GPT-5.5
Lineage
- Company
- OpenAI
- GPT (before the Astra, Sol, Terra, Luna range) family
- GPT-5.4GPT-5.4 ProGPT-5.5GPT-5.5 Prothe family
- Assistants that offer it
- No assistant in the ranking names it on a page we have read.
- 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 index160.1158.0 to 162.419th out of 71
- User preferenceLMArena, Elo score148124th out of 68
- Agent tasksEpoch AI, APEX-Agents55.1 %44.3 to 65.923rd out of 52
- Code repairEpoch AI, DeepSWE67.0 %11th out of 26
- Coding tasksEpoch AI, CursorBenchnot measured
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 |
|---|---|---|---|
| DeepSWE, code repair | |||
| low | not estimated | 27.0 % | 9,443 |
| medium | not estimated | 54.0 % | 19,625 |
| high | not estimated | 64.4 % | 31,159 |
| xhigh | not estimated | 67.0 % | 46,295 |
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-5.5 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-5.55 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 →ModelOpenAIGPT-5.427thout of 71 on general intelligenceThe previous version of GPT (before the Astra, Sol, Terra, Luna range).The entry →AssistantChatGPT62out of 100, 3rd out of 10OpenAI's assistant; no page we have read says that it offers GPT-5.5.The entry →The hub newsletter
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