Head-to-Head App Test Highlights Speed-vs-Thoroughness Split Between OpenAI's GPT-5.6 Sol and Anthropic's Claude Fable 5

A side-by-side experiment building the same application from an identical prompt has crystallized the emerging contrast between OpenAI's GPT-5.6 Sol and Anthropic's Claude Fable 5: Sol moved roughly twice as fast at the same reasoning level, while Fable pursued a slower, more exhaustive path.