WHAT HAPPENED TO THE MISSING GEMINI 3.5 PRO MODEL THAT NEVER SHIPPED?

Summary from the TLDR AI newsletter

Google had both Flash and Pro versions of the 3.5 series. However, there were gaps in the model's agentic capabilities, particularly around coding. The team felt the fastest way to climb that hill was to use Flash, as the smaller model allowed for more iterative loops. By the time the team had improved Flash's abilities, Argon pre-training was done.