GPT-5.6 Sol vs Claude Fable 5: Which Model Writes Better Plans?
SMRTR summary
GPT-5.6 Sol outscored Claude Fable 5 on all three system-design planning tasks, averaging 9.10 versus 8.04, by catching internal contradictions in its own plans through an unprompted self-audit loop. Fable 5 produced faster, more buildable plans in about 15 minutes, but missed critical flaws between sections. GPT-5.6 Sol took nearly 53 minutes on average and cost 13% more, but delivered stronger, more reliable architectural guarantees.
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