GPT-5.6 Luna and Terra are now available

Two OpenAI models are now available for Biel.ai chatbots.

GPT-5.6 Luna is the new default on every plan. GPT-5.6 Terra is available on Business plans and above for questions that benefit from more reasoning.

To switch, open Settings > Chatbot > Model and choose GPT-5.6 Luna or GPT-5.6 Terra.

The models documentation lists every option and its plan requirements.

What this means for docs teams

Test Luna and Terra against your own documentation and representative questions before choosing a production default. Compare answer quality, refusal behavior, and response time for your workload.