OpenAI launches GPT-6.1 Terra, 50% cheaper than previous models
GPT-6.1 Terra is available in ChatGPT Work, Codex and the API at $1 per million input tokens and $5 per million output tokens.
OpenAI released GPT-6.1 Terra on October 26, 2026, a model aimed at computer use, visual reasoning, coding and everyday work. The model is available to Plus, Pro, Enterprise and Edu users in ChatGPT Work and Codex, and via the API as gpt-6.1-terra.
API pricing for GPT-6.1 Terra is $1 per million input tokens and $5 per million output tokens, 50% lower than GPT-5.6 Terra and GPT-6.1 Sol.
On the Agents' Last Exam benchmark, GPT-6.1 Terra scored 15 percentage points higher than GPT-5.6 Terra at medium reasoning effort. OpenAI says the model completes tasks more than three times faster than GPT-6 Astra and GPT-6.1 Sol.
On OpenAI's internal benchmark at low reasoning effort, the error rate fell from 53.6% with GPT-5.6 Terra to 16.7% with GPT-6.1 Terra. At maximum effort the error rate dropped 18 percentage points to 4.3%, nearly matching GPT-6 Astra and GPT-6.1 Sol.
GPT-6.1 Terra scored 50.3% on Terminal-Bench 4.0 at maximum reasoning effort, versus 21.5% for GPT-5.6 Terra, according to bleepingcomputer.com.
Quick answers
How much does GPT-6.1 Terra cost via the API?
GPT-6.1 Terra is priced at $1 per million input tokens and $5 per million output tokens.
Where can I use GPT-6.1 Terra?
It is available to Plus, Pro, Enterprise and Edu users in ChatGPT Work and Codex, and via the API as gpt-6.1-terra.
How does GPT-6.1 Terra compare to GPT-5.6 Terra on benchmarks?
It scored 15 percentage points higher on the Agents' Last Exam at medium reasoning effort and 50.3% on Terminal-Bench 4.0 at maximum effort, versus 21.5% for GPT-5.6 Terra.