Claude Fable 5.1 edges out GPT-6 Astra on Intelligence Index

DeepLearning.AI @DeepLearningAIOriginally posted 2026.09.15

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Claude Fable 5.1 held on to the number one spot on Artificial Analysis’ Intelligence Index v4.2, and tied with OpenAI’s new model on the updated benchmarks 🏆. What you need to know: 📊 Scores 57 on the v4.2 index, edging out GPT 6 Astra. 🔬 Achieves 52.6% on Terminal Bench Science 0.1 for agentic research. 💰 Saves costs for repeated agentic workflows via cheaper cache reads. Get the full breakdown in The Batch: https://hubs.la/Q04xy0h-0  🔗 #DeepLearningAI #Anthropic #AIAgents