GPT-5.6 Soul beats Claude Fable in real-world AI test by prioritising collaboration

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Product executive and AI podcaster Claire Vo conducted a structured head-to-head comparison between OpenAI's GPT-5.6 Soul and Anthropic's Claude Fable in 2026, testing them on tasks she performs daily, including writing product requirement documents, prototyping apps, and debugging code. Her scoring combined an LLM-as-judge evaluation with her own hand-graded assessments, weighted 70% toward her personal judgment. Despite Claude Fable ranking higher on raw intelligence, Vo found it overly rigid and difficult to collaborate with, describing its output as readable only by agents rather than humans. GPT-5.6 Soul won because it communicated naturally, adapted when redirected, and delivered functional results without getting stuck in theoretical precision. Vo's key conclusion was that a model's collaborative usability is itself a core capability, not a secondary feature.

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