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# Claude Opus 4.5 led τ-bench's tool-use tasks at 70.2% in early 2026; the top seven span 7.3 points
- URL: https://aiadoption.org/data/tau-bench-tool-use-agents/
- Published: 2026-10-19T16:06:00.000Z
- Updated: 2026-10-21T06:01:06.000Z
- Description: On τ-bench, where agents talk to a user and use tools under company policy rules, Claude Opus 4.5 scored 70.2% in early 2026, ahead of GPT-5.2 at 69.9%. No model shown passed 71%.
- Author: Manu
- Tags: Data, AI Benchmarks, AI Agents, #chart, #ai-index-2026, #hub-benchmarks, #topic-ai-agents

70.2%

#1 of 7

τ-bench pass@1 of Claude Opus 4.5, the highest of the top seven; GPT-5.2 scored 69.9%

Claude Opus 4.570.2%

GPT-5.269.9%

Claude Sonnet 4.562.9%

## What the chart shows

τ-bench places an agent in domains such as retail and airline customer service, with databases, policy rules and a multiturn conversation with a user, and checks whether the end result, often the database state, is correct. Claude Opus 4.5 led at 70.2%, ahead of GPT-5.2 (69.9%) and Qwen3.5-397B-A17B (68.4%).

The top seven span 7.3 percentage points, down to Claude Sonnet 4.5 at 62.9%. Pass@1 counts success on a single attempt, so even the leader fails about three in ten tasks.

## Key numbers

| Measure                | Value                 |
| ---------------------- | --------------------- |
| Claude Opus 4.5        | 70.2%                 |
| GPT-5.2                | 69.9%                 |
| Qwen3.5-397B-A17B      | 68.4%                 |
| Gemini 3 Flash         | 67.8%                 |
| Claude Sonnet 4.5, 7th | 62.9%                 |
| Gap, 1st to 7th        | 7.3 percentage points |

## How to read it

- Scores are from the τ-bench text leaderboard, as cited by the AI Index, which shows the top seven models.
- Success is judged on the final outcome, which is often verifiable from the database state.

**Source:** [τ-bench Leaderboard](https://aiadoption.org/sources/#tau-bench), 2026, via the AI Index Report 2026 (Stanford HAI), figure 2.6.6: *τ-bench: pass@1*. Chart and text by AI Adoption.  
Numbers checked against the published data on 20 October 2026.  
[Download the data (CSV)](https://charts.aiadoption.org/ai-index/csv/tau-bench-tool-use-agents.csv?ref=aiadoption.org) · [Cite this chart](#source)