Flux 1.1 Pro Ultra API Documentation

Flux 1.1 Pro Ultra API Documentation

Playground

FLUX 1.1 Pro Ultra is the latest FLUX model delivering professional-grade photoreal image generation with support up to 2K resolution. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing.

Features

Generate stunning, highly detailed images with FLUX 1.1 Pro Ultra — the premium tier of Black Forest Labs’ acclaimed FLUX model family. Known for exceptional prompt adherence, intricate detail rendering, and versatile style capabilities, it’s the go-to choice for professional-quality image generation.

Why It Looks Great

• Ultra-quality output: Premium tier delivers maximum detail, coherence, and visual fidelity.
• Exceptional prompt adherence: Accurately interprets complex, multi-element descriptions.
• Raw mode: Toggle for less processed, more natural-looking images.
• Intricate detail rendering: Excels at fine textures, ornate designs, and complex machinery.
• Flexible aspect ratios: Multiple format options for any use case.
• Prompt Enhancer: Built-in tool to refine and expand your descriptions automatically.
• Reproducible results: Use the seed parameter to recreate exact outputs.

Parameters

How to Use

1. Write your prompt — describe your image with rich details about subject, style, and atmosphere.
2. Use Prompt Enhancer (optional) — click to automatically enrich your description.
3. Choose aspect ratio — select the format that fits your needs.
4. Select output format — choose jpg for smaller files or png for higher quality.
5. Toggle raw mode (optional) — enable for more natural, less processed aesthetics.
6. Set seed (optional) — for reproducible results.
7. Run — click the button to generate.
8. Download — preview and save your image.

Pricing

Flat rate per image generation.

Best Use Cases

• Concept Art & Illustration — Create detailed fantasy, sci-fi, and steampunk imagery.
• Product Visualization — Generate intricate product concepts with fine details.
• Architectural Rendering — Visualize ornate buildings and interior designs.
• Marketing & Advertising — Produce high-quality visuals for campaigns.
• Creative Exploration — Experiment with complex, multi-element compositions.

Example Prompts

• “A grand steampunk airship soaring through the sky, with intricate brass and copper details, large propellers spinning, and a massive balloon filled with hot air. The airship is adorned with Victorian-style architecture, featuring ornate railings and decorative elements.”
• “Photorealistic portrait of an elderly craftsman in his workshop, warm natural lighting, detailed wood textures and tools in background”
• “Enchanted library with floating books, magical glowing orbs, spiral staircases reaching into infinite darkness, fantasy art style”
• “Futuristic motorcycle design with sleek aerodynamic curves, chrome and matte black finish, studio lighting”
• “Japanese zen garden at dawn, morning mist over raked sand patterns, moss-covered stones, cherry blossom petals falling”

Raw Mode Explained

Pro Tips for Best Results

• FLUX excels at intricate details — don’t hesitate to describe ornate, complex elements.
• Include material descriptions: “brass and copper”, “chrome finish”, “weathered wood”.
• Specify lighting conditions for more controlled outputs.
• Use raw mode when you want images that feel more like photographs than renders.
• Layer your descriptions: subject → details → environment → style → mood.
• The model handles long, detailed prompts exceptionally well — be descriptive!

Notes

• The enable_base64_output option is only available through the API.
• Generation time may vary based on prompt complexity and queue load.
• FLUX 1.1 Pro Ultra represents the highest quality tier in the FLUX family.
• Raw mode is particularly effective for portraits and natural scenes.

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",
  "output_format": "jpg",
  "raw": false
}
JSON
)

# 1. Submit the prediction.
SUBMIT_RESPONSE=$(curl --silent --show-error --fail-with-body \
  -X POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/flux-1.1-pro-ultra" \
  -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 "${PREDICTION_ID}" ]; then
  printf 'Submission response did not contain a prediction id
' >&2
  exit 1
fi
RESULT_URL=$(printf '%s' "${TASK}" | jq -r '.urls.get // empty')
if [ -z "${RESULT_URL}" ]; then RESULT_URL="https://api.wavespeed.ai/api/v3/predictions/${PREDICTION_ID}/result"; fi

# 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) printf '%s\n' "${RESULT}" | jq . >&2; exit 1 ;;
    created|processing) sleep 2 ;;
    *) printf 'Unexpected status: %s
' "${STATUS}" >&2; exit 1 ;;
  esac
done

Parameters

Task Submission Parameters

Request Parameters

Response Parameters

Result Request Parameters

Result Response Parameters