black-forest-labs/flux-schnell-lora
The fastest image generation model tailored for fine-tuned use
Capabilities
Cost
Community model (estimated from hardware time)
Input Parameters
| Name | Type | Description | Default | Constraints |
|---|---|---|---|---|
prompt * | string | Prompt for generated image | — | — |
aspect_ratio | string | Aspect ratio for the generated image | "1:1" | 1:1 16:9 21:9 3:2 2:3 4:5 5:4 3:4 4:3 9:16 9:21 |
disable_safety_checker | boolean | Disable safety checker for generated images. | false | — |
go_fast | boolean | Run faster predictions with model optimized for speed (currently fp8 quantized); disable to run in original bf16. Note that outputs will not be deterministic when this is enabled, even if you set a seed. | true | — |
lora_scale | number | Determines how strongly the main LoRA should be applied. Sane results between 0 and 1 for base inference. For go_fast we apply a 1.5x multiplier to this value; we've generally seen good performance when scaling the base value by that amount. You may still need to experiment to find the best value for your particular lora. | 1 | min: -1, max: 3 |
lora_weights | string | Load LoRA weights. Supports Replicate models in the format <owner>/<username> or <owner>/<username>/<version>, HuggingFace URLs in the format huggingface.co/<owner>/<model-name>, CivitAI URLs in the format civitai.com/models/<id>[/<model-name>], or arbitrary .safetensors URLs from the Internet. For example, 'fofr/flux-pixar-cars' | — | — |
megapixels | string | Approximate number of megapixels for generated image | "1" | 1 0.25 |
num_inference_steps | integer | Number of denoising steps. 4 is recommended, and lower number of steps produce lower quality outputs, faster. | 4 | min: 1, max: 4 |
num_outputs | integer | Number of outputs to generate | 1 | min: 1, max: 4 |
output_format | string | Format of the output images | "webp" | webp jpg png |
output_quality | integer | Quality when saving the output images, from 0 to 100. 100 is best quality, 0 is lowest quality. Not relevant for .png outputs | 80 | min: 0, max: 100 |
seed | integer | Random seed. Set for reproducible generation | — | — |
prompt required string Prompt for generated image
aspect_ratio string Aspect ratio for the generated image
"1:1" disable_safety_checker boolean Disable safety checker for generated images.
false go_fast boolean Run faster predictions with model optimized for speed (currently fp8 quantized); disable to run in original bf16. Note that outputs will not be deterministic when this is enabled, even if you set a seed.
true lora_scale number Determines how strongly the main LoRA should be applied. Sane results between 0 and 1 for base inference. For go_fast we apply a 1.5x multiplier to this value; we've generally seen good performance when scaling the base value by that amount. You may still need to experiment to find the best value for your particular lora.
1 min: -1, max: 3 lora_weights string Load LoRA weights. Supports Replicate models in the format <owner>/<username> or <owner>/<username>/<version>, HuggingFace URLs in the format huggingface.co/<owner>/<model-name>, CivitAI URLs in the format civitai.com/models/<id>[/<model-name>], or arbitrary .safetensors URLs from the Internet. For example, 'fofr/flux-pixar-cars'
megapixels string Approximate number of megapixels for generated image
"1" num_inference_steps integer Number of denoising steps. 4 is recommended, and lower number of steps produce lower quality outputs, faster.
4 min: 1, max: 4 num_outputs integer Number of outputs to generate
1 min: 1, max: 4 output_format string Format of the output images
"webp" output_quality integer Quality when saving the output images, from 0 to 100. 100 is best quality, 0 is lowest quality. Not relevant for .png outputs
80 min: 0, max: 100 seed integer Random seed. Set for reproducible generation
83180e3ae073 Updated: 6/26/2026 3.7M runs
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