<h1 id="flux.2-klein-4b-aio-workflow-v1">🎨 FLUX.2 [klein] 4B AIO Workflow v1</h1><p><strong>Official workflow for FLUX.2 [klein] 4B AIO models</strong></p><hr /><h2 id="what's-included">✨ What's Included</h2><ul><li><p>⚡ Optimized Text-to-Image generation</p></li><li><p>🔼 Optional upscaling pipeline</p></li><li><p>💾 Auto-save with full metadata</p></li><li><p>🔍 Before/After image comparison</p></li><li><p>📖 Built-in LoRA support (toggle on/off)</p></li><li><p>📐 Pre-configured for 1024×1024 native resolution</p></li></ul><hr /><h2 id="compatible-models">🔄 Compatible Models</h2><h3 id="fp8-aio-(~7.7-gb)-recommended">🟡 FP8-AIO (~7.7 GB) – Recommended</h3><h3 id="fp16-aio-(~15-gb)-older-gpus">🔵 FP16-AIO (~15 GB) – Older GPUs</h3><h3 id="bf16-aio-(~15-gb)-best-quality">🟢 BF16-AIO (~15 GB) – Best Quality</h3><p>All versions work with this workflow!</p><hr /><h2 id="pre-configured-settings">⚙️ Pre-Configured Settings</h2><ul><li><p><strong>Steps:</strong> 4 (step-distilled)</p></li><li><p><strong>CFG:</strong> 1.0 ⚠️</p></li><li><p><strong>Sampler:</strong> euler</p></li><li><p><strong>Scheduler:</strong> simple</p></li><li><p><strong>Resolution:</strong> 1024×1024</p></li></ul><h3 id="critical:-keep-cfg-at-1.0!">⚠️ CRITICAL: Keep CFG at 1.0!</h3><p>This is a distilled model. Higher CFG = worse results!</p><hr /><h2 id="required-custom-nodes">📦 Required Custom Nodes</h2><p><strong>Install via ComfyUI Manager:</strong></p><ul><li><p><strong>rgthree-comfy</strong> – Image comparison, LoRA toggle</p></li><li><p><strong>comfyui_image_metadata_extension</strong> – Auto-save metadata</p></li></ul><hr /><h2 id="quick-start">🚀 Quick Start</h2><ol><li><p>Download workflow (.json)</p></li><li><p>Import into ComfyUI</p></li><li><p>Select your FLUX.2 [klein] 4B AIO model</p></li><li><p>Write your prompt</p></li><li><p>Generate!</p></li></ol><hr /><h2 id="model-installation">📂 Model Installation</h2><pre><code>ComfyUI/models/checkpoints/
└── flux-2-klein-4b-fp8-aio.safetensors
</code></pre><hr /><h2 id="workflow-features">💡 Workflow Features</h2><h3 id="base-generation">🎨 Base Generation</h3><ul><li><p>Natural language prompts</p></li><li><p>4-6 steps for best results</p></li><li><p>No negative prompts needed</p></li></ul><h3 id="upscaling-(optional)">🔼 Upscaling (Optional)</h3><ul><li><p>1.5x scale by default</p></li><li><p>Denoise 0.3 preserves details</p></li><li><p>Adjustable to your needs</p></li></ul><h3 id="auto-save">💾 Auto-Save</h3><ul><li><p>PNG with full metadata</p></li><li><p>Easy CivitAI uploads</p></li><li><p>All settings preserved</p></li></ul><h3 id="image-comparison">🔍 Image Comparison</h3><ul><li><p>Side-by-side view</p></li><li><p>Base vs Upscaled</p></li><li><p>Slide comparison mode</p></li></ul><hr /><h2 id="tips">🎯 Tips</h2><ul><li><p><strong>Portrait:</strong> Set resolution to 768×1024 or 832×1216</p></li><li><p><strong>Landscape:</strong> Set resolution to 1024×768 or 1216×832</p></li><li><p><strong>Square:</strong> Keep 1024×1024 (native, best quality)</p></li><li><p><strong>LoRAs:</strong> Toggle via "Fast Groups Bypasser" node</p></li></ul><hr /><h2 id="links">🔗 Links</h2><ul><li><p><strong>Model Download:</strong> <a rel="ugc" href="https://civarchive.com/models/2327389/flux2-klein-aio?modelVersionId=2618128">CivitAI Model Page</a></p></li><li><p><strong>Original Model:</strong> <a target="_blank" rel="ugc" href="https://huggingface.co/black-forest-labs/FLUX.2-klein-4B">Black Forest Labs</a></p></li><li><p><strong>rgthree-comfy:</strong> <a target="_blank" rel="ugc" href="https://github.com/rgthree/rgthree-comfy">GitHub</a></p></li><li><p><strong>Metadata Extension:</strong> <a target="_blank" rel="ugc" href="https://github.com/edelvarden/comfyui_image_metadata_extension">GitHub</a></p></li></ul><hr /><p><strong>Version:</strong> 1.0<br /><strong>Updated:</strong> January 2026<br /><strong>License:</strong> Apache 2.0</p><hr /><p><em>Sub-second image generation made simple!</em> ⚡</p>

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