Toolathlon Verified average assistant turns (Toolathlon Verified avg. turns)
We show this table for reference; we do not rank on it.
Average assistant turns per Toolathlon Verified trajectory.
Benchmark score on Toolathlon Verified avg. turns — September 27, 2026
We compile the Toolathlon Verified avg. turns rows from provider self-reports. Claude Opus 5.5 leads the table at 26.9 turns, followed by Claude Fable 5.1 (23.7 turns) and Claude Opus 5 (23.5 turns). We do not use these results to rank models overall.
Claude Opus 5.5
Anthropic
Claude Fable 5.1
Anthropic
Claude Opus 5
Anthropic
3 modelsAgenticCurrentDisplay onlyUpdated September 27, 2026
Benchmark score table (3 models)
ScoreAmong the reported Toolathlon Verified avg. turns rows, Claude Opus 5.5 is first at 26.9 turns. The third row is 3.4 points behind. The broader top-10 range is 3.4 points, so many of the published results sit in a relatively narrow band.
3 models have been evaluated on Toolathlon Verified avg. turns. The benchmark falls in the Agentic category. Toolathlon Verified avg. turns is currently displayed for reference but excluded from the scoring formula, so it does not directly affect overall rankings.
About Toolathlon Verified avg. turns
Year
2026
Tasks
108 verified real-world tool-use tasks
Format
Average trajectory length
Difficulty
Long-horizon application tool use
Table 8.13.6.A reports trajectory length as context for the benchmark's long-horizon tool-use scores.
Freshness and provenance
Version
Toolathlon Verified avg. turns 2026
Refresh cadence
Quarterly
Staleness state
Current
Question availability
Public benchmark set
BenchLM uses freshness metadata to decide whether a benchmark should still be treated as a strong differentiator, a benchmark to watch, or a display-only reference. For the full scoring policy, see the BenchLM methodology page.
Questions
What does Toolathlon Verified avg. turns measure?
Average assistant turns per Toolathlon Verified trajectory.
Which model scores highest on Toolathlon Verified avg. turns?
Claude Opus 5.5 by Anthropic currently leads with a score of 26.9 turns on Toolathlon Verified avg. turns.
How many models are evaluated on Toolathlon Verified avg. turns?
3 AI models have been evaluated on Toolathlon Verified avg. turns on BenchLM.
Compare top models on Toolathlon Verified avg. turns
Know when it’s worth switching models
The model to choose, the cheaper alternative, and the release we would wait on.
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