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The safeguard architecture means Fable 5's cybersecurity performance is effectively equivalent to Opus 4.8 rather than the full Mythos 5 model, making the practical capability gap between the general-release and partner-only versions larger than benchmark numbers alone suggest.
FrontierCode represents a stricter standard for evaluating AI coding agents by requiring production-quality, review-ready code rather than just functional correctness — and the low scores even from leading models show the benchmark is far from saturated.