For the past few years, investing in artificial intelligence has largely meant buying a handful of companies that sit underneath it.

SpaceX, Anthropic, Open AI, Google are mopping up huge sums from the market riding on the AI promise

OpenAI joined its two mega peers in filing for a blockbuster IPO that could value the ChatGPT creator at more than $1tn as it races rival Anthropic to list its shares publicly,…