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Family2 measured versions

GPT Terra

5thout of 71General intelligence, its best version: GPT-6.1 Terra, index 168.1
Measured versions22 with a profile
First release9/7/2026GPT-5.6 Terra
Latest release26/10/2026GPT-6.1 Terra

Lineage

Company
OpenAI
Assistants that offer its latest version
ChatGPT

Versions without a link: below the threshold for a profile (3 public measurements, or a place in the top 10 of a benchmark).

GPT Terra versions, general intelligence and release date

Epoch AI ECI index and its 95% interval; 2 versions released in 2026 and measured by the ECI index, the most recent highlighted; the rank of each version in each benchmark, in the "Table" tab

JulAugSepOctNov160165170General intelligence index (ECI)GPT-6.1 TerraGPT-5.6 Terra

Dot: the index measured, at the release dateLine: the 95% interval

Sources: Epoch AI, "Capabilities & benchmarking"; LMArena. CC BY 4.0 licence.

AI Impact, by Projet Celsius

Rank among models released in 2026 and measured by the benchmark. Sources: Epoch AI and LMArena (CC BY 4.0), data as of 10 November 2026. An underlined name links to the version profile.

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