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 is the faster, lower-cost variant of Black Forest Labs' FLUX 3 frontier model, planned for open-weight release. It trades a small amount of peak fidelity for significantly reduced latency and price, making it well suited for rapid iteration, prototyping, and high-volume text-to-image generation.

Interactive model controls

FLUX 3 Dev is the faster, lower-cost variant of Black Forest Labs' FLUX 3 frontier model, planned for open-weight release. It trades a small amount of peak fidelity for significantly reduced latency and price, making it well suited for rapid iteration, prototyping, and high-volume text-to-image generation.

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Overview

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.

1Rapid Prototyping: Iterate on visual concepts quickly before committing to a final render.

2High-Volume Generation: Batch-generate large numbers of images at lower per-image cost.

3Research & Fine-Tuning: Build on an open-weight model once released for custom applications.

4Draft Review: Preview compositions and styles before running the flagship FLUX 3 model.

5Cost-Sensitive Pipelines: Power features where budget matters more than absolute peak quality.

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Pricing & Value

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.

muapiTBD at launch

Coming soon — early access via Black Forest Labs, general availability pricing not yet published.

Fal.aiNot available

FLUX 3 is not yet available on Fal.ai.

ReplicateNot available

FLUX 3 is not yet available on Replicate.

** Competitor pricing is estimated based on similar model architectures and usage tiers.

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Technical Details

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`

Promptstring

Text prompt describing the image. Supports long, richly detailed descriptions.

Default Value

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 RatioEnum (8 options)

Aspect ratio of the output image.

Default Value1:1

ResolutionEnum (3 options)

Target resolution of the generated image.

Default Value2k

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Implementation Guide

Developer documentation

How to Use FLUX 3 Dev (Early Access)

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"}'

Poll /api/v1/predictions/{id}/result until completed.

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Common Questions

Frequently asked

What is FLUX 3 Dev?

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.

How does FLUX 3 Dev differ from the flagship FLUX 3 model?

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.

Will FLUX 3 Dev be open-weight?

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.

Is FLUX 3 Dev available now?

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.

Who should use FLUX 3 Dev instead of the full FLUX 3 model?

Anyone prioritizing speed and cost over absolute peak fidelity — rapid prototyping, high-volume batch jobs, and cost-sensitive production pipelines.

How much will FLUX 3 Dev cost per generation?

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.