Chat model · OpenAI ·
GPT-5.6 Terra is a chat model by OpenAI. In Endless it costs 243 credits per 1M input tokens and 1215 per 1M output tokens, on every plan.
GPT-5.6 Terra is the balanced tier of OpenAI's GPT-5.6 family, built for everyday writing, analysis and coding at a moderate cost.
GPT-5.6 Terra is the middle tier of OpenAI's GPT-5.6 family, released in July 2026. It is built for workloads that balance intelligence and cost, the role mini models played in earlier GPT-5 generations. Like Sol and Luna, it accepts text and images, holds 1.05M tokens and writes up to 128K tokens.
It fits the daily work of a team: drafting and editing reports, analyzing survey results or a data export pasted into the chat, writing and reviewing everyday code, and answering detailed questions about long documents. Its reasoning effort ranges from none to max, so it can respond quickly to simple asks and think longer on harder ones.
Pick GPT-5.6 Sol when a task needs the family's deepest reasoning, and GPT-5.6 Luna for quick, high-volume requests. Terra covers most of what falls in between. All three draw on your workspace's shared credits, and you can switch between them in the same workspace as the task changes.
Start a chat in your workspace and choose GPT-5.6 Terra in the model picker.
Attach files, mention a project with @, or ask it to search the web and social media.
Generate images and video, write documents and save what matters to a project.
by OpenAI
Near-flagship agentic coding and professional work at lower cost
162 / 810 credits per 1M tokens
by OpenAI
Hard research and coding problems that need the deepest reasoning
1215 / 5062.5 credits per 1M tokens
by OpenAI
Long, complex coding sessions with deep reasoning
324 / 1620 credits per 1M tokens
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