Can I control Flux 2 Flex steps and guidance on Kyeo?

No. BFL lists both controls for its direct Flex service, but Kyeo currently exposes only aspect ratio and resolution. Technical identifiers: `nsfw_checker`.

Which Flux 2 Flex route is used after I upload images?

Uploading one to eight images selects `flux-2/flex-image-to-image`; a request without images uses `flux-2/flex-text-to-image`. Each file must be JPG, PNG, or WebP and no larger than 10 MB.

What should I check before uploading several reference images?

Upload only images you may use and modify, and state each image's role in the prompt. Before publication, commercial use, or use in important information, review rights, facts, text, color, people, and brand elements. Input count and credits guarantee none of them. Technical identifiers: `1K / 2K`, `aspect_ratio=auto`.

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-text-to-image`; an upload switches it to `flux-2/flex-image-to-image`. 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

5,000 characters

Upload limit

Up to 8 images

Requests without images use `flux-2/flex-text-to-image`; uploads switch to `flux-2/flex-image-to-image`.

Both modes expose seven fixed aspect ratios and `1K / 2K` on Kyeo.

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.

Try this model for free View credit pricing Back to model gallery

30-second overview

FLUX

14–24 credits per request

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] route, 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.

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

Why use it on Kyeo AI

Kyeo puts route 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 matches your workflow.

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-text-to-image

flux-2/flex-image-to-image

FLUX.2 [flex]

Common search intents

These questions and keywords combine public references with common creative use cases to help you choose faster.

how to generate an image with Flux 2 Flex on Kyeo

which route 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.

Start with the controls you can actually use

Flex belongs on the shortlist if you want to test BFL's typography and detail positioning. Kyeo does not expose steps or guidance, however.

Price the request before submitting it

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

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

Common comparison questions help you find the practical differences quickly.

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.

Dimension

Flux 2 Flex

Flux 2 Pro

GPT Image 2

Kyeo routes

Flex generation and editing

Pro generation and editing

GPT Image 2 generation and editing

Image input limit

Up to 8 images

Up to 16 images

Visible controls

7 ratios and 1K or 2K

6 ratios and 1K, 2K, or 4K

Kyeo credits

1K 14 / 2K 24

1K 5 / 2K 7

1K 3 / 2K 5 / 4K 8

Additional controls

steps, guidance, nsfw_checker

Only ratio and resolution are shown on Kyeo

Only ratio and resolution are shown

Practical usage insights

Practical observations based on real creative workflows.

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.

Flexible resolution changes both cost and workflow

Flex and Pro both expose seven ratios, 1K or 2K, and up to eight images on Kyeo, while their routes 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-text-to-image`. Prompts may contain up to 5,000 characters.

Editing with multiple images

Uploading one to eight images switches the route to `flux-2/flex-image-to-image`, with files passed through `input_urls`.

A deliberately limited control surface

Both modes show seven fixed ratios and 1K or 2K. Technical identifiers: `nsfw_checker`.

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.

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 primary subject and action first, followed by scene, lighting, composition, and must-keep details. Clear structure makes review easier.

Give every input image a job

Give FLUX a clear subject, scene, and desired result, then refine one variable at a time across a few focused samples.

Treat resolution as a setting, not approval

1K and 2K are billing options. Inspect the same criteria at either setting. Technical identifiers: `2K=24`.

Strengths

One page covers prompt-only generation and editing, with routing determined by image uploads.

Seven fixed aspect ratios and two resolution choices make the request and credit schedule explicit.

The editing route accepts up to eight images for multi-source inputs.

Its visible controls match Flux 2 Pro closely enough for a controlled same-input comparison.

Limitations

A request costs 14 or 24 Kyeo credits, more than the current Flux 2 Pro and GPT Image 2 options.

Kyeo does not expose BFL's direct Flex steps or guidance controls, or the `nsfw_checker` shown in upstream examples.

Kyeo does not expose the direct API's steps or guidance controls.

Eight reference images are an input limit, not a consistency guarantee.

Adjustable parameters

Quickly assess whether this model matches your workflow.

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

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 on Kyeo supports text-to-image and image editing. A request without an upload uses `flux-2/pro-text-to-image`; attaching one to eight images switches to `flux-2/pro-image-to-image`. Both routes offer seven fixed aspect ratios and 1K/2K, currently priced at 5/7 credits.

AI image model

5-7 credits / request

View details Use now

GPT Image 2

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

View details Use now

Nano Banana 2

Kyeo AI offers generation and reference-guided editing through `nano-banana-2`, with optional `google_search`, up to 14 `image_input` files, 15 aspect-ratio choices, and 1K, 2K, or 4K output. Those tiers currently cost 5, 8, and 12 credits, and prompts allow 20,000 characters.

AI image generator and editor

5–12 credits per request

View details Use now

Sources

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

Source notes

This page compares three layers of evidence. Black Forest Labs materials describe the vendor's positioning for FLUX.2 [flex]; the upstream interface publishes `flux-2/flex-text-to-image` and `flux-2/flex-image-to-image`; Kyeo's current configuration determines the controls, upload limits, and credits users actually see. BFL documents adjustable steps and guidance for its direct Flex service, but Kyeo exposes neither control and also omits the upstream interface's example `nsfw_checker`.

Last reviewed: 2026-07-20

Black Forest Labs: FLUX.2 Overview

Official

View source

Black Forest Labs: FLUX.2 Image Editing

Official

View source

Black Forest Labs: API Pricing

Official

View source

Upstream interface documentation: Flux-2 Flex text-to-image

Platform

Kyeo sends only the fixed aspect ratio and `1K / 2K` selected in its form. Technical identifiers: `flux-2/flex-text-to-image`.

Upstream interface documentation: Flux-2 Flex image-to-image

Platform

Kyeo passes up to eight images through `input_urls`. Technical identifiers: `flux-2/flex-image-to-image`.

Upstream interface documentation: Flux 2 pricing notes

Platform

Generation and editing use the same resolution pricing: 14 credits at 1K and 24 credits at 2K.

Kyeo AI model configuration

Platform

Kyeo configuration controls workflow switching, the 5,000-character prompt, seven ratios, 1K or 2K, eight images, upload format and size, and credits.