This ComfyUI workflow generates images from text using Flux.1 Schnell (full) with a minimal, fast sampling setup. It combines DualCLIPLoader to load both CLIP-L and T5XXL text encoders, CLIPTextEncodeFlux to turn your prompts into Flux-ready conditioning, and UNETLoader to load the flux1-schnell.safetensors diffusion model. EmptySD3LatentImage defines the latent canvas size and batch, KSampler performs denoising in as few as four steps, and VAELoader + VAEDecode reconstruct the final image for SaveImage to write to disk. A ConditioningZeroOut node provides an unconditional branch for classifier-free guidance when you’re not using a negative prompt. MarkdownNote nodes in the canvas clarify what to do at each stage.
Technically, the workflow follows a standard latent diffusion path adapted for Flux/SD3-style latents: initialize an EmptySD3LatentImage, encode text with CLIPTextEncodeFlux, run the UNet through KSampler with a low step-count tuned for the Schnell variant, then decode with the selected VAE. The “Step 1 - Load Models Here” group centralizes model selection: flux1-schnell in UNETLoader, CLIP-L + T5XXL in DualCLIPLoader, and a compatible VAE in VAELoader. “Step 2 - Image Size” sets your width/height and batch, and “Step 3 - Prompt” handles positive/negative prompts. The result is a fast, 4-step text-to-image pipeline that balances speed and quality under the permissive Apache-2.0 license for the Flux.1 Schnell weights.
API
Use this workflow from code
Every Comfy workflow is a JSON graph. The payload below is this workflow, exactly as ComfyUI runs it — fetch it from the URL, keep it in version control, or load it in ComfyUI and run it node by node.
Run it from TypeScript or Python with the Comfy SDK. The same code targets Comfy Cloud or a ComfyUI you host yourself — only the base URL changes.
// Install (beta)
npm i @comfyorg/sdk
// Run "Flux.1 Schnell Full: Text to Image" (TypeScript)
import { Comfy } from "@comfyorg/sdk";
const client = new Comfy({ apiKey: "comfyui-..." });
// This workflow, exported in API format (see note below)
const wf = await client.workflows.fromFile("flux_schnell_full_text_to_image_api.json");
wf.setInput("41", "text", "your prompt here"); // CLIPTextEncode
const job = await client.run(wf);
await job.getOutputs("9")[0].toFile("output.png"); // SaveImageThe SDK takes a workflow in API format: open this workflow in ComfyUI and use File → Export Workflow (API).
Comfy Cloud API access requires a plan with an API key.
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