---
type: NewsArticle
title: "Claude Fable 5 vs. Opus 4.8 vs. GPT-5.5: The Numbers"
description: "Benchmark comparison of Claude Fable 5, Opus 4.8, and GPT-5.5: SWE-Bench Pro, analytics, speed, and the cost-per-point math behind the 2x price."
resource: "https://yippy.com/t/nr5f4t4xxzhg/"
locale: en
published: "2026-06-09T18:39:43.837Z"
timestamp: "2026-07-07T14:50:36.308Z"
tags:
  - "ai"
  - "anthropic"
  - "claude"
  - "claude-fable-5"
  - "coding"
  - "machine-learning"
  - "openai"
entities:
  - "https://www.anthropic.com"
  - "https://en.wikipedia.org/wiki/Artificial_intelligence"
  - "https://en.wikipedia.org/wiki/Machine_learning"
---

# Claude Fable 5 vs. Opus 4.8 vs. GPT-5.5: The Numbers

Fable 5 posts 80.3% on SWE-Bench Pro against 69.2 for Opus 4.8 and 58.6 for GPT-5.5. We ran the price-per-point math so you do not have to.

**Contents**

- The headline numbers
- Context: the gap was visible in April
- The price-per-point math
- Where Opus 4.8 still makes sense
- Bottom line
- Update: July 7, 2026

Full text: https://yippy.com/t/nr5f4t4xxzhg/