Flux 2 Dev Text To Image API Documentation

Flux 2 Dev Text To Image API Documentation

Playground

FLUX.2 [dev] from Black Forest Labs delivers fast, studio-quality text-to-image generation with enhanced realism, crisper text rendering, and native editing for rapid iteration. Ready-to-use REST inference API, best performance, no cold starts, affordable pricing.

Features

FLUX.2 [dev] is the lean base model of the FLUX.2 family: an open-source text-to-image engine tuned for speed, stability, and training friendliness. It delivers solid visual quality while staying small enough for rapid iteration, LoRA experiments, and large-scale batch jobs.

Built for

• Rapid prototyping and prompt exploration
• High-volume generation under tight cost constraints
• Research and custom training workflows (LoRA, adapters, etc.)
• Teams that need a dependable “default” model in their stack

What This Means for You

• Strong speed–quality ratio

Produces coherent, sharp images much faster than heavyweight models, keeping experimentation loops short and interactive.

• Transparent, open foundation

Built on open FLUX.2 tooling and community work, so you can inspect behaviour, plug it into your own code, and extend it without a black box.

• Resource-light generation

The compact dev configuration keeps GPU memory and runtime requirements modest, which is perfect for large batches, schedulers, and internal tools.

• Pipeline-friendly outputs

Generates standard JPEG or PNG images that slot directly into design workflows, web delivery, or later editing stages.

• Stable, repeatable behaviour

Seed control and predictable sampling make it easy to reproduce results or generate controlled variations for A/B testing, prompt tuning, and dataset creation.

Pricing

Simple per-image billing:

• $0.012 per generated image

FLUX.2 family on WaveSpeedAI

Combine FLUX.2 [dev] with the rest of the FLUX.2 lineup for a complete creation and editing workflow:

• FLUX.2 [dev] Edit – edit and refine existing images while staying in the same lightweight, fine-tuning-friendly family:

• FLUX.2 Flex Text-to-Image – more flexible, style-rich generation for creative exploration:

• FLUX.2 Flex Edit – powerful image editing with broader stylistic range:

• FLUX.2 Pro Text-to-Image – higher-capacity model for maximum quality hero shots and demanding production use:

• FLUX.2 Pro Edit - remium editing for detailed, high-fidelity transformations:

More Image Tools on WaveSpeedAI

• Nano Banana Pro – Google’s Gemini-based text-to-image model for sharp, coherent, prompt-faithful visuals that work great for ads, keyframes, and product shots.
• Seedream V4 – ’s style-consistent, multi-image generator ideal for posters, campaigns, and large batches of on-brand illustrations.
• Qwen Edit Plus – an enhanced Qwen-based image editor for precise inpainting, cleanup, and local style changes while preserving overall composition.

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",
  "size": "1024*1024",
  "seed": -1
}
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-2-dev/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 "${PREDICTION_ID}" ]; then
  printf 'Submission response did not contain a prediction id
' >&2
  exit 1
fi
RESULT_URL=$(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