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Claude Fable 5 outpaces GPT-5.5 by 13 points on FrontierMath's toughest problems
Anthropic's Claude Fable 5 hits 88 percent accuracy on the hardest FrontierMath tier, a massive jump from Opus 4.5, which sat below 10 percent in early 2026. OpenAI's GPT-5.5 reaches about 75 percent on the same tier. The pace of improvement in AI math keeps accelerating.
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venturebeat.com
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.
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cryptobriefing.com
Claude Fable 5 ranks first in Code Arena, leading by 98 points
Anthropic's Claude Fable 5 leads Code Arena by 98 points with an 80.3% SWE-Bench Pro score, but its zero crypto integration raises questions for AI token
