Side-by-side technical and economic comparison between Google's Gemini 3.8 Flash and Google's Gemini 3.8 Pro.
| Metric | Gemini 3.8 Flash | Gemini 3.8 Pro | Advantage |
|---|---|---|---|
| Provider Organization | — | ||
| Standard Input / 1M | $0.75 | $4.00 | Gemini 3.8 Flash (81% lower) |
| Cached Input / 1M | $0.075 | $0.40 | Gemini 3.8 Flash lower |
| Output / 1M | $3.75 | $18.00 | Gemini 3.8 Flash lower |
| Context Window | 1.05M | 1.05M | Equal |
| Max Generation Tokens | 16.4k | 64k | Gemini 3.8 Pro |
| Tokenizer Family | Google Gemini SentencePiece (256k vocabulary) | Google Gemini SentencePiece (256k vocabulary) | — |
| Workload (per month) | Gemini 3.8 Flash | Gemini 3.8 Pro |
|---|---|---|
| Chatbot10k requests · 500 in / 200 out | $11.25 | $56.00 |
| RAG app100k requests · 8,000 in / 1,200 out | $1,050.00 | $5,360.00 |
| Coding agent100k requests · 12,000 in / 2,000 out | $1,650.00 | $8,400.00 |
Standard rates, no caching or batch discounts. Model your own numbers below.
Opt for Gemini 3.8 Flash when your engineering requirements prioritize Google's ecosystem, specific tokenizer efficiencies (Calibrated Gemini Tokenizer (±4%)), or when your expected prompt-to-completion ratios favor its $0.75/M input rate.
Opt for Gemini 3.8 Pro when looking for Google's tooling integration, specific context window depth (1.05M tokens), or when output generation volume favors its $18/M rate.
At a typical 3:1 input-to-output token mix, Gemini 3.8 Flash is about 80% cheaper than Gemini 3.8 Pro. Gemini 3.8 Flash costs $0.75 per 1M input and $3.75 per 1M output tokens; Gemini 3.8 Pro costs $4 and $18.
Both models have a 1.05M-token context window.
Gemini 3.8 Flash: yes, cached input costs $0.075/1M. Gemini 3.8 Pro: yes, cached input costs $0.4/1M.