Nano Banana 2

GoogleImage generationper-requestTiered pricingsave 81% vs official

Nano Banana 2 (Gemini 3.1 Flash Image Preview) asynchronous image generation and editing with up to 4K output, 14 reference images, and optional Google Search enhancement.

Price

$0.013/ call

Endpoint

/images/tasks

Delivery pattern

Async task lifecycle

Availability

Available now

API documentation

Build and copy the request

Choose the options this model accepts. The code below updates as you choose.

Step-by-step in the docs

POSThttps://www.aisplice.store/v1/images/tasksBearer API keyAsync task

OptionsOnly options published for this model are shown.

sizeresolution

# Requires curl and jq
API_KEY="${API_KEY:-YOUR_API_KEY}"

# 1. Submit once
SUBMITTED=$(curl --fail-with-body -sS https://www.aisplice.store/v1/images/tasks \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: model-docs-$(date +%s)-$$" \\
  -d '{
  "model": "Nano Banana 2",
  "prompt": "A cinematic scene with careful composition",
  "size": "auto",
  "resolution": "1K",
  "n": 1
}')
TASK_ID=$(printf '%s' "$SUBMITTED" | jq -r '.task_id // .id // empty')
if [ -z "$TASK_ID" ]; then
  printf '%s\n' "$SUBMITTED" >&2
  exit 1
fi
echo "task_id=$TASK_ID"

# 2. Poll until terminal
while true; do
  STATUS_JSON=$(curl --fail-with-body -sS \
    "https://www.aisplice.store/v1/images/tasks/$TASK_ID" \
    -H "Authorization: Bearer $API_KEY")
  STATUS=$(printf '%s' "$STATUS_JSON" | jq -r '.status // empty' | tr '[:upper:]' '[:lower:]')
  echo "status=$STATUS"
  case "$STATUS" in
    completed|succeeded|success) break ;;
    failed|failure|cancelled|canceled)
      printf '%s\n' "$STATUS_JSON" | jq .
      exit 1
      ;;
  esac
  sleep 3
done

# 3. Fetch the final result
curl --fail-with-body -sS \
  "https://www.aisplice.store/v1/images/tasks/$TASK_ID/content" \
  -H "Authorization: Bearer $API_KEY" | jq .

1Submit the task
2Poll the status
3Fetch the content

Public media URLs are recommended for production. Upload a local file first, then put public_url into the model request. Avoid large Base64 bodies.

Read the upload guide

Parameter reference

model

stringrequired

Exact model identifier for this request.

gemini-3.1-flash-image-preview

prompt

stringrequired

Instruction describing the desired result.

size

stringoptional

Output aspect ratio or dimensions.

auto1:12:33:23:44:34:55:49:1616:921:91:44:11:88:1

resolution

stringoptional

Requested output resolution.

0.5K1K2K4K

n

integeroptional

images

string[]optional

Optional reference images, up to 14.

Response lifecycle

Task status, terminal states, and result response examples.

Submit

{
  "id": "task_xxx",
  "task_id": "task_xxx",
  "object": "image.task",
  "model": "Nano Banana 2",
  "status": "queued"
}

Content

{
  "created": 1720000000,
  "data": [
    {
      "url": "https://media.example/result.png"
    }
  ]
}

Waiting

queued · submitted · in_progress · processing

Success

completed · succeeded · success

Failure

failed · failure · cancelled · canceled

Errors and production

Retry rules, idempotency, and the minimum production checklist.

400 / 422

Fix the request fields or unsupported option; do not retry unchanged.

401

Check that the API key is present, active, and sent as a Bearer token.

402

The account balance is insufficient.

409

The Idempotency-Key is processing or was reused with another body.

429

Back off according to Retry-After before retrying.

5xx

Retry with exponential backoff and keep the original Idempotency-Key.

Keep API keys on your server for public mobile and browser applications.
Set a unique Idempotency-Key for every billable async operation.
Persist task_id so polling can resume after a restart.
Use a timeout for every HTTP request and surface the request ID in support reports.
Read live model metadata instead of hard-coding prices and supported options.

Price and tiers

save 81% vs official

Request price

$0.013/ call

$0.067

Tiered pricing

Base price $0.013

Tier pricing — the final price depends on the options you request. Unlisted tiers bill at the base price.

SizePrice