# Claude Fable 5.2 sets Epoch Capabilities Index record at 174

> Original title: Claude Fable 5.2 sets a new record on the Epoch Capabilities Index (ECI) at 174. The previous high was GPT-6 Astra’s 169. Fable 5.2’s sco...

- Source: Epoch AI
- Published: 2026-11-09T21:22:14.000Z
- Bad Influence: https://badinfluence.news/items/bry4co6c6v2hl3pmbqxvla2mo
- Original: https://x.com/EpochAIResearch/status/2119903415363113088

## Summary

Epoch AI reports that Claude Fable 5.2 scores 174 on the Epoch Capabilities Index, a new record above GPT-6 Astra's previous high of 169. Epoch says the score exceeds what the pre-Astra trend for reasoning models would have predicted. The ranking is based on Epoch's own benchmarks run before launch, and the index may change as more results are added.

## Post

Claude Fable 5.2 sets a new record on the Epoch Capabilities Index (ECI) at 174. The previous high was GPT-6 Astra’s 169. Fable 5.2’s score is above what the pre-Astra trend for reasoning models would have predicted.

This is notable given recent discussion of AI contributions to AI R&D, and we hope to release more work in this area soon.

This is based on testing we did prior to launch using only our own benchmarks. The ECI is continually updated as more benchmark results become available, and may change in the future.

![](https://badinfluence.news/api/img-proxy?u=https%3A%2F%2Fpbs.twimg.com%2Fmedia%2FHWto7BnaEAAcolF.jpg&mode=thumb&exp=1794528000&sig=6edb361d3ed49bdf)