Claude Fable 5 vs GPT-5.5: Should You Use the New Model for Everything?
SMRTR summary
Claude Fable 5 proved better at planning than GPT-5.5, scoring 9.1 vs. 8.3 on a structured rubric, largely because it made sharper design decisions and caught subtle failure modes. However, when both models implemented that same plan, they produced identical results passing all 15 acceptance checks. GPT-5.5 completed execution at $6.30 vs. Fable 5's $16.66, making a mixed approach — plan with Fable 5, build with GPT-5.5 — 59% cheaper overall.
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