---
title: "Surprise upset: GPT-5.5 beats Claude Fable 5 on brutal new Agents’ Last Exam benchmark"
date: 2026-06-10
source: http://www.bing.com/news/apiclick.aspx?ref=FexRss&aid=&tid=6a29f493cbf148bd812009edaadbc739&url=https%3a%2f%2fventurebeat.com%2ftechnology%2fsurprise-upset-gpt-5-5-beats-claude-fable-5-on-brutal-new-agents-last-exam-benchmark&c=17801436421773913604&mkt=en-us
description: "The victory of GPT-5.5 aligns with recent third-party analysis suggesting that OpenAI's models are currently superior at strictly adhering to multi-part, complex prompts."
---

# Surprise upset: GPT-5.5 beats Claude Fable 5 on brutal new Agents’ Last Exam benchmark

The victory of GPT-5.5 aligns with recent third-party analysis suggesting that OpenAI's models are currently superior at strictly adhering to multi-part, complex prompts.

*Published: 2026-06-10*