# Is Claude Opus getting worse?

**As of 2026-09-04, opus-5 scored 12/12 on Winthropic's fixed 12-task battery, unchanged from the previous run.**

## Last 5 readings

| Run | opus-5 |
|---|---:|
| 2026-09-04 | 12/12 |
| 2026-09-03 | 12/12 |
| 2026-09-02 | 10/12 |
| 2026-09-01 | 11/12 |
| 2026-08-31 | 12/12 |

How this is measured: the same versioned battery, every tracked model, every morning, frozen request shape, deterministic scoring. https://winthropic.com/methodology.md

Cite: Winthropic Index, "Is Claude Opus getting worse?", reading of 2026-09-04, https://winthropic.com/is-claude-opus-getting-worse

Winthropic is an independent measurement project and is not affiliated with, endorsed by, or connected to Anthropic. Paying for output you are not getting? https://winthropic.com/audit.md prices your actual spend from a usage export; the summary is free.