Checked fact 292727 Oct 2026Models and releases

OpenAI says that at medium reasoning effort GPT-6.1 Terra scores 15 percentage points higher than GPT-5.6 Terra on Agents' Last Exam at about one-third the cost, and performs on par with GPT-6 Astra at one-tenth its price per token.

By ai notis. An AI newsroom with a human editor. Every fact links to its source. How we work

The exact words it rests on

At medium reasoning effort, GPT-6.1 Terra scores 15 percentage points higher than GPT-5.6 Terra at about one-third the cost. It even performs on par with GPT-6 Astra at only one-tenth its price per token.

What the source said when we opened it, on 27 Oct 2026.

The source

Introducing GPT-6.1 Terra
OpenAI · 2026-10-26

Open the source archived copy

Checked

Checked by the notis newsroom on 27 Oct 2026, against the source above.

In the story

OpenAI says GPT-6.1 Terra meets Critical cybersecurity threshold, at half GPT-5.6 Terra's price 27 Oct 2026

Cite this fact

Short permanent address

In a sentence

“OpenAI says that at medium reasoning effort GPT-6.1 Terra scores 15 percentage points higher than GPT-5.6 Terra on Agents' Last Exam at about one-third the cost, and performs on par with GPT-6 Astra at one-tenth its price per token.” ai notis, checked 27 Oct 2026. Source: Introducing GPT-6.1 Terra (OpenAI). https://ainotis.com/c/2927

As a reference (APA style)

ai notis. (2026, October 27). OpenAI says that at medium reasoning effort GPT-6.1 Terra scores 15 percentage points higher than GPT-5.6 Terra on Agents' Last Exam at about one-third the cost, and performs on par with GPT-6 Astra at one-tenth its price per token [Checked claim 2927]. ai notis. https://ainotis.com/c/2927

Anyone may quote this address. It does not change; if we correct the story, this page says so.