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Data

Toolathlon Verified average assistant turns (Toolathlon Verified avg. turns)

We show this table for reference; we do not rank on it.

Data verified

Average assistant turns per Toolathlon Verified trajectory.

Benchmark score on Toolathlon Verified avg. turns — November 13, 2026

We compile the Toolathlon Verified avg. turns rows from provider self-reports. Claude Sonnet 5.5 leads the table at 31.6 turns, followed by Claude Opus 5.5 (26.9 turns) and Claude Fable 5.1 (23.7 turns). We do not use these results to rank models overall.

1Closed

Claude Sonnet 5.5

Anthropic

Reported by Anthropic
31.6 turns
Overall 83.05Context 1M
2Closed

Claude Opus 5.5

Anthropic

Reported by Anthropic
26.9 turns
Overall 86.62Context 1M
3Closed

Claude Fable 5.1

Anthropic

Reported by Anthropic
23.7 turns
Overall 79.21Context 1M

4 modelsAgenticCurrentDisplay onlyUpdated November 13, 2026

Benchmark score table (4 models)

All 4 results on this page were reported by the labs that built the models.

Benchmark score results for Toolathlon Verified avg. turns
RankModel / configurationScoreParameters (B)Open / closed
1Claude Sonnet 5.5AnthropicReported by Anthropic
31.6 turns
Not reportedClosed
2Claude Opus 5.5AnthropicReported by Anthropic
26.9 turns
Not reportedClosed
3Claude Fable 5.1AnthropicReported by Anthropic
23.7 turns
Not reportedClosed
4Claude Opus 5AnthropicReported by Anthropic
23.5 turns
Not reportedClosed
  • Lab-reported
  • Benchmark-run
  • Independent
What the labels mean

Among the reported Toolathlon Verified avg. turns rows, Claude Sonnet 5.5 is first at 31.6 turns. The third row is 7.9 points behind. The broader top-10 range is 8.1 points, so many of the published results sit in a relatively narrow band.

4 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.

Claude Opus 5 System Card

Freshness and provenance

Version

Toolathlon Verified avg. turns 2026

Refresh cadence

Quarterly

Staleness state

Current

Question availability

Public benchmark set

CurrentDisplay only

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 Sonnet 5.5 by Anthropic currently leads with a score of 31.6 turns on Toolathlon Verified avg. turns.

How many models are evaluated on Toolathlon Verified avg. turns?

4 AI models have published results on Toolathlon Verified avg. turns in the BenchLM catalog.

Compare top models on Toolathlon Verified avg. turns

Claude Sonnet 5.5 vs Claude Opus 5.5Claude Opus 5.5 vs Claude Fable 5.1Claude Fable 5.1 vs Claude Opus 5
Last updated: November 13, 2026 · BenchLM version Toolathlon Verified avg. turns 2026

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