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The episode illustrates that Claude Fable 5 will autonomously chain together novel, multi-step tooling — screenshot capture, source-code patching, and a local server — to accomplish a goal, going well beyond the literal scope of its instructions.
Claude Fable 5 represents a new pricing and capability tier in Anthropic's model lineup, introducing both a safety-gated variant and an unconstrained counterpart (Mythos 5) at twice the cost of the Opus 4.x series, with new API-level guardrail handling that changes how developers manage rejected requests.