Google Nano Banana 2 Text To Image API Documentation

Google Nano Banana 2 Text To Image API Documentation

Playground

Google Nano Banana 2 (Gemini 3.1 Flash Image) delivers Pro-quality image generation at Flash speed with 512px to 4K resolution support. Features include improved text rendering, character consistency for up to 5 characters, and real-world knowledge integration. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing.

Features

Nano Banana 2 Text-to-Image (Gemini 3.1 Flash Image) is Google’s lightweight yet powerful AI image generation model, built for creators who need fast, high-quality visuals from simple text prompts. It transforms words into expressive, realistic images with remarkable clarity, composition, and style diversity — all within seconds.

Why Choose This?

• Fast generation Optimized for speed while maintaining high visual quality.

• Multi-resolution support Output in 1K, 2K, or 4K resolution based on your needs.

• 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.

• Cinematic quality Excels at photorealistic scenes with atmospheric lighting and anamorphic lens effects.

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

• Format choice Export in PNG or JPEG format.

Parameters

How to Use

1. Write your prompt — describe the image in detail, including style, lighting, and composition.
2. Choose aspect ratio (optional) — select a preset or leave empty for default.
3. Select resolution — choose 1K, 2K, or 4K based on your needs.
4. Choose output format — PNG for transparency support, JPEG for smaller file size.
5. Use Prompt Enhancer (optional) — click to automatically refine your description.
6. Run — submit and download your generated image.

Pricing

Best Use Cases

• Cinematic Imagery — Generate atmospheric scenes with anamorphic lens effects and film-like quality.
• Character Portraits — Create detailed character illustrations with specific attributes.
• Social Media Content — Produce eye-catching visuals for various platforms with flexible aspect ratios.
• Marketing & Ads — Generate professional images for campaigns and promotions.
• Concept Art — Visualize creative ideas with photorealistic rendering.

Pro Tips

• Use cinematic language like “anamorphic lens look,” “neon signs reflected in puddles,” or “rainy Tokyo street at night” for atmospheric results.
• Be specific about character attributes (hair color, clothing, accessories) for consistent results.
• Match aspect ratio to your target platform: 9:16 for Stories/Reels, 16:9 for banners, 1:1 for feeds.
• Try the Prompt Enhancer to automatically improve your descriptions.
• 2K outputs are charged at 1.5× the standard rate; 4K at 2× the standard rate.

Notes

• Prompt is the only required field.
• If aspect_ratio is not selected, the model uses a default ratio.
• 2K resolution costs 1.5× and 4K resolution costs 2× the standard rate.
• Ensure your prompts comply with Google’s Safety Guidelines.

Related Models

• Nano Banana Pro Text-to-Image — Pro tier with enhanced quality.
• Nano Banana Pro Edit — Edit images with text instructions.
• Nano Banana 2 Edit — Image editing capabilities.

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",
  "aspect_ratio": "1:1",
  "resolution": "1k",
  "enable_web_search": false,
  "enable_image_search": false,
  "output_format": "png"
}
JSON
)

# 1. Submit the prediction.
SUBMIT_RESPONSE=$(curl --silent --show-error --fail-with-body \
  -X POST "https://api.wavespeed.ai/api/v3/google/nano-banana-2/text-to-image" \
  -H "Authorization: Bearer ${WAVESPEED_API_KEY}" \
  -H "Content-Type: application/json" \
  -d "${REQUEST_BODY}")

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 "${PREDICTION_ID}" ]; then
  printf 'Submission response did not contain a prediction id
' >&2
  exit 1
fi
RESULT_URL="https://api.wavespeed.ai/api/v3/predictions/${PREDICTION_ID}/result"

# 2. Poll until the prediction finishes.
while true; do
  RESPONSE=$(curl --silent --show-error --fail-with-body \
    "${RESULT_URL}" \
    -H "Authorization: Bearer ${WAVESPEED_API_KEY}")
  RESULT=$(printf '%s' "${RESPONSE}" | jq 'if type == "object" and has("data") then .data else . end')
  STATUS=$(printf '%s' "${RESULT}" | jq -r '.status // empty')

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

Parameters

Task Submission Parameters

Request Parameters

Response Parameters

Result Request Parameters

Result Response Parameters