Gemini 3.1 Flash Image API

Price

Billed per generated image from your prepaid balance. Prices come from the gateway’s live price list and refresh every five minutes.

What it is good for

• Assets that need a specific output resolution
• Images with text or typography inside them
• Cost control: pick the smallest tier that works

Where to be careful

• 4K is roughly 3× the 0.5K price
• Verify text rendering on your own prompts before shipping

Prompt examples

• A minimalist poster for a coffee brand, cream background, bold black serif headline, lots of negative space
• A clean product label mockup on a white bottle, soft studio light, readable small text
• A wide banner illustrating an AI gateway, abstract nodes and lines, blue and orange accents

Call it from the command line

curl https://api.tokwork.com/v1/images/generations \
  -H "Authorization: Bearer $TOKWORK_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gemini-3.1-flash-image",
    "prompt": "your prompt here",
    "size": "1024x1024"
  }'

Or with the OpenAI SDK

import OpenAI from 'openai'

const client = new OpenAI({
  apiKey: process.env.TOKWORK_API_KEY,
  baseURL: 'https://api.tokwork.com/v1',
})

const image = await client.images.generate({
  model: 'gemini-3.1-flash-image',
  prompt: 'your prompt here',
  size: '1024x1024',
})

Questions