The xhigh model is priced at less than half the cost of the previous Opus 5 iteration. The WeirdML v3 benchmark consists of 11 complex hand-made tasks that require models to develop machine learning and data analysis pipelines to handle unfamiliar data with limited feedback or unspecified goals.
Wednesday, October 21, 2026
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Claude Opus 5.5 Trails GPT 6 Astra With 31.2% WeirdML Score
AI26 days ago
The latest version of a high-end AI model for agentic reasoning outscored Fable's newest release on a recent industry benchmark. Claude Opus 5.5 (xhigh) recorded a 31.2% score on the WeirdML v3 test, surpassing the 26.0% result of Fable 5.1 but trailing the 42.2% performance of GPT 6 Astra.
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