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black-forest-labs/flux-schnell-lora

The fastest image generation model tailored for fine-tuned use

Capabilities

Seed

Cost

Community model (estimated from hardware time)

Input Parameters

prompt required string

Prompt for generated image

aspect_ratio string

Aspect ratio for the generated image

Default: "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.

Default: 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.

Default: 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.

Default: 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

Default: "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.

Default: 4 min: 1, max: 4
num_outputs integer

Number of outputs to generate

Default: 1 min: 1, max: 4
output_format string

Format of the output images

Default: "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

Default: 80 min: 0, max: 100
seed integer

Random seed. Set for reproducible generation

Version: 83180e3ae073 Updated: 6/26/2026 3.7M runs