🤖 Claude Fable 5 plans better, while GPT-5.5 executes cheaper
A Kilo AI study has shown that Claude Fable 5 outperforms GPT-5.5 in architectural design (9.1 vs. 8.3 on the scale), better identifying complex scenarios. While both models implement plans with similar success, GPT-5.5 is significantly more cost-effective.
🌍 The effectiveness of a hybrid approach has been confirmed: high-level design is assigned to "reasoning" models like Claude Fable 5, while code generation is handled by more economical flagships.
👤 It is more beneficial for developers to use Claude Fable 5 to create a detailed plan (plan.md) and then hand it over to GPT-5.5 for implementation. This allows for reducing development costs by nearly 60% without sacrificing quality.