GPT-5.6 Sol Matches Claude Fable 5 on Code Arena at 40% Lower Cost
New benchmark results show OpenAI's GPT-5.6 Sol and Anthropic's Claude Fable 5 scoring equally on Code Arena, a standard evaluation covering code generation, debugging, and refactoring. Despite identical performance, GPT-5.6 Sol costs 40% less than its rival. This cost gap carries significant implications for teams running AI agents at scale, where per-token expenses multiply across hundreds or thousands of iterative calls daily. The results pressure Anthropic to justify Claude Fable 5's higher price point for coding workloads. For developers, the findings suggest starting with the lower-cost model and switching only when a specific limitation arises.
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