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Gemini 3.1 Flash Lite (batch) API: toman pricing and code

google/gemini-3.1-flash-lite:batch

Image inputTool callingReasoningJSON outputFile inputAudio input
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Input · per 1M tokens
43,277 toman
Output · per 1M tokens
259,665 toman
One 1,000-word request ≈
394 toman

You are billed for the usage the request actually reported. Prices follow the market. Cached input: 4,328 toman per 1M tokens. Reasoning tokens: 259,665 toman per 1M tokens. Per input image: 0.04 toman. Web search: 4,847.07 toman per request.Pricing and top-ups

Gemini 3.1 Flash Lite (batch) example: reading an image into JSON

The example is picked from this model's own capabilities. Drop in your key and it runs as is.

# tip: a data URI works too — base64 the file and prefix it with data:image/jpeg;base64,
curl https://api.uttapen.ir/v1/chat/completions \
  -H "Authorization: Bearer sk-up-…" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "google/gemini-3.1-flash-lite:batch",
    "messages": [{
      "role": "user",
      "content": [
        {"type": "text", "text": "Return only the invoice number and the total, as JSON."},
        {"type": "image_url", "image_url": {"url": "https://example.com/factor.jpg"}}
      ]
    }]
  }'
import base64, json
from openai import OpenAI

client = OpenAI(base_url="https://api.uttapen.ir/v1", api_key="sk-up-…")

img = base64.b64encode(open("factor.jpg", "rb").read()).decode()

resp = client.chat.completions.create(
    model="google/gemini-3.1-flash-lite:batch",
    messages=[{
        "role": "user",
        "content": [
            {"type": "text", "text": "Return the invoice number, the date and the total as JSON."},
            {"type": "image_url", "image_url": {"url": f"data:image/jpeg;base64,{img}"}},
        ],
    }],
    response_format={"type": "json_object"},
)
print(json.loads(resp.choices[0].message.content))
import OpenAI from "openai";
import { readFileSync } from "node:fs";

const client = new OpenAI({ baseURL: "https://api.uttapen.ir/v1", apiKey: "sk-up-…" });
const img = readFileSync("factor.jpg").toString("base64");

const resp = await client.chat.completions.create({
  model: "google/gemini-3.1-flash-lite:batch",
  messages: [{
    role: "user",
    content: [
      { type: "text", text: "Return the invoice number, the date and the total as JSON." },
      { type: "image_url", image_url: { url: `data:image/jpeg;base64,${img}` } },
    ],
  }],
  response_format: { type: "json_object" },
});
console.log(JSON.parse(resp.choices[0].message.content));

What is Gemini 3.1 Flash Lite (batch) good for?

Google publishes this model; we expose it under the id "google/gemini-3.1-flash-lite:batch". Its context window is 1,048,576 tokens, roughly 786k English words in one request. A single response can run to 65,536 tokens. On price it sits in the "cheap" band — cheaper than 273 and dearer than 122 of the other paid models in the catalogue.

Capabilities available on this id: it reads images directly, which makes it a real option for invoices, forms and screenshots; it takes files such as PDFs as input; it accepts audio input; it supports tool calling, so it can invoke your own functions with valid arguments; it returns schema-valid JSON through response_format, ready to hand to your code; it has a reasoning mode that pays off on multi-step problems, maths and debugging. All of it works through the standard parameters of the official OpenAI SDK — no custom client, no wrapper. Keep in mind that reasoning tokens are output tokens and do appear on the bill.

For a back-of-envelope figure: about 394 toman per 1,000-word exchange (43,277 in, 259,665 out, per 1M tokens). It supports cached input: repeated context is billed at 4,328 toman per 1M, which matters a lot if your system prompt is long. Each input image is billed separately at about 0.04 toman. You are always charged for the usage the request actually reported, never for the estimate, and a failed request costs nothing.

The closest alternative with the same capabilities from a different provider is Qwen3 VL 8B Instruct: Gemini 3.1 Flash Lite (batch) works out about 9% cheaper, and its context window is larger. Both run on the same key and the same code, so trying the other one is a single string change.

To make the figure concrete: 100,000 toman of credit buys roughly 254 thousand-word requests on Gemini 3.1 Flash Lite (batch), and every 1,000 toman is about 2,538 words of round trip. A job with one million input tokens and one million output tokens comes to 302,942 toman in total. Filling this model's 1,048,576-token window costs 45,380 toman on the input side alone, which is the real reason to keep conversation history short.

This id gets confused with "google/gemini-3.1-flash-lite", because the underlying model is the same. The difference is the suffix: "batch" against the standard variant. On a thousand-word request this variant works out about 2× cheaper (394 against 788 toman).

Google has 43 models in our catalogue; the cheapest is Gemma 4 26B A4B at 67 toman per thousand words and the dearest Gemini 3.1 Pro Preview Custom Tools at 6,301. Among the less common parameters it accepts reasoning_effort — all through the standard request body. By context size the nearest option from another provider is DeepSeek V4 Flash 0423 at 1,048,576 tokens.

What to use it for: high-volume work such as classification, tagging and bulk summarising, logic puzzles and code review, pulling text and fields out of images, agents that reach out to APIs and databases, extracting data against a fixed schema, analysing a long document or codebase in one request.

Provider's own description

Gemini 3.1 Flash Lite is Google’s GA high-efficiency multimodal model optimized for low-latency, high-volume workloads. It supports text, image, video, audio, and PDF inputs, and is designed for lightweight agentic...

Three real jobs, priced on this model

Each figure is derived from the prices above and moves when they do.

JobTokensCost
One chat turn with a medium history1,500 in + 400 out169 toman
Summarising a ten-page document4,000 in + 600 out329 toman
Classifying a thousand short rows120,000 in + 20,000 out10,387 toman

Other variants of this model

Same core model, different execution terms and different price. This page is the batch variant.

VariantModel idOutput / 1MContext
standardgoogle/gemini-3.1-flash-lite519,3291,048,576

Put the variant's id verbatim in the model field; nothing else in your code changes.

Frequently asked

How do I call Gemini 3.1 Flash Lite (batch) from Iran?
Sign up with your mobile number, top the wallet up in toman, create an API key, then in the official OpenAI SDK point base_url at https://api.uttapen.ir/v1 and set model to "google/gemini-3.1-flash-lite:batch". Nothing else in your code changes.
What does Gemini 3.1 Flash Lite (batch) cost in toman?
43,277 toman per 1M input tokens and 259,665 toman per 1M output tokens; a 1,000-word request is around 394 toman. You pay for the usage that request actually reported, and a failed request costs nothing.
How much input does Gemini 3.1 Flash Lite (batch) take?
Up to 1,048,576 tokens per request, roughly 786k words. A single answer can reach 65,536 tokens.
Does Gemini 3.1 Flash Lite (batch) support streaming and tool calling?
Streaming (stream=true) works on every model here. This one supports tool calling in the standard OpenAI shape. Image input is accepted through image_url, as a data URI or a public URL. Structured output through response_format works too.