ComfyUI Node
arkennemasis fal · Flux Pro Kontext · $0.04/image
FLUX.1 Kontext [pro] handles both text and reference images as inputs, seamlessly enabling targeted, local edits and complex transformations of entire scenes. Pricing (from fal, 2026-09-29): $0.04 per image (fal's billing unit). Model page: https://fal.ai/models/fal-ai/flux-pro/kontext Key: FAL_KEY in the .env next to run_nvidia_gpu.bat. Results are saved in output/fal/fal-ai_flux-pro_kontext/.
arkennemasis fal · Flux Pro Kontext · $0.04/image
- image
- images
- image_paths
- seed
- has_nsfw_concepts
- prompt
- timings
- info
◄prompt►
◄seed-1►
◄guidance_scale3.50►
◄num_images1►
◄output_formatjpeg►
◄safety_tolerance2►
◄enhance_promptfalse►
◄aspect_ratio(not set)►
◄max_cost_usd20.0►
◄reuse_identical_runtrue►
◄extra_json►
◄max_concurrent1►
Categoryarkennemasis/fal/Image/Flux
Inputs (13)
| Name | Type | Default | Description |
|---|---|---|---|
| prompt | STRING | The prompt to generate an image from. | |
| seed | INT | -1-1–2147483647 | The same seed and the same prompt given to the same version of the model will output the same image every time. -1 leaves it to the model. |
| guidance_scale | FLOAT | 3.501–20 | The CFG (Classifier Free Guidance) scale is a measure of how close you want the model to stick to your prompt when looking for a related image to show you. |
| num_images | INT | 11–4 | The number of images to generate. |
| output_format | COMBO | jpeg | The format of the generated image. |
| safety_tolerance | COMBO | 2 | The safety tolerance level for the generated image. 1 being the most strict and 5 being the most permissive. |
| enhance_prompt | BOOLEAN | false | Whether to enhance the prompt for better results. |
| aspect_ratio | COMBO | (not set) | The aspect ratio of the generated image. '(not set)' leaves it to the model. |
| image | IMAGE | Image prompt for the omni model. | |
| max_cost_usdopt | FLOAT | 20.00–100000 | Safety cap. If the estimated cost of this run is above this many US dollars the node stops BEFORE sending anything to fal. 0 = no cap. |
| reuse_identical_runopt | BOOLEAN | true | If these exact inputs (the settings AND the same pictures/clips/audio) were already paid for and the files are still in output/fal, return them instead of paying again - also after a ComfyUI restart. Turn off for a fresh take with the same settings. |
| extra_jsonopt | STRING | Advanced: a JSON object merged into the request last, for any fal field this node has no box for. Example: {"seed": 7}. Leave empty normally. | |
| max_concurrentopt | INT | 11–32 | How many paid fal calls may run at the same time in one run, across every fal node. 1 (default) = one after another. This node starts its paid part only while fewer than this many fal calls are running. Once any fal node fails, the ones still waiting are not started, so nothing more is billed. |
Outputs (7)
| Name | Type | Description |
|---|---|---|
| images | IMAGE | — |
| image_paths | STRING | — |
| seed | INT | — |
| has_nsfw_concepts | STRING | — |
| prompt | STRING | — |
| timings | STRING | — |
| info | STRING | JSON: request id, cost estimate, saved files and fal's full answer. |