GPT-5.6 Terra
The middle GPT-5.6, at half the input price of GPT-5.6 Sol.
A model a workspace can run · gbrain.io
OpenAI
GPT-5.6 Terra
The middle GPT-5.6, at half the input price of GPT-5.6 Sol.
- Vendor
- OpenAI
- Released
- Jun 2026
- Model id
- gpt-5.6-terra
GPT-5.6 Terra is the middle of OpenAI’s three GPT-5.6 models, between Sol and Luna. It costs half what GPT-5.6 Sol costs on input and three fifths on output, and it holds about a million tokens of context.
It reasons before it answers.
Best for: everyday work on OpenAI that does not need the largest model.
Pick it per workspace from the model settings and switch any time. Inference is included in the plan, or bring a key of the team's own.