ComfyUI Node
arkennemasis fal · Flux Kontext Dev · $0.025/image
Frontier image editing model. Pricing (from fal, 2026-09-29): $0.025 per megapixel (fal's billing unit). Model page: https://fal.ai/models/fal-ai/flux-kontext/dev Key: FAL_KEY in the .env next to run_nvidia_gpu.bat. Results are saved in output/fal/fal-ai_flux-kontext_dev/.
arkennemasis fal · Flux Kontext Dev · $0.025/image
- image
- images
- image_paths
- timings
- has_nsfw_concepts
- seed
- prompt
- info
◄prompt►
◄num_inference_steps28►
◄seed-1►
◄guidance_scale2.50►
◄num_images1►
◄enable_safety_checkertrue►
◄output_formatjpeg►
◄accelerationnone►
◄resolution_modematch_input►
◄max_cost_usd20.0►
◄reuse_identical_runtrue►
◄extra_json►
◄max_concurrent1►
Categoryarkennemasis/fal/Image/Flux
Inputs (14)
| Name | Type | Default | Description |
|---|---|---|---|
| prompt | STRING | The prompt to edit the image. | |
| image | IMAGE | The URL of the image to edit. Max width: 14142px, Max height: 14142px, Timeout: 20s | |
| num_inference_steps | INT | 2810–50 | The number of inference steps to perform. |
| 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 | 2.501–20 | 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. |
| enable_safety_checker | BOOLEAN | true | If set to true, the safety checker will be enabled. Disabling it requires account authorization; unauthorized requests are always checked, and images flagged as unsafe are returned as black images. |
| output_format | COMBO | jpeg | Output format |
| acceleration | COMBO | none | The speed of the generation. The higher the speed, the faster the generation. |
| resolution_mode | COMBO | match_input | Determines how the output resolution is set for image editing. - `auto`: The model selects an optimal resolution from a predefined set that best matches the input image's aspect ratio. This is the recommended setting for most use cases as it's what the model was trained on. - `match_input`: The model will attempt to use the same resolution as the input image. The resolution will be adjusted to be compatible with the |
| 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 | — |
| timings | STRING | — |
| has_nsfw_concepts | STRING | — |
| seed | INT | — |
| prompt | STRING | — |
| info | STRING | JSON: request id, cost estimate, saved files and fal's full answer. |