Choose Google: Gemini 3.8 Flash (batch) if…
- you want the newer model — released 2026-09-02, 34 months after the other
Google: Gemini 3.8 Flash (batch) vs Auto Router
Neither wins outright: Google: Gemini 3.8 Flash (batch) is the pick when you want the newer model, Auto Router when cost matters at scale.
Key numbers
| Spec | Google: Gemini 3.8 Flash (batch) | Auto Router |
|---|---|---|
| Provider | Openrouter | |
| Input price (per 1M tokens) | $0.38 | $-1000000.0000 |
| Output price (per 1M tokens) | $1.88 | $-1000000.0000 |
| Blended price (3:1 input/output) | $0.75 | $-1000000.0000 |
| Cheaper than … of all models we track | 45% | 99% |
| Context window | 1.0M tokens (~1,573 pages) | 2M tokens (~3,000 pages) |
| Larger context than … of all models | 80% | 99% |
| Max output per response | 66K tokens (~49,200 words) | n/a |
| Input types | text, image, video, file, audio | text, image, audio, file, video |
| Output types | text | text, image |
| Free variant | No | No |
| Listed since | 2026-09-02 | 2023-11-08 |
Advertisement
What it costs for real workloads
Monthly cost at list price for five common workloads. Token counts per unit are stated so you can scale them to your own traffic. A workload that does not fit a model's context window is marked rather than priced.
| Workload (per month) | Google: Gemini 3.8 Flash (batch) | Auto Router | Difference |
|---|---|---|---|
| Customer-support chatbot 50,000 conversations — each a 6-turn conversation (1,500 in / 400 out tokens) | $65.63 | $-95000000.0000 | Auto Router saves $95,000,066 |
| RAG search over documents 20,000 questions — each a question answered from ~8 retrieved passages (6,000 in / 500 out tokens) | $63.75 | $-130000000.0000 | Auto Router saves $130,000,064 |
| Coding / tool-using agent 2,000 tasks — each a multi-step task with tool calls and file context (60,000 in / 6,000 out tokens) | $67.50 | $-132000000.0000 | Auto Router saves $132,000,068 |
| Batch summarisation 10,000 documents — each a 6,000-word report summarised to a page (8,000 in / 600 out tokens) | $41.25 | $-86000000.0000 | Auto Router saves $86,000,041 |
| Long-document analysis 500 documents — each a 150-page contract or codebase read in one pass (100,000 in / 2,000 out tokens) | $20.63 | $-51000000.0000 | Auto Router saves $51,000,021 |
Capabilities side by side
| Capability | Google: Gemini 3.8 Flash (batch) | Auto Router | What it lets you do |
|---|---|---|---|
| Tool / function calling | ✓ Yes | ✓ Yes | call your APIs and run agent loops |
| Structured output (JSON schema) | ✓ Yes | ✓ Yes | return JSON that validates against your schema |
| Reasoning / thinking mode | ✓ Yes | ✓ Yes | spend extra tokens thinking before answering hard problems |
| Image input | ✓ Yes | ✓ Yes | read screenshots, charts and scanned pages |
| Audio input | ✓ Yes | ✓ Yes | take speech or audio directly |
| File / PDF input | ✓ Yes | ✓ Yes | accept documents without your own parsing step |
| Image output | — | ✓ Yes | generate images, not just text |
| Built-in web search | ✓ Yes | ✓ Yes | answer from live web results |
| Seed (reproducible sampling) | ✓ Yes | ✓ Yes | repeat a generation for tests and evals |
| Log-probabilities | — | ✓ Yes | read token confidence for classification and scoring |
From each model's published parameters and input/output types. “—” means not advertised, not proven absent.
Price history
- Google: Gemini 3.8 Flash (batch): price unchanged since we started tracking it on 2026-09-03.
- Auto Router: price unchanged since we started tracking it on 2026-03-10.
Which should you choose?
Choose Auto Router if…
- cost matters at scale — it is 133333433% cheaper on a typical 3:1 input/output mix ($-95000000.0000 vs $65.63 a month for 50,000 support chats)
- you need to fit long inputs in one request — 2M tokens is roughly 3,000 pages, against 1,573
- you need image output — to generate images, not just text; Google: Gemini 3.8 Flash (batch) does not advertise it
- you need log-probabilities — to read token confidence for classification and scoring; Google: Gemini 3.8 Flash (batch) does not advertise it
Frequently asked questions
Is Google: Gemini 3.8 Flash (batch) better than Auto Router?
Neither wins outright: Google: Gemini 3.8 Flash (batch) is the pick when you want the newer model, Auto Router when cost matters at scale. In short: Google: Gemini 3.8 Flash (batch) when you want the newer model; Auto Router when cost matters at scale, you need to fit long inputs in one request, you need image output, you need log-probabilities.
Which is cheaper, Google: Gemini 3.8 Flash (batch) or Auto Router?
Auto Router is cheaper: $-1000000.0000 vs $0.75 per 1M tokens at a typical 3:1 input/output mix, 133333433% less. For 50,000 support conversations a month that is $-95000000.0000 against $65.63.
How much do Google: Gemini 3.8 Flash (batch) and Auto Router cost per million tokens?
Google: Gemini 3.8 Flash (batch) costs $0.38 per 1M input tokens and $1.88 per 1M output tokens; Auto Router costs $-1000000.0000 input and $-1000000.0000 output. Output tokens are billed separately, so long answers shift the gap.
Which has the bigger context window, Google: Gemini 3.8 Flash (batch) or Auto Router?
Auto Router: 2M tokens, about 3,000 pages, against 1.0M (about 1,573 pages) for Google: Gemini 3.8 Flash (batch).
Do Google: Gemini 3.8 Flash (batch) and Auto Router support function calling and JSON output?
Tool calling — Google: Gemini 3.8 Flash (batch): yes, Auto Router: yes. JSON-schema structured output — Google: Gemini 3.8 Flash (batch): yes, Auto Router: yes.
Can Google: Gemini 3.8 Flash (batch) or Auto Router read images?
Yes, both accept image input.
Is Google: Gemini 3.8 Flash (batch) or Auto Router free to use?
No free variant is listed for either; both are pay-per-token.
When were Google: Gemini 3.8 Flash (batch) and Auto Router released?
Google: Gemini 3.8 Flash (batch) was listed on 2026-09-02; Auto Router on 2023-11-08.
About the two models
Google: Gemini 3.8 Flash (batch)
Gemini 3.8 Flash is Google's most intelligent Flash model with significant gains from 3.7 Flash across software engineering, agentic tasks, and multi-step reasoning.
Full Google: Gemini 3.8 Flash (batch) specs →Auto Router
The Auto Router automatically selects the best model for your prompt, powered by the wisdom of the market. It routes you based on what the OpenRouter community collectively spends on...
Full Auto Router specs →