Gemini 3.5 Flash triples Flash pricing to $1.50 / $9

Gemini 3.5 Flash is priced at $1.50 per million input tokens and $9 per million output tokens - 3x the $0.50 / $3 of Gemini 3 Flash, but still roughly 40% cheaper than Gemini 3.1 Pro. Google has signaled it intends to use 3.5 Flash as a broad default across surfaces.