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AI image model
Black Forest Labs
FLUX

Flux 2 Flex

Flux 2 Flex supports prompt-only generation and editing with up to eight images on Kyeo. A request without images uses Flux 2 Flex; an upload switches it to Flux 2 Flex. Seven fixed aspect ratios and 1K or 2K output are available for 14 or 24 credits per request.

Capabilities
Generation, editing
Credit cost
14–24 credits per request
Prompt limit
3–5,000 characters
Upload limit
Up to 8 images
30-second overview
  • Requests without images use Flux 2 Flex; uploads switch to Flux 2 Flex.
  • Both modes expose seven fixed aspect ratios and `1K / 2K` on Kyeo. Content check: Default: off.
  • Editing accepts up to eight JPG, PNG, or WebP files, with a 10 MB limit per image.
  • Kyeo currently charges `1K=14` credits and `2K=24` credits per request.

Popular searches: how to generate an image with Flux 2 Flex on Kyeo · which workflow does Flux 2 Flex use after an image upload · what aspect ratios does Flux 2 Flex support

At a glance

What is this model like?

This page describes the Flux 2 Flex controls Kyeo actually provides, not the entire BFL direct API. BFL associates Flex with adjustable steps and guidance, typography, and small-detail preservation, while Kyeo currently exposes only aspect ratio and resolution. Vendor positioning, model names, and higher credits are hypotheses to test—not proof of better output.

What it does best
Prompt-only generation and image editing share seven fixed aspect ratios, 1K or 2K output, and the same resolution-based credit schedule. The Flex name does not establish an output tier.
Best for
Consider it when you want to evaluate the FLUX.2 [flex] workflow, including the vendor's typography and fine-detail positioning, and can budget 14 or 24 credits. Compare identical inputs before deciding whether it fits the job.
Why use it on Kyeo AI
Kyeo puts workflow switching, image limits, ratios, resolution, and credits in one form. You can verify the actual request boundary before spending credits or comparing it with another model.

Key facts

Quickly assess whether this model fits your use case.

Category
AI image model
Vendor
Black Forest Labs
Model family
FLUX
Runtime
Asynchronous task
Prompt limit
3–5,000 characters
Upload limit
Up to 8 images

Also known as

The same model may appear under different names across documentation and community discussions; this list keeps them easy to search and compare.

Flux 2 Flex
FLUX.2 [flex]

Common questions

These practical questions focus on the task, input conditions, and result requirements you should confirm before choosing.

how to generate an image with Flux 2 Flex on Kyeo
which workflow does Flux 2 Flex use after an image upload
what aspect ratios does Flux 2 Flex support
how many credits do Flux 2 Flex 1K and 2K cost
how many images can I upload to Flux 2 Flex
does Kyeo expose Flex steps and guidance
how do the Flux 2 Flex and Pro forms differ
does Flux 2 Flex offer automatic aspect ratio
Flux 2 Flex image format and file size limits
Which Flux 2 Flex controls are available on Kyeo

Selection guide

Use these decision points when choosing a model.

1
First confirm whether you need the Flex workflow

Flex belongs on the shortlist if you want to test BFL's typography and detail positioning. Kyeo does not expose steps or guidance, so do not expect the direct-service parameter workflow.

2
Price the request before submitting it

A 1K request costs 14 credits and a 2K request costs 24.

3
Compare with a controlled input

Keep the prompt, images, ratio, and resolution fixed when comparing Flex with Pro or GPT Image 2. Score text, subjects, color, composition, and errors separately; name and price are not quality evidence.

Popular comparisons

Compare common alternatives on the same task to clarify differences in inputs, controls, and cost.

How much more does Flux 2 Flex cost than Flux 2 Pro on Kyeo?
Do Flex and Pro expose the same aspect ratios and resolutions?
Does GPT Image 2 accept more input images than Flux 2 Flex?
Which 4K option does GPT Image 2 have that Flex does not?
How should I test Flux 2 Flex against Nano Banana 2 with identical inputs?
Which hidden parameter limits should I check before choosing Flux 2 Flex?

Model comparison

Compare the current model with alternatives at a glance.

Kyeo workflow
Flux 2 Flex
Flex generation and editing
Flux 2 Pro
Pro generation and editing
GPT Image 2
GPT Image 2 generation and editing
Image input limit
Flux 2 Flex
Up to 8 images
Flux 2 Pro
Up to 8 images
GPT Image 2
Up to 16 images
Visible controls
Flux 2 Flex
7 ratios and 1K or 2K
Flux 2 Pro
7 ratios and 1K or 2K
GPT Image 2
6 ratios and 1K, 2K, or 4K
Kyeo credits
Flux 2 Flex
1K 14 / 2K 24
Flux 2 Pro
1K 5 / 2K 7
GPT Image 2
1K 3 / 2K 5 / 4K 8
Controls not currently available
Flux 2 Flex
Inference steps, guidance strength, and a safety-check toggle
Flux 2 Pro
No safety-check toggle is shown
GPT Image 2
Only ratio and resolution are shown

Practical usage insights

Practical guidance based on public sources, current on-site limits, and representative tasks.

Direct-API positioning is not a Kyeo control

BFL describes direct Flex with adjustable steps and guidance and highlights typography and small details. Those controls are absent from Kyeo. They can inform a test plan, but they must not be presented as product features here.

The same form does not mean the same output

Flex and Pro both expose seven ratios, 1K or 2K, and up to eight images on Kyeo, while their workflow and credits differ. The same form proves neither equivalence nor a quality advantage for the more expensive option.

Capabilities

Prompt-only generation

Without an upload, Kyeo sends the prompt, fixed aspect ratio, and resolution to Flux 2 Flex. After trimming, prompts must contain 3–5,000 characters.

Editing with multiple images

Uploading one to eight images switches the workflow to Flux 2 Flex, with files passed through reference images. The multi-image limit does not guarantee consistent subjects, text, or style.

A deliberately limited control surface

Content check: Default: off. Kyeo currently charges by resolution: 14 credits for 1K and 24 credits for 2K. The same prices apply to text generation and image editing.

Use cases

Candidate tests for text-heavy artwork

Try it for poster headings, packaging copy, or interface elements, then verify every word, placement, and factual statement. Do not adopt accuracy claims from vendor examples without checking.

Compositions built from several images

Assign source images to a subject, background, or material in the prompt. Review the result for swapped roles, omissions, and changes that were never requested.

Controlled model samples

Run the same input through Flux 2 Pro, GPT Image 2, or Nano Banana 2, then choose the next step from observed errors and credit cost rather than a preset model hierarchy.

Prompt tips

Lead with the subject and required action

Put the subject, action, and any text, colors, or composition that must be preserved at the start of the prompt, then add the scene, lighting, and other details. For image editing, also explain the purpose of each reference image.

Give every input image a job

For multi-image editing, explicitly assign roles such as “the subject from image 1” and “the background from image 2.”

Treat resolution as a setting, not approval

The current jump to `2K=24` credits is substantial. If the direction is uncertain, test at 1K first to reduce wasted spend.

Why choose it

One page covers prompt-only generation and editing, with workflow determined by image uploads.
Seven fixed aspect ratios and two resolution choices make the request and credit schedule explicit.
The editing workflow accepts up to eight images for multi-source inputs.
Its visible controls match Flux 2 Pro closely enough for a controlled same-input comparison.

What to know first

A request costs 14 or 24 Kyeo credits, more than the current Flux 2 Pro and GPT Image 2 options.
Kyeo currently offers neither inference-step or guidance-strength tuning nor a manual safety-check toggle.
If the task is not complex, Flex's added cost may not provide enough benefit.
It may not be the first choice for highly stylized or burst-of-creativity work.

Adjustable parameters

Quickly assess whether this model fits your use case.

Aspect ratio
aspect_ratio
Optional
Parameter type: Dropdown
Default: 1:1
1:1
4:3
3:4
16:9
9:16
3:2
2:3
7 options
Resolution
resolution
Optional
Parameter type: Dropdown
Default: 1K
1K
2K
Content check
nsfw_checker
Optional
Parameter type: Toggle
Default: off
Off
On

Credit usage

14–24 credits per request

Kyeo currently charges by resolution: 14 credits for 1K and 24 credits for 2K. The same prices apply to text generation and image editing.

Budget tip

Before batch generation, run an A/B test with the same assets across the current model and alternatives to validate quality and avoid wasting credits.

FAQ

Related models

Compare these similar candidates before deciding.

Flux 2 Pro

Flux 2 Pro / Capabilities — Flux 2 Pro — Text-to-image and editing use the same resolution pricing: 5 credits for 1K or 7 credits for 2K. 3–5,000 characters; Up to 8 images.

AI image model
5–7 credits per request

GPT Image 2

GPT Image 2 / Capabilities — GPT Image 2 supports text-to-image generation and reference-image editing on Kyeo AI. Kyeo charges by output resolution: 1K costs 3 credits, 2K costs 5, and 4K costs 8.

AI image generation and editing model
3–8 credits per request

Nano Banana 2

Kyeo AI offers text-to-image generation and reference-guided editing with Nano Banana 2. You can upload up to 14 reference images, choose from 15 aspect ratios, and output at 1K, 2K, or 4K. Those tiers currently cost 5, 8, and 12 credits, prompts allow 20,000 characters, and the current generation form does not offer web search.

AI image generator and editor
5–12 credits per request

Sources

Content is based on model documentation, feature references, and the settings available on Kyeo AI.

Source note

Learn how Flux 2 Flex handles generation and editing on Kyeo AI, with seven aspect ratios, 1K/2K, up to eight images, 14/24 credits, and unavailable published controls. Kyeo currently charges by resolution: 14 credits for 1K and 24 credits for 2K. The same prices apply to text generation and image editing.

Last updated: 2026-08-26
Black Forest Labs: FLUX.2 Overview
Official
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Black Forest Labs: FLUX.2 Image Editing
Official
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