Claude Fable 5 is Anthropic’s new Mythos-class model, and I tested it against GPT 5.5, Codex, Claude Code, and one of my hardest coding prompts. In normal chat, the difference is there but not life-changing. But once I asked it to build a realistic 3D water-globe simulation with lemon trees, real gravity, hidden Easter eggs, atmospheric sound, and a proper UI, Fable 5 produced the most complete version of this test I have ever seen.
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