OpenAI: gpt-6.1-terra

GPT-6.1 Terra is a mid-tier model in OpenAI's three-tier GPT-6.1 series, positioned between the flagship GPT-6.1 Sol and the fast, low-cost GPT-6.1 Luna. It combines detailed visual reasoning with accurate computer operation and writes clearer, more natural prose. Announced and made available on October 26, 2026, through ChatGPT Work, Codex, and the API, it is designed as a fast and efficient option for everyday professional work. The model supports text and image input with text output. It handles scoped code fixes, supports computer-use tasks with clearly defined outcomes, and is suited to agentic codebase investigation and iterative solution development. Everyday applications include drafting proposals, interpreting technical drawings, filling in forms, video editing, matching product photos with catalogs, and understanding complex documents. At 16.1 seconds per task, it is reported as the fastest OpenAI model and the third fastest overall. Its error rate on error-inducing prompts at low reasoning effort is 16.7%, down from 53.6% for GPT-5.6 Terra. At max effort, the error rate is 4.3%. In the lineup, it sits below the flagship GPT-6.1 Sol and the top-tier GPT-6 Astra.