What changed in GoHighLevel on September 23, 2026?
On September 23, 2026, HighLevel made OpenAI's GPT-6 Sol and GPT-6 Luna models available in the AI Agent action and the GPT action inside GoHighLevel workflows. According to HighLevel's changelog, they replace the GPT-5.6 models, with more accurate outputs and pricing 50 percent lower.
Both models appear in the Model dropdown of the two workflow actions. Nothing changes in existing workflows until you pick the new model, so this is an opt-in upgrade. The primary source is HighLevel's changelog entry, GPT-6 Sol and GPT-6 Luna Now Available in AI Agent and GPT Actions, and OpenAI's own announcement of the models.
What is the difference between GPT-6 Sol and GPT-6 Luna?
GPT-6 Sol is the model for complex work: multi-step agent tasks, workflows that span several apps, and decisions that need careful reasoning. GPT-6 Luna is the fast, low-cost model for high-volume tasks such as classifying messages, writing summaries, tagging contacts and drafting quick replies.
Which model for which workflow task
| Workflow task | Better fit | Why |
|---|---|---|
| Tag an inbound message by intent | Luna | Simple classification at high volume |
| Summarize a call or conversation into a note | Luna | Short, well-defined output |
| Draft a first reply to a new lead | Luna, or Sol for high-value leads | Depends on how much reasoning the reply needs |
| AI Agent action that looks up data and decides next steps | Sol | Multi-step reasoning |
| Qualifying a lead against several rules | Sol | Fewer reasoning mistakes matter more than cost |
What does this mean for your GoHighLevel automation?
For most GoHighLevel accounts, this means the AI steps in your workflows can cost less and make fewer mistakes, but only after you switch each action to the new model and test it, because a different model can phrase replies differently or classify edge cases another way.
Switching models safely
- List every workflow that uses the GPT or AI Agent action.
- Duplicate one workflow, switch the copy to GPT-6 Luna or Sol, and run test contacts through both.
- Compare outputs, especially tags and classifications that later branches depend on.
- Switch the live workflow once the outputs match or improve.
If you do not know which of your workflows use AI steps, that is a sign the account needs an audit. See fix a messy GoHighLevel account.
Should you switch every AI step right away?
No. Switch AI steps that run often or that make decisions first, where lower cost or better accuracy pays off most, and leave low-volume, working steps until you have tested the new models on them.
A workflow that classifies thousands of messages a month gains most from Luna's lower cost. A workflow where an AI Agent decides whether to book, escalate or disqualify a lead gains most from Sol's accuracy. For how AI steps fit into workflows generally, see GoHighLevel automation and AI workflow automation. More updates are on the news page, or ask us on a free call via the contact page.
Related: GoHighLevel CRM, AI sales agent, and a real AI-qualified lead flow in the Ultra Cryo case study.
