On X, benchmark account scaling01 said OpenAI's GPT-5.6 Sol is "beating Fable 5 in both cost and performance on DeepSWE 1.1," while a broader GPT-5.6 benchmarks post pointed to a wider set of comparisons. The same account also posted that GPT-5.6 Sol was "slightly worse" on the Artificial Analysis Intelligence Index but much cheaper, and later called it "a clear step-up from GPT-5.5 on ProgramBench".