# Anthropic Fixed Fable 5.1's Worst Problems...So Why Am I Staying With Opus?

> Source: <https://uk.pcmag.com/ai/167073/anthropic-fixed-fable-51s-worst-problemsso-why-am-i-staying-with-opus>
> Published: 2026-09-03 16:04:18+00:00

I put Fable 5.1 through its paces after its big comeback. The upgrades are impressive, but my subscription is staying right where it is.

Fable is perhaps the most intriguing AI model to date. Anthropic positioned it as the world’s most powerful LLM, comparable only with its big sibling, Mythos, which was too powerful for a public release. Then