# Anthropic releases Claude Fable 5.2, which builds a US water safety map

> Original title: 🚨 BREAKING: Anthropic has released Claude Fable 5.2

- Source: Allie K. Miller
- Published: 2026-11-09T19:04:01.000Z
- Bad Influence: https://badinfluence.news/items/zsgoko8ub8qgvj5a6elpisp3a
- Original: https://x.com/alliekmiller/status/2119868629818757417

## Summary

Anthropic has released Claude Fable 5.2, according to Allie K. Miller, who tested it by having it build a nationwide water safety map from one prompt. The map pulls federal data from the EPA, USGS, NOAA, FEMA, and the Census Bureau, rates 3,100 counties and more than 900 city areas on 17 measures, and ranks Indianapolis, Indiana highest, with Cleveland about a tenth of a point behind.

## Post

🚨 BREAKING: Anthropic has released Claude Fable 5.2 

I tested the new model and had it build a nationwide water safety map for me.

My question was which big American cities are best set up for water in the next few decades. The #1 answer, according to the model it built out, is...

Indianapolis, Indiana.

From one prompt, it scoured federal data across the EPA, USGS, NOAA, FEMA, and the Census Bureau (more than 5 GB, including 15.5 million EPA violation records and 2 million PFAS test results). Then I had a dozen other AI agents check its work (which found some errors, like Alaska’s North Slope getting a high score because its temperature data was missing).

The final map rates 3,100 counties and more than 900 city areas on 17 measures. On an aggregate score between water supply, climate outlook, water quality, testing and oversight, and backup, Indianapolis scored the highest. Cleveland trails by about a tenth of a point, with Cincinnati, St. Louis, and Nashville right behind.
It is insane to me that I can have a research question in my head and get this level of insight hours later.

The new model also built out this trailer video below.

[Video](https://badinfluence.news/api/img-proxy?u=https%3A%2F%2Fpbs.twimg.com%2Famplify_video_thumb%2F2119669941263597569%2Fimg%2FNH-KdmezY0_-YkbS.jpg&mode=thumb&exp=1794528000&sig=fd0df02060fd8cb6)