Tool use & function calling

Tau-bench

Realistic tool-agent user interactions in airline, retail, and banking domains; scores are agent-system results, not model-only capability.

How models are tested

Scores are published numbers from the sources below. They are only comparable when the evaluation version, tools, agent harness, and sampling setup match. Missing scores are omitted rather than treated as zero.

Category: Tool use & function calling
Metric: Percent
Direction: Higher is better
Coverage: 3 / 318Models in this catalog with a published score
Updated: 2026-09-29Catalog snapshot date
Source: github.com/sierra-research/tau-bench

Scores

1
Qwen3.8 Max
Alibabaopen
55.2%
2
Claude Opus 5
Anthropicclosed
48.7%
3
Grok 4.5
xAIclosed
47.9%

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