Models · Claude
Claude Haiku 5.5
Asked for a few hundred random integers, Claude Haiku 5.5 does not pick evenly. This page is the shape of that preference, built from 36 recorded answers containing 10608 numbers, and it is what the identify tool compares a pasted reply against.
- Bank id
claude-haiku-5-5- Family
- Claude
- Collected through
- API
- Collected on
- 2026-10-09
- Status
- Inherited from ModelTrace; serving identity not independently verified
- Distinct values used
- 355 of 355
- Prompt environments
- 12 of 12
Capability and price
- Sold by
- Anthropic
- Intelligence index
- 43 · v4.3.2, scored as Max
- Index rank
- 7 of 12
- Input, per 1M tokens
- 0.10
- Output, per 1M tokens
- 0.50
- Blended, per 1M tokens
- 0.20
- Price rank
- 1 of 12
- Context window
- 1,000,000 tokens
These rates apply to prompts up to 100,000 tokens. Above that, input costs $0.50 and output $2.50 per million tokens.
Read on 2026-10-17, not measured here: index page · price page
Distribution
Selected number 88
| Model | Times chosen | Share |
|---|---|---|
| Claude Haiku 5.5 | 65 | 0.61% |
Favourite numbers
| Number | Times chosen | Share |
|---|---|---|
| 88 | 65 | 0.61% |
| 118 | 62 | 0.58% |
| 58 | 60 | 0.57% |
| 240 | 60 | 0.57% |
| 170 | 57 | 0.54% |
| 311 | 57 | 0.54% |
| 268 | 56 | 0.53% |
| 309 | 55 | 0.52% |
| 201 | 54 | 0.51% |
| 178 | 52 | 0.49% |
| 199 | 52 | 0.49% |
| 91 | 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 with a clear margin, 0 were close calls inside its family, 0 had only a weak match, and 0 named a different model with a clear margin.
With this model removed from the bank and its own answers scored against the rest, 0 of 12 runs still named another model with a clear margin, 0 were close calls inside the family, and 12 had only a weak match. Its answers landed most often on Claude Opus 5.5 (4 of 12). That is the number to keep in mind if you are testing a version that is not listed here.
Uses 36 upstream ModelTrace 6cd4a8f replies collected on 2026-10-09 through the declared OAIPro relay. Cross-validation is 36/36, 36/36 and 12/12 at 1/2/3 replies; no independent holdout or first-attempt rate is available. v2026.10.3 follows the Owner’s upstream-first decision despite Astra three-reply CV changing 9/12→8/12. Provenance is declared, not independently attested.
Both measurements count the status the site attaches to the first-ranked model, not the bare ranking alone. The methodology page explains how they were made and what they leave out.