delivers flagship-class quality at a standard credit cost, so most teams get the quality they want without spending at the top of the range. You can see your remaining credits and top up any time from your dashboard.

Try GPT-5.6 on your own content. Create a free account, train an AI agent on your website or documents, and see it answering in about 60 seconds. No card needed.

Start free

How to switch an agent to GPT-5.6

Changing models takes a few seconds, and it does not affect what your agent knows.

Open your agent. Log in to Dante AI and open the AI agent you want to update, or create a new one by training it on your website, documents, or files.
Find the model selector. Go to the agent's settings, where the available models are listed.
Pick a GPT-5.6 tier. Choose Sol, Terra, or Luna.
Save and test. Save the change and send a test message. The agent replies on GPT-5.6 right away, using the knowledge it was already trained on.

The model is separate from your training data, so you can switch back and forth or run different tiers on different agents without retraining anything.

Availability and plans

GPT-5.6 Sol, Terra, and Luna are available on the Starter plan and up. If you are new to Dante AI, you can start free to build and test an agent on your own content, then choose a paid plan when you are ready to run it on GPT-5.6. Plans start at $40 per month for Starter, $120 for Advanced, and $400 for Pro, all billed in US dollars.

Frequently asked questions

What is GPT-5.6?

GPT-5.6 is OpenAI's latest model family, released in July 2026. Instead of one model, it ships as three capability tiers that advance on their own cadence: Sol (the flagship), Terra (balanced), and Luna (fastest). All three are now selectable inside Dante AI.

Which GPT-5.6 model should I use?

Terra is the balanced default for most AI agents: OpenAI positions it as competitive with the previous GPT-5.5 flagship while costing less to run. Choose Sol when an agent handles complex or high-stakes questions and you want the most capable model. Choose Luna when speed and volume matter more than maximum depth, for example a high-traffic support agent.

How many credits does each GPT-5.6 model use?

Each reply costs 25 credits on Sol, 10 credits on Terra, and 5 credits on Luna. Terra delivers flagship-class quality at a standard credit cost, which is why it is the recommended default.

Do I have to retrain my AI agent to switch to GPT-5.6?

No. The model an agent uses is separate from the knowledge it was trained on. You can switch an existing agent to GPT-5.6 in its settings, and it keeps everything it already learned from your website, documents, and files.

Which plans include GPT-5.6?

GPT-5.6 Sol, Terra, and Luna are available on the Starter plan and up. You can start free to build and test an AI agent, then choose a paid plan to run it on GPT-5.6.

Can I use different models for different AI agents?

Yes. The model is set per agent, so you can run a fast Luna agent on your support site and a Sol agent for a detailed product or research assistant, all from the same account.