## Basic model info

- Model name: black-forest-labs/black-forest-labs flux-2-flex
- Model description: Text-to-image generation with FLUX.2 [flex] from Black Forest Labs. Features adjustable inference steps and guidance scale for fine-tuned control. Enhanced typography and text rendering capabilities.
- Endpoint name: text-to-image


## Model schema

The model schema is defined in the OpenAPI schema: [OpenAPI Schema](https://oapi.sunra.ai/main/black-forest-labs/flux-2-flex/latest.json)

### Model input schema

The model input schema is:



```json
{
  "description": "Input model for FLUX 2 Flex text-to-image generation.",
  "properties": {
    "prompt": {
      "description": "The prompt to generate an image from.",
      "title": "Prompt",
      "type": "string",
      "x-sr-order": 200
    },
    "aspect_ratio": {
      "default": "4:3",
      "description": "Aspect ratio of the generated image.",
      "enum": [
        "1:1",
        "4:3",
        "3:4",
        "16:9",
        "9:16"
      ],
      "title": "Aspect Ratio",
      "type": "string",
      "x-sr-order": 201
    },
    "guidance_scale": {
      "default": 3.5,
      "description": "The guidance scale for generation. Higher values follow the prompt more closely.",
      "maximum": 10,
      "minimum": 1.5,
      "multipleOf": 0.1,
      "title": "Guidance Scale",
      "type": "number",
      "x-sr-order": 300
    },
    "seed": {
      "description": "Seed for reproducibility.",
      "maximum": 2147483647,
      "minimum": 0,
      "title": "Seed",
      "type": "integer",
      "x-sr-order": 202
    },
    "num_inference_steps": {
      "default": 28,
      "description": "The number of inference steps to perform.",
      "maximum": 50,
      "minimum": 2,
      "title": "Num Inference Steps",
      "type": "integer",
      "x-sr-order": 301
    },
    "output_format": {
      "default": "jpeg",
      "description": "Output format for the generated image.",
      "enum": [
        "jpeg",
        "png"
      ],
      "title": "Output Format",
      "type": "string",
      "x-sr-order": 400
    }
  },
  "required": [
    "prompt"
  ],
  "title": "TextToImageInput",
  "type": "object"
}
```



### Model output schema

The model output schema is:



```json
{
  "properties": {
    "images": {
      "items": {
        "properties": {
          "content_type": {
            "description": "The mime type of the file.",
            "title": "Content Type",
            "type": "string"
          },
          "file_name": {
            "description": "The name of the file. It will be auto-generated if not provided.",
            "title": "File Name",
            "type": "string"
          },
          "file_size": {
            "description": "The size of the file in bytes.",
            "title": "File Size",
            "type": "integer"
          },
          "url": {
            "description": "The URL where the file can be downloaded from.",
            "title": "Url",
            "type": "string"
          }
        },
        "required": [
          "content_type",
          "file_name",
          "file_size",
          "url"
        ],
        "title": "SunraFile",
        "type": "object"
      },
      "title": "Images",
      "type": "array"
    }
  },
  "required": [
    "images"
  ],
  "title": "ImagesOutput",
  "type": "object"
}
```



## Example inputs and outputs

Use the following example inputs and outputs to understand the model.

### Input example



```json
{
  "prompt": "",
  "aspect_ratio": "4:3",
  "guidance_scale": 3.5,
  "seed": null,
  "num_inference_steps": 28,
  "output_format": "jpeg"
}
```



### Output example



```json
{
}
```



## Model code examples

### JavaScript



```javascript
import { sunra } from "@sunra/client";

const result = await sunra.subscribe("black-forest-labs/flux-2-flex/text-to-image", {
  input: {
  	prompt: '',
  	aspect_ratio: '4:3',
  	seed: null,
  	guidance_scale: 3.5,
  	num_inference_steps: 28,
  	output_format: 'jpeg'
  },
  logs: true,
  onQueueUpdate: (update) => {
    console.log(`Status Update: ${update.status}, Request ID: ${update.request_id}`);
  },
});
console.log(result.data);
console.log(result.requestId);
```



### Python



```python
import sunra_client

result = sunra_client.subscribe(
    "black-forest-labs/flux-2-flex/text-to-image",
    arguments={
        "prompt": "",
        "aspect_ratio": "4:3",
        "seed": None,
        "guidance_scale": 3.5,
        "num_inference_steps": 28,
        "output_format": "jpeg"
    },
    with_logs=True,
    on_enqueue=print,
    on_queue_update=print,
)
print(result)
```



### Java



```java
import ai.sunra.client.*;
import java.util.Map;
import com.google.gson.JsonObject;

var client = SunraClient.withEnvCredentials();

var response = client.subscribe(
    "black-forest-labs/flux-2-flex/text-to-image",
    SubscribeOptions.<JsonObject>builder()
        .input(Map.of(
            "prompt", "",
            "aspect_ratio", "4:3",
            "seed", null,
            "guidance_scale", 3.5,
            "num_inference_steps", 28,
            "output_format", "jpeg"))
        .resultType(JsonObject.class)
        .onQueueUpdate(update -> System.out.printf(
            "\nStatus Update: %s, Request ID: %s%n",
            update.getStatus(),
            update.getRequestId()
        ))
        .logs(true)
        .build()
);

System.out.println("Completed!");
System.out.println(response.getData());
  
```



### Kotlin



```kotlin
import ai.sunra.client.kt.*
import com.google.gson.JsonObject

val client = createSunraClient()

val response = client.subscribe<JsonObject>(
    endpointId = "black-forest-labs/flux-2-flex/text-to-image",
    input = mapOf(
            "prompt" to "",
            "aspect_ratio" to "4:3",
            "seed" to null,
            "guidance_scale" to 3.5,
            "num_inference_steps" to 28,
            "output_format" to "jpeg"),
    options = ai.sunra.client.kt.SubscribeOptions(logs = true),
    onUpdate = { update ->
        println("\nStatus Update: ${update.status}, Request ID: ${update.requestId}")
    }
)

println("Completed!")
println(response.data)
  
```



### Curl



```bash

curl --request POST \
  --url https://api.sunra.ai/v1/queue/black-forest-labs/flux-2-flex/text-to-image \
  --header "Authorization: Key $SUNRA_KEY" \
  --header "Content-Type: application/json" \
  --data '{"prompt":"","aspect_ratio":"4:3","seed":null,"guidance_scale":3.5,"num_inference_steps":28,"output_format":"jpeg"}'
    
```



## Model readme

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