google/nano-banana-pro/text-to-image

Text to Image

Google Nano Banana Pro (Gemini 3 Pro Image) is the top tier of the series, built for images that need sharp, legible text and careful layout. Use it for infographics, posters, menus and product shots in 1K, 2K or 4K, with optional web search for current facts and up to 4 images per call.

Try it Get API keyOpenAPI llms.txt

Prompt *

212 / 50,000

Aspect Ratio

Resolution

More settings (5)

Enable Web Search

Number of Images

Output Format

Seed

System Prompt

0 / 50,000

ResultExampleSign in to try

$0.15 / image · ~6 images per $1

Example — generated from this input

Studio product photo of a matte black mechanical wristwatch resting on a slab of dark grey slate, single soft key light from the left, crisp reflections on the sapphire crystal, shallow depth of field, 85mm lens.

Pricing

Unit price $0.15 / image

Billed by the number of images actually generated.

The price shown is for default settings; other settings can change the price and are billed at actual usage.

~6 images per $1

Each request temporarily reserves $0.15; you are charged for actual usage, usually within a minute: any unused amount is released and any usage above it is charged to your balance, even if that takes it below zero; while your balance is below zero, new requests are paused until a top-up covers it.

Failed generations are not charged.

API

Submit generation requests with this model ID.

POST/v1/model-tasks

google/nano-banana-pro/text-to-image

Request body

{
  "model": "google/nano-banana-pro/text-to-image",
  "input": {
    "prompt": "Studio product photo of a matte black mechanical wristwatch resting on a slab of dark grey slate, single soft key light from the left, crisp reflections on the sapphire crystal, shallow depth of field, 85mm lens.",
    "aspect_ratio": "1:1",
    "enable_web_search": false,
    "num_images": 1,
    "output_format": "png",
    "resolution": "1K",
    "system_prompt": ""
  }
}

Input schema

Parameter	Type	Requirement	Default
prompt	string	Required	—
aspect_ratio	string	Optional	1:1
enable_web_search	boolean	Optional	false
num_images	integer	Optional	1
output_format	string	Optional	png
resolution	string	Optional	1K
seed	integer	Optional	—
system_prompt	string	Optional

Response

The API returns a result or a pollable asynchronous task. See the examples and Schema below for the response mode and result fields.

Asynchronous task

Submit response

HTTP 202

/v1/model-tasksapplication/json

{
  "id": "task_example",
  "model": "google/nano-banana-pro/text-to-image",
  "status": "queued"
}

Status response

HTTP 200

/v1/model-tasks/{id}application/json

{
  "id": "task_example",
  "model": "google/nano-banana-pro/text-to-image",
  "status": "completed",
  "output": {
    "images": [
      {
        "url": "https://api.musespan.com/v1/model-tasks/task_example/artifacts/0"
      }
    ]
  }
}

File download

HTTP 200

/v1/model-tasks/{id}/artifacts/{index}Generated image (e.g. image/png)

When the task completes, file URLs in output point to this endpoint, numbered from 0. Send the same API key (Authorization header) when downloading.

Error response

HTTP 400

/v1/model-tasksapplication/json

{
  "error": {
    "code": "invalid_input",
    "message": "The input does not match this model's input schema. Check the model's API documentation.",
    "type": "invalid_request_error"
  }
}

Code examples

Async submission returns a task ID. Poll until status is completed, then retrieve the generated content from the result. Get your API key in the console.

# Use a new directory for each new generation. Rerunning here continues this task.
set -eu
test -s model-task-id.txt || python3 -c "import uuid; print(uuid.uuid4())" > model-task-id.txt
REQUEST_ID=$(cat model-task-id.txt)
# Idempotent: resending the same bytes with the same ID never charges twice.
curl --fail-with-body --retry 3 --retry-connrefused --request POST 'https://api.musespan.com/v1/model-tasks' \
  --header "Authorization: Bearer $MUSESPAN_API_KEY" \
  --header "X-Request-Id: $REQUEST_ID" \
  --header "Content-Type: application/json" \
  --data '{"model":"google/nano-banana-pro/text-to-image","input":{"prompt":"Studio product photo of a matte black mechanical wristwatch resting on a slab of dark grey slate, single soft key light from the left, crisp reflections on the sapphire crystal, shallow depth of field, 85mm lens.","aspect_ratio":"1:1","enable_web_search":false,"num_images":1,"output_format":"png","resolution":"1K","system_prompt":""}}'
# Poll every 5 seconds for up to 25 minutes until status is completed or failed.
# Still queued (with queue_position) 5 minutes after submission: failed with queue_timeout, not charged.
# No result 15 minutes after acceptance (or no confirmation 15 minutes after submission): failed with generation_timeout, not charged.
# Any failure is final: generate again in a new directory (a new X-Request-Id).
# A 404 means the POST did not arrive: rerun this script to resend it with the same ID.
curl --fail-with-body 'https://api.musespan.com/v1/model-tasks/'"$REQUEST_ID"'' --header "Authorization: Bearer $MUSESPAN_API_KEY"