Lineage
- Company
OpenAI- GPT Terra family
- GPT-5.6 TerraGPT-6.1 Terrathe family
- Assistants that offer it
- ChatGPTselectable, Free and Go (limited, Work and Codex on desktop), Plus, Pro (official page ↗)
- API price
- not recorded
Links read on 10/11/2026 on company pages, the press as a fallback; a link given for a family applies only to its latest version.
Rank in each benchmark
- General intelligenceEpoch AI, ECI index160.9158.6 to 163.316th out of 71
- User preferenceLMArena, Elo score146831st out of 68
- Agent tasksEpoch AI, APEX-Agents58.2 %47.8 to 68.619th out of 52
- Coding tasksEpoch AI, CursorBench41.3 %14th out of 18
- Code repairEpoch AI, DeepSWE69.6 %6th out of 26
Each segment of the bar is worth a tenth of the ranking; the 1st groups the best ranked. Rank among models released in 2026 and measured by the benchmark. Sources: Epoch AI, "Capabilities & benchmarking" (CC BY 4.0); LMArena, text with style control (CC BY 4.0); data as of 10 November 2026.
Effort settings
| Setting | Electricity use of a task | Tasks completed | Tokens per task |
|---|---|---|---|
| CursorBench, coding tasks | |||
| low | not estimated | 25.2 % | 5,914 |
| medium | not estimated | 27.6 % | 7,307 |
| high | not estimated | 30.7 % | 13,162 |
| xhigh | not estimated | 33.6 % | 23,436 |
| max | not estimated | 41.3 % | 60,814 |
| DeepSWE, code repair | |||
| low | not estimated | 24.1 % | 8,572 |
| medium | not estimated | 35.1 % | 11,747 |
| high | not estimated | 53.8 % | 21,517 |
| xhigh | not estimated | 60.2 % | 39,617 |
| max | not estimated | 69.6 % | 71,939 |
Estimation methodology
The effort setting says how much the model reasons before answering: the higher it is, the more tokens it writes, and the more electricity the task needs. Tokens per task are measured by Epoch AI.
Electricity: Projet Celsius estimate. Tokens of the task × electricity ofwriting 1,000 tokens for the size of the model (AI Impact Database, IA-0011), × the data centre overhead (PUE). The scope covers computing on the servers and cooling; it does not cover chip manufacturing, training, the network or the device. CursorBench counts tokens read and written together: the range runs from "all read" to "all written". DeepSWE counts tokens written: the range starts from writing alone.
Model size unknown: electricity use is not estimated. Benchmark: a quick question to an assistant needs about 0.3 Wh.
GPT-5.6 Terra among OpenAI's models, general intelligence
Epoch AI ECI index and its 95% interval, by release date; 14 OpenAI models released in 2026 and measured by the ECI index
Dot: the index measured, at the release dateLine: the 95% intervalGPT-5.6 Terra5 names in the "Table" tab
Source: Epoch AI, "Capabilities & benchmarking", ECI index. CC BY 4.0 licence.
Continue in the ranking
The full ranking →CompanyOpenAI14models measured, of which 10 with an entryIts assistant, its models, its governance and the electricity of its data centres.The entry →FamilyOpenAIGPT Terra2measured versionsThe versions of the family, their release and their rank in each benchmark.The family →AssistantChatGPT62out of 100, 3rd out of 10The assistant in the ranking that offers GPT-5.6 Terra.The entry →The hub newsletter
This month's ranking, news on the impact of AI and one figure from the AI Impact Database. One newsletter a month at most, free of charge. Past issues
