OpenAI released GPT-6.1 Terra for ChatGPT Work, Codex and API users, highlighting computer-use performance, coding improvements and lower standard API prices.
OpenAI introduced GPT-6.1 Terra on October 26, 2026, positioning the model for visual reasoning and tasks performed through computer interfaces. The company says it can handle work such as interpreting technical drawings, completing forms and editing video, alongside writing and software tasks.
OpenAI reports that on Agents’ Last Exam, a benchmark of professional tasks, Terra scored 15 percentage points above GPT-5.6 Terra at medium reasoning effort while costing about one-third as much. At that setting, OpenAI says its performance was on par with GPT-6 Astra at one-tenth the price per token. The company also reports that Terra finished tasks more than three times faster than GPT-6 Astra and GPT-6.1 Sol at maximum effort.
OpenAI’s internal tests found that the model’s error rate on prompts designed to induce mistakes fell from 53.6% for GPT-5.6 Terra to 16.7% at low reasoning effort. At maximum effort, the reported rate was 4.3%. On Terminal-Bench 4.0, which evaluates command-line software engineering tasks, Terra solved 50.3% of tasks at maximum effort, compared with GPT-5.6 Terra’s previously published 21.5% score. OpenAI says its higher-end GPT-6.1 Sol and GPT-6 Astra remain better suited to the most complex coding work.
GPT-6.1 Terra is available to Plus, Pro, Enterprise and Edu users in ChatGPT Work and Codex, and through the API under the model name gpt-6.1-terra. Standard API rates are $1 per million input tokens, $0.05 per million cached input tokens and $5 per million output tokens. OpenAI says those standard prices are 50% below GPT-5.6 Terra and GPT-6.1 Sol. The company also says Terra meets its Preparedness Framework’s Critical threshold for cybersecurity and retains safeguards developed for GPT-6 Astra.