# Opus 5.5 vs Fable 5.1

**URL:** https://discourse.devontechnologies.com/t/opus-5-5-vs-fable-5-1/87699
**Category:** Artificial Intelligence
**Created:** [September 23, 2026, 5:38pm UTC](https://discourse.devontechnologies.com/t/opus-5-5-vs-fable-5-1/87699 "2026-09-23T17:38:46Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![rkaplan](https://discourse.devontechnologies.com/letter_avatar_proxy/v4/letter/r/a3d4f5/32.png) [@rkaplan](https://discourse.devontechnologies.com/u/rkaplan)
#### Post date: [September 23, 2026, 5:38pm UTC](https://discourse.devontechnologies.com/t/opus-5-5-vs-fable-5-1/87699/1 "2026-09-23T17:38:46Z")

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Opus 5.5 was just released so I have not yet tried it in detail.

But I am intrigued - Anthropic’s benchmark marketing suggests Opus 5.5 is superior to Fable 5.1 and less expensive.

Why use Fable?

 ![image](https://devontech-discourse.s3.dualstack.us-east-1.amazonaws.com/uploads/original/3X/f/9/f95a3f98c9b73c151aab6baa7c1b1d7e70fe0f40.png)

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### Author: ![cgrunenberg](https://discourse.devontechnologies.com/user_avatar/discourse.devontechnologies.com/cgrunenberg/32/7172_2.png) [@cgrunenberg](https://discourse.devontechnologies.com/u/cgrunenberg)
#### Post date: [September 23, 2026, 5:51pm UTC](https://discourse.devontechnologies.com/t/opus-5-5-vs-fable-5-1/87699/2 "2026-09-23T17:51:02Z")

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It’s definitely not unusual that newer models outperform more expensive older models. And it’s a widely accepted recommendation to use the more expensive models only when absolutely necessary as most tasks don’t require them.

Anyway, I’m sure Fable 5.5 will follow rather sooner than later.