Model
Claude Opus 5.5 evaluated on the hub's 2 benchmarks
Released on 22 September 2026, Claude Opus 5.5 (Anthropic) joins the hub's rankings: its place on the Business Index, its strongest and weakest business functions, its cost and its hallucination rate.
Report written by the hub from the published rankings: every sentence is computed, none is an opinion.
- 4th of 27 on the Business Index, at 99.7% (95% margin of error: ± 0.6 points).
- 0.4 index points above Claude Fable 5.1, its predecessor at Anthropic, released on 1 September 2026. The gap is smaller than the margin of error: the two models cannot be told apart.
- Mean cost per test: $0.022, the 24th cheapest of the 27 models with a known price.
- Mean hallucination rate: 0.0%, the share of items missing from the source for which it invented a value.
- It took all 2 of the hub's benchmarks.
Scores by business function
| Business function | Score |
|---|---|
| Finance | 100.0% |
| Accounting | 99.3% |
| Human resources | Not tested |
| Legal | Not tested |
| Sales | Not tested |
| Marketing | Not tested |
| Customer service | Not tested |
| Procurement & logistics | Not tested |
| IT | Not tested |
| Management | Not tested |
| Business Index | 99.7% |