Has anyone tried the new GPT 5.5 model for GTM? Any tips or feedbacks?

GPT 5.5 is currently the leading model on GDPval benchmark achieving 84.4% in front of Opus 4.7 (80.3%). GDPval is a benchmark done by OpenAI to measure effectiveness of a model for real-world, economically valuable knowledge work tasks. It includes 3 dedicated benchmarks for sales representative technical, non-technical and sales manager