Google Nano Banana 2 Edit Fast API Documentation

Google Nano Banana 2 Edit Fast API Documentation

Playground

Google Nano Banana 2 Edit Fast (Gemini 3.1 Flash Image) is the cheapest Nano Banana 2 editing option, starting at just $0.045 per image. Enables fast image editing with 2K default output and 4K support. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing.

Features

Nano Banana 2 Edit Fast (Gemini 3.1 Flash Image) is the cheapest Nano Banana 2 editing option, starting at just $0.045 per image. It delivers faster generation times while maintaining high visual quality, with 2K resolution by default.

Why Choose This?

• Lowest cost Nano Banana 2 The cheapest Nano Banana 2 editing option at just $0.045 per image.

• Speed-optimized Faster generation times compared to the standard variant.

• Natural language editing Modify images using simple text instructions — the model understands context and relationships.

• Multi-image reference Upload up to 14 reference images for complex edits and compositions.

• High-resolution output 2K default with 4K available for maximum detail.

• Flexible aspect ratios Multiple options including 1:1, 3:2, 2:3, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9, 1:4, 4:1, 1:8, and 8:1.

• Prompt Enhancer Built-in tool to automatically improve your edit descriptions.

• Format choice Export in PNG or JPEG format.

Parameters

How to Use

1. Upload reference images — add the images you want to edit (up to 14 images).
2. Write your prompt — describe the edit clearly (e.g., “Change the man to a woman”).
3. Choose aspect ratio (optional) — select a preset or leave empty for default.
4. Select resolution — choose 2K (default) or 4K based on your needs.
5. Choose output format — PNG for transparency support, JPEG for smaller file size.
6. Use Prompt Enhancer (optional) — click to automatically refine your description.
7. Run — submit and download your edited image.

Pricing

Best Use Cases

• Character Modification — Change attributes like gender, age, clothing, or appearance.
• Object Replacement — Swap elements within images while preserving context.
• Style Transfer — Apply different visual styles to existing images.
• Text Editing — Modify on-image text while maintaining design consistency.
• Scene Adjustment — Change backgrounds, lighting, or environmental elements.

Pro Tips

• Use clear, specific edit instructions for best results (e.g., “Change the man to a woman” rather than “modify the person”).
• Start with fewer reference images (1–3) for simpler edits.
• More reference images can help with complex compositions but may affect stability.
• Try the Prompt Enhancer to automatically improve your descriptions.

Notes

• Both images and prompt are required fields.
• Maximum reference images: 14 (recommended: fewer images for better stability).
• If aspect_ratio is not selected, the model uses a default ratio.
• Ensure your prompts comply with Google’s Safety Guidelines.

Related Models

• Nano Banana 2 Edit — Standard variant with 0.5K/1K/2K/4K resolution options.
• Nano Banana 2 Text-to-Image Fast — Fast text-to-image generation.
• Nano Banana 2 Text-to-Image — Generate images from text prompts.
• Nano Banana Pro Edit — Pro tier editing with enhanced quality.

Authentication

For authentication details, please refer to the Authentication Guide.

API Endpoints

Submit Task & Query Result

set -euo pipefail

export WAVESPEED_API_KEY="your-api-key"

REQUEST_BODY=$(cat <<'JSON'
{
  "prompt": "A cinematic ocean wave at sunrise, highly detailed",
  "images": [
    "https://interactive-examples.mdn.mozilla.net/media/cc0-images/painted-hand-298-332.jpg"
  ],
  "aspect_ratio": "1:1",
  "resolution": "2k",
  "enable_web_search": false,
  "output_format": "png"
}
JSON
)

# 1. Submit the prediction once. Never retry this request automatically:
# a retry after an unclear failure can create a second, billed task.
CHECK='The task may already exist. Check History or the predictions list before submitting again.'
if ! SUBMIT_RESPONSE=$(curl --silent --show-error --fail-with-body \
  --connect-timeout 10 --max-time 60 \
  -X POST "https://api.wavespeed.ai/api/v3/google/nano-banana-2/edit-fast" \
  -H "Authorization: Bearer ${WAVESPEED_API_KEY}" \
  -H "Content-Type: application/json" \
  -d "${REQUEST_BODY}"); then
  printf 'Submit failed. %s\n' "${CHECK}" >&2
  exit 1
fi

TASK=$(printf '%s' "${SUBMIT_RESPONSE}" | jq 'if type == "object" and has("data") then .data else . end')
PREDICTION_ID=$(printf '%s' "${TASK}" | jq -r '.id // empty')
if [ -z "${PREDICTION_ID}" ]; then
  printf 'Submission response did not contain a prediction id. %s\n' "${CHECK}" >&2
  exit 1
fi
RESULT_URL="https://api.wavespeed.ai/api/v3/predictions/${PREDICTION_ID}/result"

# 2. Poll until the prediction reaches a final status.
BODY_FILE=$(mktemp)
trap 'rm -f "${BODY_FILE}"' EXIT
while true; do
  # Transient errors (429, 5xx) are retried, honoring Retry-After.
  HTTP_CODE=$(curl --silent --show-error --fail-with-body \
    --connect-timeout 10 --max-time 60 --retry 5 --retry-delay 2 \
    --output "${BODY_FILE}" --write-out '%{http_code}' \
    "${RESULT_URL}" \
    -H "Authorization: Bearer ${WAVESPEED_API_KEY}" || true)
  case "${HTTP_CODE}" in
    2??) ;;
    000|429|5??)  # dropped connection or temporary error: keep polling
      printf 'Task %s: HTTP %s, polling again in 10s\n' "${PREDICTION_ID}" "${HTTP_CODE}" >&2
      sleep 10; continue ;;
    *) printf 'Task %s: HTTP %s\n' "${PREDICTION_ID}" "${HTTP_CODE}" >&2
      cat "${BODY_FILE}" >&2; exit 1 ;;
  esac
  RESULT=$(jq 'if type == "object" and has("data") then .data else . end' "${BODY_FILE}")
  STATUS=$(printf '%s' "${RESULT}" | jq -r '.status // empty')

  case "${STATUS}" in
    completed) printf '%s\n' "${RESULT}" | jq '.outputs'; break ;;
    failed|cancelled|timeout|deleted)
      printf 'Task %s ended with status %s\n' "${PREDICTION_ID}" "${STATUS}" >&2
      printf '%s\n' "${RESULT}" | jq . >&2; exit 1 ;;
    *) sleep 2 ;;
  esac
done

Parameters

Task Submission Parameters

Request Parameters

Every model also accepts the global request options enable_sync_mode and enable_base64_output; see their pages for details.

Response Parameters

Result Request Parameters

Result Response Parameters