Gemini 3.8 Flash

Gemini 3.8 Flash is Google's workhorse Flash release, shipped September 2, 2026 as gemini-3.8-flash. It holds the $0.75 per million input and $3.75 per million output that Gemini 3.7 Flash introduced, with one difference that changes how you should model it: Google printed the expiry. The introductory rate runs through December 31, 2026, and on January 1, 2027 both sides double to $1.50 and $7.50. Batch and Flex are half those rates and Priority is 1.8x. If you are sizing a Flash-tier workload for next year, the number to budget is the post-January one, and if you are choosing between Flash tiers on price alone, the choice you make in September expires in fifteen weeks. The model takes text, image, audio, video, and PDF input with a 1,048,576 token context window and 65,536 output tokens. Artificial Analysis measures GPQA Diamond at 95.3 for the high reasoning tier, which puts it within a point of frontier flagships at roughly a thirteenth of the input price, and Google reports SWE-bench Pro at 61.6 with sharp coding and terminal gains over 3.7 Flash. A separate Cyber variant shipped alongside it behind Fairwind gating and is not part of the standard endpoint.