GPT-5.5 Pro vs GPT-5.6 Sol benchmarked on MineBench

User benchmark on MineBench reports GPT-5.6 Sol averages 25m 16s inference time and $47.39 per build, significantly more expensive than GPT-5.5 Pro's $223.90 total for 15 builds. GPT-5.5 Pro averaged 21m 23s for context; GPT-5.6 Sol showed slightly longer inference.