Three latest flagship large models go head-to-head in financial investment practice: GPT-5.5, Opus 4.7, DeepSeek V4 Pro. Which one is better for coding, backtesting, reading research reports, and conducting cross-asset analysis? If you're using AI for investment research, quantitative backtesting, financial report analysis, or supply chain tracking, this video will directly tell you which model is the most worth using and why DeepSeek might actually be the real winner.