Google · Model
Gemini 3.8 Flash pricing, context window and specs
Gemini 3.8 Flash costs $0.75 per million input tokens and $3.75 per million output tokens, and reads up to 1,048,576 tokens per request. By blended price it is number 15 of 20 from cheapest in Google's current line-up.
- Input / 1M
- $0.75
- Output / 1M
- $3.75
- Cached / 1M
- $0.075
- Context
- 1,048,576
- Max output
- 65,536
- Released
- 2026-09-02
Estimate your cost with Gemini 3.8 FlashCompare all Google modelsCount tokens for Gemini 3.8 Flash
Pricing
Gemini 3.8 Flash API pricing
| Price per 1M tokens | Input | Output |
|---|---|---|
| Standard | $0.75 | $3.75 |
| Cached input (read) | $0.075 | – |
| Batch API | $0.375 | $1.875 |
Output costs 5.0× the input price, so long replies drive the bill more than long prompts. If your requests share a long fixed prefix, such as a system prompt or tool definitions, caching cuts that part to 10% of the normal input price.
Examples
What Gemini 3.8 Flash costs in practice
| Workload | Tokens in / out | Requests/day | Per request | Per month |
|---|---|---|---|---|
| Support chatbot50% cached | 1,500 / 400 | 1,000 | $0.00212 | $64.45 |
| RAG app20% cached | 6,000 / 500 | 500 | $0.00557 | $84.63 |
| Coding agent80% cached | 40,000 / 2,000 | 200 | $0.0159 | $96.73 |
| Document summariserbatch | 8,000 / 600 | 300 | $0.00413 | $37.64 |
Change any number in the cost calculator.
Context
Context window
Gemini 3.8 Flash accepts up to 1,048,576 tokens per request, roughly 786,432 English words or 1,573 pages. That budget is shared between your prompt and the reply, and a single reply is capped at 65,536 tokens.
Filling the whole window with one prompt costs about $0.79 at list price, so for repeated long-document work, retrieval (sending only the relevant parts) or prompt caching is usually much cheaper.
Features
Capabilities
- Image input
- Yes
- Tool / function calling
- Yes
- Reasoning mode
- Yes
- Prompt caching
- Yes
- Structured output
- Yes
- Open weights
- No
- Accepts
- text, image, video, file, audio
- Knowledge cutoff
- Not published
As declared by the provider’s API. It shows a feature exists, not how well it works.
Where Gemini 3.8 Flash sits in Google’s line-up
Ranked by blended price (three parts input to one part output, $1.50 per 1M for Gemini 3.8 Flash), it is number 15 of 20 from cheapest of Google’s 20 priced models. See every Google model and price
| Model | Input / 1M | Output / 1M | Context | Released |
|---|---|---|---|---|
| Gemini 3.8 Flash (this page) | $0.75 | $3.75 | 1,048,576 | 2026-09-02 |
| Gemini 3.7 Flash | $0.75 | $3.75 | 1,048,576 | 2026-08-13 |
| Gemini 3.5 Flash Lite | $0.30 | $2.50 | 1,048,576 | 2026-07-21 |
| Gemini 3.6 Flash | $0.75 | $3.75 | 1,048,576 | 2026-07-21 |
| Gemini 3.5 Flash | $1.50 | $9 | 1,048,576 | 2026-05-19 |
| Gemini 3.1 Flash Lite | $0.25 | $1.50 | 1,048,576 | 2026-05-07 |
| Gemma 4 26B A4B | $0.0765 | $0.255 | 262,144 | 2026-04-03 |
| Gemma 4 31B | $0.09 | $0.34 | 262,144 | 2026-04-02 |
Save
Cheaper alternatives
- Seed-2.0-MiniByteDance Seed88% cheaper
- Claude Haiku 5.5Anthropic87% cheaper
- GPT-6 LunaOpenAI87% cheaper
- Qwen3.8 FlashQwen85% cheaper
- DeepSeek V4 Flash Vision ExpDeepSeek78% cheaper
Current models from major providers, one per provider, that keep image input, tool calling, a reasoning mode, a usable context window and output limit. Compared by blended price.
Compare
Similarly priced models
- GLM 5.1Z.ai$0.966 / $3.036
- Qwen3 Max ThinkingQwen$0.78 / $3.90
- Grok 4.20xAI$1.25 / $2.50
- Kimi K2.7 CodeMoonshot AI$0.6712 / $3.35
- GPT-5.4 MiniOpenAI$0.75 / $4.50
Current models from other major providers, closest blended price.
FAQ
Gemini 3.8 Flash questions
How much does Gemini 3.8 Flash cost?
Gemini 3.8 Flash costs $0.75 per million input tokens and $3.75 per million output tokens, with cached input at $0.075. A typical chatbot reply (1,500 tokens in, 400 out) costs about $0.00262. Use the LLM cost calculator for your own workload.
What is Gemini 3.8 Flash's context window?
1,048,576 tokens, about 786,432 English words or 1,573 printed pages, shared between your prompt and the reply. A single reply can be up to 65,536 tokens.
Does Gemini 3.8 Flash support prompt caching and batch requests?
Yes, cached input is billed at $0.075 per million tokens (10% of the normal input price). A batch API is available at $0.375 input and $1.875 output per million tokens.
What are cheaper alternatives to Gemini 3.8 Flash?
With the same essentials (image input and tool calling), the cheapest options are Seed-2.0-Mini (88% cheaper), Claude Haiku 5.5 (87% cheaper), GPT-6 Luna (87% cheaper). Cheaper doesn't mean equivalent, so test them on your own prompts.
Is Gemini 3.8 Flash open source?
No, Gemini 3.8 Flash is only available through Google's API and partners; its weights aren't published.