Agentic benchmark
Toolathlon Verified avg. turns leaderboard
Toolathlon Verified average assistant turns. Every model the catalog carries a published Toolathlon Verified avg. turns value for, ranked by that value.
CategoryAgentic
MeasureAverage trajectory length
Tasks108 verified real-world tool-use tasks
DifficultyLong-horizon application tool use
Published byClaude Opus 5 System Card
Average assistant turns per Toolathlon Verified trajectory.
Toolathlon Verified avg. turns ranking
2 models with a published Toolathlon Verified avg. turns value, ordered by that value, highest first. Models the source has not scored on this benchmark are not listed — they are unmeasured, not last.
| Rank | Model | Provider | Average trajectory length |
|---|---|---|---|
| 1 |  Claude Fable 5.1 | Anthropic | 23.7 |
| 2 | Claude Opus 5 | Anthropic | 23.5 |
Evidence key: Observed
Rows are ordered by the value Claude Opus 5 System Card published, highest first. The source does not state whether a higher value is the better result, so this page does not either: for a benchmark that measures a rate of failure, read the table from the bottom.