Flux Dev Text-to-Image
The standard Flux Dev text-to-image graph with prompt, width and height inputs. A clean starting point for Flux prompting or for deploying Flux as an API.
- A100
- Text to image
- Free template
How it works
This is the official Flux Dev example turned into a deployable workflow. A CheckpointLoaderSimple loads flux1-dev-fp8.safetensors, which bundles the model, text encoders and VAE in one file.
The prompt arrives through a text input and goes to a CLIPTextEncode node. A FluxGuidance node adds the guidance value that Flux uses in place of classic CFG. A second CLIPTextEncode holds an empty negative prompt that the sampler requires but Flux ignores.
Width and height inputs feed an EmptySD3LatentImage node, which sets the canvas. A KSampler denoises the latent, VAEDecode converts it to pixels and SaveImage stores the result. The graph has 13 nodes and needs no custom node packages.
Tips
- Leave CFG at 1.0 in the KSampler. Use the FluxGuidance value to control how closely the image follows your prompt.
- Flux responds well to long, descriptive prompts that name the subject, setting, lighting and style.
- Common sizes such as 1024x1024 work well. Keep both sides divisible by 16.
- Change the seed in the KSampler to get new variations of the same prompt.
Run it as an API
The prompt and size are exposed as inputs, so this graph can be deployed on ComfyDeploy as a Flux endpoint.
What you can use it for
- General text-to-image generation with Flux
- Illustration and concept art from detailed prompts
- A base graph to extend with LoRAs or upscalers
- Serving Flux Dev behind your own API
Run it in three steps
Open the template
Click Run on ComfyDeploy. The workflow, its custom nodes and models are set up for you on a cloud machine.
Add your inputs
Provide text prompt and image width in the playground or the ComfyUI editor.
Run, share or deploy
Run it on an A100, share it with your team as a playground, or deploy it as an API endpoint.
Frequently asked questions
What GPU does this Flux Dev workflow need?
It is configured for an A100 on ComfyDeploy and uses the fp8 checkpoint flux1-dev-fp8.safetensors.
Does Flux Dev support negative prompts?
No. The workflow note says Flux dev has no negative prompt, so CFG stays at 1.0 and the negative input is ignored.
How do I run Flux Dev as an API?
Deploy the workflow on ComfyDeploy and call it with prompt, width and height. The response is the generated image.
