FLUX 3 Dev: AI Image Generator
FLUX 3 Dev — the faster, lower-cost FLUX 3 variant from Black Forest Labs, with a planned open-weight release. Coming soon on Muapi.
FLUX 3 Dev — the faster, lower-cost FLUX 3 variant from Black Forest Labs, with a planned open-weight release. Coming soon on Muapi.
About this model
FLUX 3 Dev is the faster, more affordable variant in Black Forest Labs' newly announced FLUX 3 family, positioned similarly to how FLUX.1 Dev and FLUX.2 Dev relate to their Pro counterparts. Black Forest Labs has confirmed that faster, open-weight versions of FLUX 3 will ship later in 2026, continuing the company's commitment to open access alongside its hosted API. FLUX 3 Dev trades a small amount of peak fidelity from the flagship FLUX 3 model for meaningfully lower latency and cost, making it well suited to rapid iteration, prototyping, and high-volume generation workloads where turnaround speed matters more than maximum quality.
Cost analysis
| Provider | Cost | Notes |
|---|---|---|
| muapi | TBD at launch | Coming soon — early access via Black Forest Labs, general availability pricing not yet published. |
| Fal.ai | Not available | FLUX 3 is not yet available on Fal.ai. |
| Replicate | Not available | FLUX 3 is not yet available on Replicate. |
Coming soon — early access via Black Forest Labs, general availability pricing not yet published.
FLUX 3 is not yet available on Fal.ai.
FLUX 3 is not yet available on Replicate.
* Competitor pricing is estimated based on similar model architectures and usage tiers.
Configuration schema
| Parameter | Type | Description | Default |
|---|---|---|---|
| Prompt | string | Text prompt describing the image. Supports long, richly detailed descriptions. | A hyperrealistic portrait of an astronaut standing on red Martian dunes at golden hour, dust particles catching the light, ultra-detailed suit reflections, cinematic depth of field. |
| Aspect Ratio | Enum (8 options) | Aspect ratio of the output image. | 1:1 |
| Resolution | Enum (3 options) | Target resolution of the generated image. | 2k |
Text prompt describing the image. Supports long, richly detailed descriptions.
A hyperrealistic portrait of an astronaut standing on red Martian dunes at golden hour, dust particles catching the light, ultra-detailed suit reflections, cinematic depth of field.Aspect ratio of the output image.
1:1Target resolution of the generated image.
2kDeveloper documentation
Write your prompt — FLUX 3 Dev uses the same prompting conventions as the flagship FLUX 3 model.
Choose aspect_ratio and resolution.
Submit the request once live:
curl -X POST https://api.muapi.ai/api/v1/flux-3-dev \
-H "x-api-key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"prompt": "A minimalist product shot of a ceramic mug on a wooden table, soft natural light", "aspect_ratio": "1:1", "resolution": "1k"}'
/api/v1/predictions/{id}/result until completed.Frequently asked
FLUX 3 Dev is the faster, lower-cost variant of Black Forest Labs' FLUX 3 frontier model, expected to also receive an open-weight release later in 2026.
FLUX 3 Dev trades a small amount of peak image fidelity for significantly reduced latency and cost, following the same pattern as FLUX.1 Dev and FLUX.2 Dev relative to their Pro counterparts.
Black Forest Labs has announced plans to release faster, open-weight versions of FLUX 3 later in 2026, consistent with its open-access strategy for prior FLUX generations.
Not yet — Black Forest Labs is rolling out FLUX 3 in phases starting with Video and Action, followed by Image. Muapi will activate this endpoint as soon as it is publicly available.
Anyone prioritizing speed and cost over absolute peak fidelity — rapid prototyping, high-volume batch jobs, and cost-sensitive production pipelines.
Black Forest Labs has not published pricing yet. Muapi will update this page with confirmed rates as soon as they're announced, following the same pay-per-generation model as other FLUX variants.