Models in the fingerprint bank
The identify tool can recognise 14 models across 2 families, from 504 recorded answers. Each entry links to that model's own page: its favourite numbers, its full distribution, and how reliably it is recognised.
Bank version 2026.09.1. New models are added as they are collected; every change is listed on the changelog.
Catalogue
| Model | Family | Collected through | Answers | Status |
|---|---|---|---|---|
GPT-5.4gpt-5.4 |
GPT | API | 36 | Inherited from ModelTrace; serving identity not independently verified |
GPT-5.5gpt-5.5 |
GPT | API | 36 | Inherited from ModelTrace; serving identity not independently verified |
GPT-5.6 Solgpt-5.6-sol |
GPT | API | 36 | Inherited from ModelTrace; serving identity not independently verified |
GPT-5.6 Terragpt-5.6-terra |
GPT | API | 36 | Inherited from ModelTrace; serving identity not independently verified |
GPT-5.6 Lunagpt-5.6-luna |
GPT | API | 36 | Inherited from ModelTrace; serving identity not independently verified |
GPT-6 Astragpt-6-astra |
GPT | API | 36 | Inherited from ModelTrace; serving identity not independently verified |
Claude Haiku 4.5claude-haiku-4-5-20251001 |
Claude | API | 36 | Inherited from ModelTrace; serving identity not independently verified |
Claude Sonnet 4.6claude-sonnet-4-6 |
Claude | API | 36 | Inherited from ModelTrace; serving identity not independently verified |
Claude Sonnet 5claude-sonnet-5 |
Claude | API | 36 | Inherited from ModelTrace; serving identity not independently verified |
Claude Opus 4.6claude-opus-4-6 |
Claude | API | 36 | Inherited from ModelTrace; serving identity not independently verified |
Claude Opus 4.7claude-opus-4-7 |
Claude | API | 36 | Inherited from ModelTrace; serving identity not independently verified |
Claude Opus 4.8claude-opus-4-8 |
Claude | API | 36 | Inherited from ModelTrace; serving identity not independently verified |
Claude Opus 5claude-opus-5 |
Claude | API | 36 | Inherited from ModelTrace; serving identity not independently verified |
Claude Fable 5.1claude-fable-5-1@claude-code |
Claude | Claude Code | 36 | Collected by this project |
What the status column means
Thirteen entries were inherited from the ModelTrace project. Their answers were collected through an API relay whose serving identity was never independently confirmed, so they are marked as inherited rather than verified. That does not make them wrong: their fingerprints hold up in held-out testing exactly as the project's own do. It means the label on the tin is the one the relay reported.
A model collected by this project was answered by one independent session per challenge, with nothing carried over between them. The channel column says how the answers were obtained. A fingerprint tracks the model rather than the channel, so an entry collected through one channel still recognises the same model through another.