ComfyUI Node
arkennemasis fal · Flux 2 Flex Edit · $0.05/MP
Image editing with FLUX.2 [flex] from Black Forest Labs. Supports multi-reference editing with customizable inference steps and enhanced text rendering. Pricing (from fal, 2026-09-30): Your request will cost $0.05 per megapixel on both input and output side, rounded up to the nearest megapixel. For example, a 1024x1024 image will cost $0.05, and a 1920x1080 image will cost $0.10 ($0.05 × 2 megapixels). Similarly, a 512x512 output will cost $0.06 ($0.05 for 0.26 megapixels, rounded to 1 megapixel). Model page: https://fal.ai/models/fal-ai/flux-2-flex/edit Key: FAL_KEY in the .env next to run_nvidia_gpu.bat. Results are saved in output/fal/fal-ai_flux-2-flex_edit/.
arkennemasis fal · Flux 2 Flex Edit · $0.05/MP
- image_1
- image_2
- image_3
- image_4
- image_5
- image_6
- images
- image_paths
- seed
- info
◄prompt►
◄image_sizeauto►
◄image_size_width1024►
◄image_size_height1024►
◄seed-1►
◄safety_tolerance2►
◄enable_safety_checkertrue►
◄output_formatjpeg►
◄guidance_scale3.50►
◄num_inference_steps28►
◄max_cost_usd20.0►
◄reuse_identical_runtrue►
◄extra_json►
◄max_concurrent1►
Categoryarkennemasis/fal/Image/Flux
Inputs (20)
| Name | Type | Default | Description |
|---|---|---|---|
| prompt | STRING | The prompt to generate an image from. | |
| image_size | COMBO | auto | The size of the generated image. If `auto`, the size will be determined by the model. 'custom' uses the width and height below. |
| image_size_width | INT | 102416–14142 | Width in pixels when image_size is 'custom'. |
| image_size_height | INT | 102416–14142 | Height in pixels when image_size is 'custom'. |
| seed | INT | -1-1–2147483647 | The seed to use for the generation. -1 leaves it to the model. |
| safety_tolerance | COMBO | 2 | The safety tolerance level for the generated image. 1 being the most strict and 5 being the most permissive. |
| enable_safety_checker | BOOLEAN | true | Whether to enable the safety checker. Disabling it requires account authorization; unauthorized requests are always checked. |
| output_format | COMBO | jpeg | The format of the generated image. |
| image_1 | IMAGE | List of URLs of input images for editing Each socket may carry a batch; they are sent in socket order (the first picture of socket 1 is number 1). | |
| guidance_scale | FLOAT | 3.501.5–10 | The guidance scale to use for the generation. |
| num_inference_steps | INT | 282–50 | The number of inference steps to perform. |
| image_2opt | IMAGE | List of URLs of input images for editing Each socket may carry a batch; they are sent in socket order (the first picture of socket 1 is number 1). | |
| image_3opt | IMAGE | List of URLs of input images for editing Each socket may carry a batch; they are sent in socket order (the first picture of socket 1 is number 1). | |
| image_4opt | IMAGE | List of URLs of input images for editing Each socket may carry a batch; they are sent in socket order (the first picture of socket 1 is number 1). | |
| image_5opt | IMAGE | List of URLs of input images for editing Each socket may carry a batch; they are sent in socket order (the first picture of socket 1 is number 1). | |
| image_6opt | IMAGE | List of URLs of input images for editing Each socket may carry a batch; they are sent in socket order (the first picture of socket 1 is number 1). | |
| 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 (4)
| Name | Type | Description |
|---|---|---|
| images | IMAGE | — |
| image_paths | STRING | — |
| seed | INT | — |
| info | STRING | JSON: request id, cost estimate, saved files and fal's full answer. |