Flux 2 Flash Edit | Fast Image Editing API

WaveSpeedAI FLUX.2 Flash Edit Image-to-Image

FLUX.2 Flash Edit is a fast, cost-efficient image-to-image editing model for prompt-driven transformations. Give it one or more input images plus a clear instruction, and it will apply targeted edits while keeping the overall composition stable—great for high-throughput creative pipelines.

It’s best suited for quick style shifts, background tweaks, light retouching, and generating multiple variations for iteration or A/B testing.

Key capabilities

Ultra-fast prompt-driven editing Apply natural-language edit instructions with low latency for rapid iteration.
Composition-stable transformations Keeps layout and key identity cues stable while applying targeted changes.
Multi-image editing (up to 4 inputs) Accepts multiple input image URLs to guide the edit and/or provide references.
Production-friendly controls Deterministic results with seed, plus API-only options for synchronous responses and base64 outputs.
Size control for common creative formats Generate outputs sized for banners, posters, social crops, and product imagery.

Parameters and how to use

prompt: (required) The positive prompt describing what to change and what to preserve.
images: (required) Array of input image URLs for editing (1–4 items).
size: Output size as a string in width*height pixels (each dimension 256–1536).
seed: Random seed (-1 for random; fixed value for repeatability).
enable_base64_output: If true, returns the output as a base64 string instead of a URL (API-only).
enable_sync_mode: If true, waits for generation to finish and returns the result in the same response (API-only).

Prompt

Write prompts like an editor’s brief: what to change, what to keep, and what “done” looks like.

Tips that work well for FLUX.2 Flash Edit:

Start with the exact change: “replace the background with…”, “restyle as…”, “remove…”, “retouch…”
Explicitly preserve what matters: “keep the same face, pose, framing, and logo text.”
Keep edits scoped. If the output drifts, reduce the number of simultaneous changes and iterate in smaller steps.

Media (Images)

images must be 1–4 URLs pointing to your input images.
If your images are local files, upload them first (for example via WaveSpeedAI’s media upload endpoint) and use the returned download_url values here.
For best stability, use clear, high-quality inputs and avoid heavily compressed thumbnails.

Other parameters

size Use width*height (for example 1024*1024, 832*1216, 1216*832). Each dimension must be 256–1536.
seed
-1 (default behavior) for a new variation each run
A fixed integer (for example 12345) for repeatable results and controlled iteration
enable_sync_mode (API-only)
false (default): submit a task, then query the prediction result
true: wait and return the finished output in the same response (simpler integration, but the request takes longer)
enable_base64_output (API-only)
false (default): outputs are URLs
true: outputs are base64 strings (useful when you can’t fetch remote URLs)

After you finish configuring the parameters, click Run, preview the result, and iterate if needed.

Pricing

$0.013 per run

Notes

If you need consistency across a batch, keep size and seed fixed and vary only the prompt.
When using multiple input images, describe how they should be used (for example: “use image 1 as the base; use image 2 as style reference”).
For UI-safe outputs, keep instructions specific (avoid “make it more provocative” style prompts) and review results before publishing.

Related Models

FLUX.2 Flash Text-to-Image – The same “flash” tier optimized for fast, low-cost generation from text prompts.
FLUX.2 Dev Edit – A lightweight edit variant that’s useful when you want a different speed/cost/quality trade-off.
FLUX.2 Flex Edit – A stronger choice when you need more controlled, style-consistent edits.
FLUX 2 Max Edit – Higher-fidelity editing for detail-critical or “hero” assets.

Flux 2 Flash Edit API — Quick start

Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/wavespeed-ai/flux-2-flash/edit with your input as JSON. The endpoint returns a prediction id; poll the prediction endpoint until status flips to completed, then read the output URL from data.outputs[0]. Examples for Flux 2 Flash Edit below.

HTTP example

# Submit the prediction
curl -X POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/flux-2-flash/edit" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY" \
  -d '{
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "seed": -1,
    "enable_base64_output": false,
    "enable_sync_mode": false
}'

# Response includes a prediction id. Poll for the result:
curl -X GET "https://api.wavespeed.ai/api/v3/predictions/{request_id}/result" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY"

# When status is "completed", read the output from data.outputs[0].

Node.js example

// npm install wavespeed
const WaveSpeed = require('wavespeed');

const client = new WaveSpeed(); // reads WAVESPEED_API_KEY from env

const result = await client.run("wavespeed-ai/flux-2-flash/edit", {
        "prompt": "A cinematic shot of a city at sunset, soft golden light",
        "seed": -1,
        "enable_base64_output": false,
        "enable_sync_mode": false
});

console.log(result.outputs[0]); // → URL of the generated output

Python example

# pip install wavespeed
import wavespeed

output = wavespeed.run(
    "wavespeed-ai/flux-2-flash/edit",
    {
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "seed": -1,
    "enable_base64_output": false,
    "enable_sync_mode": false
}
)

print(output["outputs"][0])  # → URL of the generated output

Flux 2 Flash Edit API — Frequently asked questions

What is the Flux 2 Flash Edit API?

Flux 2 Flash Edit is a WaveSpeedAI model for image editing, exposed as a REST API on WaveSpeedAI. FLUX 2 flash Edit from Black Forest Labs delivers ultra-fast, production-grade image-to-image editing. Use plain-English prompts and precise HEX color control to restyle scenes, replace backgrounds, inpaint/outpaint, and retouch with brand-consistent palettes. Low-latency REST API, no cold starts, affordable pricing. You can call it programmatically or try it from the playground above.

How do I call the Flux 2 Flash Edit API?

POST your input parameters to the model's REST endpoint (shown in the API tab of this playground) with your WaveSpeedAI API key in the Authorization header. Submission returns a prediction ID; poll the prediction endpoint until status flips to "completed", then read the output URL from the result. The playground generates a ready-to-paste code sample in Python, JavaScript, or cURL for whatever inputs you've set. Full request/response shape is documented at https://wavespeed.ai/docs/docs-api/wavespeed-ai/flux-2-flash-edit.

How much does Flux 2 Flash Edit cost per run?

Flux 2 Flash Edit starts at $0.013 per run. That figure is the base price — the final charge scales with the parameters you set in the form (output size, length, count, references, or whatever knobs this model exposes), so a higher-quality or larger output costs more than a minimal one. The exact cost for your current input is shown live next to the Generate button before you submit, and the actual per-call charge is recorded on the prediction afterwards.

What inputs does Flux 2 Flash Edit accept?

Key inputs: `prompt`, `images`, `seed`, `enable_base64_output`, `enable_sync_mode`. The full JSON schema (types, defaults, allowed values) is rendered above the Generate button and mirrored in the API reference at https://wavespeed.ai/docs/docs-api/wavespeed-ai/flux-2-flash-edit.

How long does Flux 2 Flash Edit take to generate?

Average end-to-end generation time on WaveSpeedAI is around 10 seconds per request — measured across recent runs. Queue time scales with global demand; live status is visible in the prediction record.

Can I use Flux 2 Flash Edit outputs commercially?

Commercial usage rights depend on the model's license, set by its provider (WaveSpeedAI). The license summary appears on the model card above; see WaveSpeedAI's Terms of Service for platform-level conditions.

ExamplesView all

Related Models

README

WaveSpeedAI FLUX.2 Flash Edit Image-to-Image

Key capabilities

Parameters and how to use

Prompt

Media (Images)

Other parameters

Pricing

Notes

Related Models

Flux 2 Flash Edit API — Quick start

Flux 2 Flash Edit API — Frequently asked questions