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Gemini 3.5 Flash API pricing
Gemini 3.5 Flash is a model from Google Gemini with a 1,000,000-token context window. Rates below are per 1,000,000 tokens, verified October 2026.
Price list
| Token class | Rate / 1M | Notes |
|---|---|---|
| Input | $1.50 | Prompt tokens not served from cache |
| Cached input | $0.15 | 90% below base input |
| Cache write | — | Not billed per token |
| Output | $9 | 6.0× the input rate |
| Batch API | −50% | Input and output, results within 24 h |
GA May 2026.
What Gemini 3.5 Flash costs at three real workloads
Sticker prices rarely match the invoice. These three workloads use the rates above, with cache writes charged once per job and the batch discount applied only where the provider offers it.
| Workload | Requests | Tokens | Estimated cost |
|---|---|---|---|
| Support chat | 1,000 | 4K in / 600 out | $11.40 |
| RAG with caching | 1,000 | 50K in (45K cached) / 1K out | $23.31 |
| Nightly batch job | 10,000 | 10K in / 2K out | $165 |
Caching the 45K-token prefix saves about 72% on the RAG workload versus sending it uncached every call ($84 → $23.31). Batch mode halves the nightly job.
Where Gemini 3.5 Flash sits in the market
Out of 28 models in this dataset, Gemini 3.5 Flash ranks #13 cheapest by input rate, #14 by output rate, and #13 on a blended 1M-input-plus-250K-output workload.
| Model | Provider | Input | Output | Blended |
|---|---|---|---|---|
| Gemini 3.5 Flash | Google Gemini | $1.50 | $9 | $3.75 |
| Grok 4.6 | xAI Grok | $2 | $6 | $3.50 |
| Gemini 2.5 Pro | Google Gemini | $1.25 | $10 | $3.75 |
| DeepSeek V4 Pro | DeepSeek | $1.32 | $3.96 | $2.31 |
Blended cost = 1M input tokens + 250K output tokens at list price.
FAQ
How much does Gemini 3.5 Flash cost per 1M tokens?
$1.50 per 1M input tokens and $9 per 1M output tokens on the standard tier.
Is prompt caching cheaper on Gemini 3.5 Flash?
Yes. Cached input bills at $0.15 per 1M tokens, 90.0% below the $1.50 base input rate, with no separate cache-write rate published.
Does Gemini 3.5 Flash support the Batch API?
Yes. Batch requests bill at roughly half the standard input and output rates: the nightly job above costs $330 at list price and about $165 in batch mode.