Introducing GPT-6.1 Terra
OpenAI introduces GPT-6.1 Terra, a fast, efficient model for visual reasoning, computer use and writing, priced at half of GPT-5.6 Terra and GPT-6.1 Sol.
Introducing GPT-6.1 Terra
OpenAI, October 26, 2026. Summary in our own words; original: https://openai.com/index/introducing-gpt-6-1-terra/
What it is
GPT-6.1 Terra is a fast, efficient GPT-6 series model built for everyday professional work: visual reasoning, precise computer use and clearer writing. OpenAI pitches it as a large step up from GPT-5.6 Terra for tasks such as drafting proposals, reading technical drawings, filling out forms and editing video.
Price
Standard API prices are half those of GPT-5.6 Terra and GPT-6.1 Sol. In ChatGPT Work and Codex the same plan allowance covers more tasks than with GPT-5.6 Terra, and substantially more than with GPT-6.1 Sol or GPT-6 Astra.
Price per million tokens
Input
$1
Cached input
$0.05
Output
$5
Computer use and vision (OpenAI-reported)
Agents' Last Exam (professional computer-use tasks): at medium effort, 15 points above GPT-5.6 Terra at about a third of the cost, and on par with GPT-6 Astra at a tenth of Astra's per-token price. At max effort, over three times as token-efficient as Claude Opus 5.5 and a quarter of its per-token price, for roughly 9x lower cost per task. Over three times faster than GPT-6 Astra and GPT-6.1 Sol.
MMMU-Pro (visual reasoning): beats GPT-5.6 Terra at every reasoning setting and nearly matches GPT-6 Astra and GPT-6.1 Sol.
OSWorld 2.1 (desktop apps): at medium effort, beats GPT-5.6 Terra's best score at a fraction of the cost per task.
Factuality and coding (OpenAI-reported)
Internal error-inducing prompts: error rate fell from 53.6% (GPT-5.6 Terra) to 16.7% at low effort, and by 18 points to 4.3% at max effort.
Terminal-Bench 4.0: 50.3% at max effort, versus 21.5% published for GPT-5.6 Terra.
Terminal-Bench-Science 0.1: beats GPT-6.1 Sol at max effort and comes within five points of Claude Opus 5.5 at under a fifth of the estimated cost.
For the hardest coding tasks OpenAI still recommends GPT-6.1 Sol and GPT-6 Astra.
Safety
OpenAI rates GPT-6.1 Terra Critical in cybersecurity under its Preparedness Framework and keeps the protections built for GPT-6 Astra. It reports better scope-keeping and honesty about limitations than GPT-5.6 Terra and strong prompt-injection resistance.
Availability
Available from launch day to Plus, Pro, Enterprise and Edu users in ChatGPT Work and Codex, and in the API as gpt-6.1-terra.