Image

Flux 2 Klein 4B LoRA

Credit-based pricing. Supports batch up to 4.

Try Flux 2 Klein 4B LoRA →Compare models

Output

image

Aspect ratio

1:1, 16:9, 9:16, 4:3, 3:4, 21:9, 9:21, Custom

Resolution

512, 1024, 2048, 4096

Max batch

Inputs

Batch up to 4 per request

Example prompt

A vintage 1950s science fiction pulp novel cover, retro rocket ship launching from a crater-pocked alien world, a ringed gas giant looming in the alien sky, hand-painted illustration, warm yellows and oranges, dramatic shadow play

Try this prompt →

LLM-ready

API & LLM schema

Exact request contract for this model. Agents can fetch it from /api/v1/models?id=fal-ai/flux-2/klein/4b/base/lora.

POST/api/v1/generate23 fields · 2 required

Field	Type	Requirement	Contract
`model_id`	constant	Required	ArtEmotion model identifier.
`extra`	object	Optional	Model-specific settings may also be nested here.
`max_credits`	number	Optional	Reject before submission if the estimated list price exceeds this cap. · Range: 1–…
`webhook_url`	string	Optional	Format: uri
`webhook_secret`	string	Optional	Optional model input.
`folder_id`	string	Optional	Optional model input.
`prompt`	string	Required	Optional model input.
`lora_path`	string	Optional	URL or path to the first LoRA weights. · Default:
`lora_scale`	number	Optional	Blend strength for LoRA 1 (0 = off, 1 = full). · Default: 1 · Range: 0–4
`lora_path_2`	string	Optional	URL or path to the second LoRA weights. · Default:
`lora_scale_2`	number	Optional	Blend strength for LoRA 2. · Default: 1 · Range: 0–4
`lora_path_3`	string	Optional	URL or path to the third LoRA weights. · Default:
`lora_scale_3`	number	Optional	Blend strength for LoRA 3. · Default: 1 · Range: 0–4
`acceleration`	string	Optional	The acceleration level to use for image generation. · Allowed: none, regular, high · Default: regular
`negative_prompt`	string	Optional	Negative prompt for classifier-free guidance. Describes what to avoid in the image. · Default:
`guidance_scale`	number	Optional	Guidance scale for classifier-free guidance. · Default: 5 · Range: 0–20
`enable_safety_checker`	boolean	Optional	If set to true, the safety checker will be enabled. · Default: true
`num_inference_steps`	number	Optional	The number of inference steps to perform. · Default: 28 · Range: 4–50
`output_format`	string	Optional	The format of the generated image. · Allowed: jpeg, png, webp · Default: png
`seed`	integer	Optional	The seed to use for the generation. If not provided, a random seed will be used.
`aspect_ratio`	string	Optional	Allowed: 1:1, 16:9, 9:16, 4:3, 3:4, 21:9, 9:21, Custom
`resolution`	string	Optional	Allowed: 512, 1024, 2048, 4096
`num_images`	integer	Optional	Range: 1–4

Minimal request example

{
  "model_id": "fal-ai/flux-2/klein/4b/base/lora",
  "prompt": "A vintage 1950s science fiction pulp novel cover, retro rocket ship launching from a crater-pocked alien world, a ringed gas giant looming in the alien sky, hand-painted illustration, warm yellows and oranges, dramatic shadow play"
}

Raw JSON Schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://www.artemotion.ai/api/v1/models?id=fal-ai%2Fflux-2%2Fklein%2F4b%2Fbase%2Flora",
  "title": "Flux 2 Klein 4B LoRA generation request",
  "description": "Request body accepted by POST /api/v1/generate for fal-ai/flux-2/klein/4b/base/lora.",
  "type": "object",
  "properties": {
    "model_id": {
      "type": "string",
      "const": "fal-ai/flux-2/klein/4b/base/lora",
      "description": "ArtEmotion model identifier."
    },
    "extra": {
      "type": "object",
      "additionalProperties": true,
      "description": "Model-specific settings may also be nested here."
    },
    "max_credits": {
      "type": "number",
      "minimum": 1,
      "description": "Reject before submission if the estimated list price exceeds this cap."
    },
    "webhook_url": {
      "type": "string",
      "format": "uri",
      "maxLength": 2048
    },
    "webhook_secret": {
      "type": "string",
      "maxLength": 512
    },
    "folder_id": {
      "type": "string"
    },
    "prompt": {
      "type": "string"
    },
    "lora_path": {
      "title": "LoRA 1",
      "description": "URL or path to the first LoRA weights.",
      "default": "",
      "type": "string"
    },
    "lora_scale": {
      "title": "LoRA 1 Scale",
      "description": "Blend strength for LoRA 1 (0 = off, 1 = full).",
      "default": 1,
      "type": "number",
      "minimum": 0,
      "maximum": 4,
      "multipleOf": 0.05
    },
    "lora_path_2": {
      "title": "LoRA 2",
      "description": "URL or path to the second LoRA weights.",
      "default": "",
      "type": "string"
    },
    "lora_scale_2": {
      "title": "LoRA 2 Scale",
      "description": "Blend strength for LoRA 2.",
      "default": 1,
      "type": "number",
      "minimum": 0,
      "maximum": 4,
      "multipleOf": 0.05
    },
    "lora_path_3": {
      "title": "LoRA 3",
      "description": "URL or path to the third LoRA weights.",
      "default": "",
      "type": "string"
    },
    "lora_scale_3": {
      "title": "LoRA 3 Scale",
      "description": "Blend strength for LoRA 3.",
      "default": 1,
      "type": "number",
      "minimum": 0,
      "maximum": 4,
      "multipleOf": 0.05
    },
    "acceleration": {
      "title": "Acceleration",
      "description": "The acceleration level to use for image generation.",
      "default": "regular",
      "type": "string",
      "enum": [
        "none",
        "regular",
        "high"
      ]
    },
    "negative_prompt": {
      "title": "Negative Prompt",
      "description": "Negative prompt for classifier-free guidance. Describes what to avoid in the image.",
      "default": "",
      "type": "string"
    },
    "guidance_scale": {
      "title": "Guidance Scale",
      "description": "Guidance scale for classifier-free guidance.",
      "default": 5,
      "type": "number",
      "minimum": 0,
      "maximum": 20
    },
    "enable_safety_checker": {
      "title": "Enable Safety Checker",
      "description": "If set to true, the safety checker will be enabled.",
      "default": true,
      "type": "boolean"
    },
    "num_inference_steps": {
      "title": "Num Inference Steps",
      "description": "The number of inference steps to perform.",
      "default": 28,
      "type": "number",
      "minimum": 4,
      "maximum": 50,
      "multipleOf": 1
    },
    "output_format": {
      "title": "Output Format",
      "description": "The format of the generated image.",
      "default": "png",
      "type": "string",
      "enum": [
        "jpeg",
        "png",
        "webp"
      ]
    },
    "seed": {
      "title": "Seed",
      "description": "The seed to use for the generation. If not provided, a random seed will be used.",
      "type": "integer"
    },
    "aspect_ratio": {
      "type": "string",
      "enum": [
        "1:1",
        "16:9",
        "9:16",
        "4:3",
        "3:4",
        "21:9",
        "9:21",
        "Custom"
      ]
    },
    "resolution": {
      "type": "string",
      "enum": [
        "512",
        "1024",
        "2048",
        "4096"
      ]
    },
    "num_images": {
      "type": "integer",
      "minimum": 1,
      "maximum": 4
    }
  },
  "required": [
    "model_id",
    "prompt"
  ],
  "additionalProperties": false
}

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FAQ

How much does Flux 2 Klein 4B LoRA cost on ArtEmotion?

Credit-based pricing. You pay in ArtEmotion credits — every plan and top-up converts USD to credits at a fixed rate.

Do I get my credits back if Flux 2 Klein 4B LoRA fails?

Yes — failed generations are never charged. The credits are released back to your balance automatically.

Can I call Flux 2 Klein 4B LoRA from the API?

Yes. Use POST /api/v1/generate with model_id: "fal-ai/flux-2/klein/4b/base/lora". See the API reference for the full schema.

Where are my generations stored?

Every output is saved to your personal Library. You can export or delete everything any time from Privacy & deletion.

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