OpenAI ships GPT-6.1 Terra to its API
GPT 6.1 Terra
OpenAI has added GPT-6.1 Terra to its API documentation, giving developers a new model to call through the Responses API and related endpoints. The docs cover streaming, reasoning effort, response_format, tools, and the broader model catalog, so builders can compare Terra against other GPT-6 options and wire it into agents, code generation, and structured output workflows.
For the complete documentation index, see llms.txt.