Models · Claude
Claude Opus 5
Asked for a few hundred random integers, Claude Opus 5 does not pick evenly. This page is the shape of that preference, built from 36 recorded answers containing 10609 numbers, and it is what the identify tool compares a pasted reply against.
- Bank id
claude-opus-5- Family
- Claude
- Collected through
- API
- Status
- Inherited from ModelTrace; serving identity not independently verified
- Distinct values used
- 354 of 355
- Prompt environments
- 12 of 12
Distribution
Every bar is one value from 1 to 355; its height is how many times the model chose it across all recorded answers. A perfectly random picker would give a flat line. Nothing in the bank does.
Favourite numbers
| Number | Times chosen | Share |
|---|---|---|
| 205 | 63 | 0.59% |
| 96 | 61 | 0.57% |
| 271 | 60 | 0.57% |
| 129 | 58 | 0.55% |
| 143 | 58 | 0.55% |
| 240 | 55 | 0.52% |
| 66 | 54 | 0.51% |
| 68 | 54 | 0.51% |
| 88 | 53 | 0.50% |
| 87 | 52 | 0.49% |
| 152 | 52 | 0.49% |
| 92 | 51 | 0.48% |
How reliably it is recognised
In held-out testing across all twelve prompt environments, 12 of 12 three-answer runs named this model, 0 narrowed it to its family, 0 gave no answer, and 0 named a different model.
With this model removed from the bank and its own answers scored against the rest, 4 of 12 runs still confidently named another model, 0 stopped at the family, and 8 gave no answer. Its answers landed most often on Claude Opus 4.8 (11 of 12). That is the number to keep in mind if you are testing a version that is not listed here.
Both measurements use the open-set verdict the site applies, not the bank's raw ranking. The methodology page explains how they were made and what they leave out.