SemiAnalysis launches GDPx, a 206-task expert-work benchmark where the best model scores 12%

Claude Opus 5.5 leads at 12.0%, ahead of Gemini 4 Carbon at 10.9% and GPT-6 Astra at 9.6%, across 11 domains such as chip design, cybersecurity, biology, finance and law; the leaderboard will be refreshed every three to six months.