Prices → Compare → Gemini 3.7 Flash vs Gemini 3.1 Pro
Gemini 3.7 Flash vs Gemini 3.1 Pro: API cost compared
Gemini 3.7 Flash lists at $0.750 in / $3.750 out per 1M tokens. Gemini 3.1 Pro lists at $2.000 in / $12.00. Sticker price only tells you so much — below is what each actually costs across eight production workloads.
Side by side
| Gemini 3.7 Flash | Gemini 3.1 Pro | |
|---|---|---|
| Provider | ||
| Input per 1M | $0.750 | $2.000 |
| Output per 1M | $3.750 | $12.00 |
| Cached input per 1M | not published | not published |
| Context window | 1M | 1M |
| Blended per 1M (3:1) | $1.500 | $4.500 |
Monthly cost by workload
Caching applied at each workload's typical hit rate. This is where the two models actually separate.
| Workload | Gemini 3.7 Flash | Gemini 3.1 Pro | Cheaper | Difference |
|---|---|---|---|---|
| Customer support chatbot | $133.12 | $390.00 | Gemini 3.7 Flash | $256.88 (66%) |
| RAG document Q&A | $165.00 | $464.00 | Gemini 3.7 Flash | $299.00 (64%) |
| Coding agent | $120.00 | $344.00 | Gemini 3.7 Flash | $224.00 (65%) |
| Bulk summarization | $1,050 | $2,880 | Gemini 3.7 Flash | $1,830 (64%) |
| Structured data extraction | $1,781 | $5,000 | Gemini 3.7 Flash | $3,219 (64%) |
| Long-form content generation | $165.00 | $520.00 | Gemini 3.7 Flash | $355.00 (68%) |
| Email triage agent | $487.50 | $1,360 | Gemini 3.7 Flash | $872.50 (64%) |
| Translation pipeline | $1,069 | $3,330 | Gemini 3.7 Flash | $2,261 (68%) |
How to read this
Gemini 3.7 Flash is cheaper on the majority of these workloads, but "majority" is not the decision. The output:input price ratio is 5.0 for Gemini 3.7 Flash and 6.0 for Gemini 3.1 Pro. If your traffic is output-heavy — long-form drafting, translation — the model with the lower output price wins regardless of what the input price suggests. If you are input-heavy — RAG, bulk summarization, agents re-reading a codebase — the cached input rate matters more than either headline number.
Cost is also not the only axis. This site does not benchmark quality, latency, or rate limits, and a model that is 3x cheaper but needs two attempts per task is not cheaper. Use these numbers to size a bill, then validate on your own evals.
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| Model | In /1M | Out /1M | Monthly | vs best |
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