Google: Nano Banana 2 (Gemini 3.1 Flash Image) API Pricing
Google: Nano Banana 2 (Gemini 3.1 Flash Image) costs $0.500 per 1M input tokens and $3.00 per 1M output tokens. Context window: 131K. Prices verified 2026-10-21 · source
Alternatives to consider
Cheapest google model — 96% less per month
Rebuilt daily from our snapshot archive — the chart appears once a model has 5+ snapshots of history.
From our own daily snapshot archive — independent of provider announcements.
Token economics
| Token type | Price | vs base input |
|---|---|---|
| Standard input | $0.500 | — |
| Output | $3.00 | — |
| Web search tool | $14/1k searches | — |
Prompt caching stores repeated context server-side: reads cost far less, but writes carry a one-time premium.
Higher effort = deeper thinking = more reasoning tokens billed as output.
What would Google: Nano Banana 2 (Gemini 3.1 Flash Image) cost you per month?
| Workload | Requests/mo | Avg tokens (in/out) | Est. monthly cost |
|---|---|---|---|
| Light chatbot | 10,000 | 800 / 400 | $16.00 |
| Coding agent | 5,000 | 8,000 / 2,000 | $50.00 |
| RAG pipeline | 30,000 | 4,000 / 500 | $105.00 |
| Doc summarizer | 2,000 | 20,000 / 1,000 | $26.00 |
Estimates use list prices without prompt caching. Caching can cut input cost by up to 90% on repeated context.
About Google: Nano Banana 2 (Gemini 3.1 Flash Image)
Gemini 3.1 Flash Image, a.k.a. "Nano Banana 2," is Google’s latest state of the art image generation and editing model, delivering Pro-level visual quality at Flash speed. It combines advanced...
Compare Google: Nano Banana 2 (Gemini 3.1 Flash Image) with
- Flash Image) vs OpenAI: GPT-5.6 Terra Pro
- Flash Image) vs Anthropic: Claude Fable 5
- Flash Image) vs Anthropic: Claude Opus 5
- Flash Image) vs OpenAI: GPT-5.6 Sol
Popular head-to-heads — see all on the comparisons index.
Frequently asked questions
How much does Google: Nano Banana 2 (Gemini 3.1 Flash Image) cost?
Google: Nano Banana 2 (Gemini 3.1 Flash Image) costs $0.500 per 1M input tokens and $3.00 per 1M output tokens. Verified 2026-10-21 — provider source.
What is the context window?
131K tokens, with up to 33K output tokens per response. That's roughly 164 pages of text in a single request.
Does it support prompt caching?
Prompt-caching pricing is not published for this model via OpenRouter.
What's a cheaper alternative?
ScaleDown: Summarize saves about 98% on a typical workload with comparable quality.
Official resources
- Google: Nano Banana 2 (Gemini 3.1 Flash Image) on OpenRouter — live endpoint, pricing source of record.
- Artificial Analysis leaderboard → — independent intelligence and performance rankings.
- Gemini docs → — first-party model specifications and limits.
- LMArena leaderboard → — independent human-preference rankings.
- Shred your current bill — paste a CSV and see if switching saves money.