I put 402 PDF files and used nearly 400,000 tokens, I'd like to combine them and analysis these files then get some good series of knowledge, but it happened errors again and again

An internal error has occurred. I used Gemini Experimental 1206. It contains most tokens, but it doesnt work, how could I do for the next step

Welcome to the forum.
Right now, everyone is getting a very high rate of http 500 error returns from model gemini-exp-1206. We have to wait it out until the data center operators fix the problem. Hope that helps.

Model gemini-exp-1206 is back in service, thank you.