Claude Fable 5 vs GPT 5.5: Benchmark Breakdown and Real-World Coding Results

The article compares Claude Fable 5 and GPT 5.5 on SWEBench Pro, Frontier Code, and real agentic coding tasks. Claude Fable 5 excels in long-context code understanding and low hallucination, while GPT 5.5 is faster on single-turn tasks.