AI benchmarks and leaderboards are different things
Learn the difference between a benchmark, an evaluation run and a leaderboard, and use each to answer the right question.
Model reports
BioMysteryBench
Reported in two splits ("hard" and "human solved") that differ by more than 35 points, so a bare score is unreadable without its split. Anthropic notes its own safety refusals depress this number, which means the score mixes capability with policy. First-party to Anthropic, which built it and publishes the dataset. The task set was revised after an answer-key audit, so the item count moved and scores are not comparable across dataset versions.
Evaluation context and evidence
- Source
- Model reports
- Publisher
- Not recorded
- Benchmark release
- 2026-04-29
- Collected
- Not recorded
- Modality
- Not recorded
These are source-reported observations, not independent reruns by this site. Check the task version, evaluation protocol, unit and reporting date before comparing models. Results from different setups are not a universal ranking.
Original sources
Reported results 1
Shown in source observation order, not ranked. Dates retain the precision provided by the source.
| Model | Value | Unit | Protocol | Reported date and basis | Source |
|---|---|---|---|---|---|
| Hy4 preview | 71.3 | percent | as printed in the report's benchmark table | 2026-08-28 · document_publication | Hy4 preview |