Sourceful's lightweight Riverflow 2 variant for fast workflows and lower cost, combining unified text-to-image generation with precise editing capabilities
Details
riverflow-2-fast-preview
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Access riverflow-2-fast-preview via our unified API.
Providers & Pricing (1)
Riverflow 2 Fast Preview is available exclusively through Runware, starting at $0.03/image.
runware/riverflow-2-fast-preview
riverflow-2-fast API OpenAI-compatible
Integrate Riverflow 2 Fast Preview into your application via the Lumenfall API to perform high-speed text-to-image generation and real-time image editing through a single OpenAI-compatible endpoint.
https://api.lumenfall.ai/openai/v1
riverflow-2-fast-preview
Text to Image Generate
Create images from text descriptions
curl -X POST \ https://api.lumenfall.ai/openai/v1/images/generations \ -H "Authorization: Bearer $LUMENFALL_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "riverflow-2-fast-preview", "prompt": "A serene mountain landscape at sunset", "size": "1024x1024" }'# Response:# { "created": 1234567890, "data": [{ "url": "https://...", "revised_prompt": "..." }] }import OpenAI from 'openai';const client = new OpenAI({ apiKey: 'YOUR_API_KEY', baseURL: 'https://api.lumenfall.ai/openai/v1'});const response = await client.images.generate({ model: 'riverflow-2-fast-preview', prompt: 'A serene mountain landscape at sunset', size: '1024x1024'});// { created: 1234567890, data: [{ url: "https://...", revised_prompt: "..." }] }console.log(response.data[0].url);from openai import OpenAIclient = OpenAI( api_key="YOUR_API_KEY", base_url="https://api.lumenfall.ai/openai/v1")response = client.images.generate( model="riverflow-2-fast-preview", prompt="A serene mountain landscape at sunset", size="1024x1024")# { created: 1234567890, data: [{ url: "https://...", revised_prompt: "..." }] }print(response.data[0].url)Image Editing Edit
Transform existing images with text instructions
curl -X POST \ https://api.lumenfall.ai/openai/v1/images/edits \ -H "Authorization: Bearer $LUMENFALL_API_KEY" \ -F "model=riverflow-2-fast-preview" \ -F "[email protected]" \ -F "prompt=Add a starry night sky to this image" \ -F "size=1024x1024"# Response:# { "created": 1234567890, "data": [{ "url": "https://...", "revised_prompt": "..." }] }import OpenAI from 'openai';import fs from 'fs';const client = new OpenAI({ apiKey: 'YOUR_API_KEY', baseURL: 'https://api.lumenfall.ai/openai/v1'});const response = await client.images.edit({ model: 'riverflow-2-fast-preview', image: fs.createReadStream('source.png'), prompt: 'Add a starry night sky to this image', size: '1024x1024'});// { created: 1234567890, data: [{ url: "https://...", revised_prompt: "..." }] }console.log(response.data[0].url);from openai import OpenAIclient = OpenAI( api_key="YOUR_API_KEY", base_url="https://api.lumenfall.ai/openai/v1")response = client.images.edit( model="riverflow-2-fast-preview", image=open("source.png", "rb"), prompt="Add a starry night sky to this image", size="1024x1024")# { created: 1234567890, data: [{ url: "https://...", revised_prompt: "..." }] }print(response.data[0].url)Gallery
View all 4 imagesRiverflow 2 Fast Preview FAQ
Riverflow 2 Fast Preview starts at $0.03 per image through Lumenfall. Pricing varies by provider. Lumenfall does not add any markup to provider pricing.
You can use Riverflow 2 Fast Preview through Lumenfall's OpenAI-compatible API. Send requests to the unified endpoint with model ID "riverflow-2-fast-preview". Code examples are available in Python, JavaScript, and cURL.
Riverflow 2 Fast Preview is available through Runware on Lumenfall. Lumenfall automatically routes requests to the best available provider.
Riverflow 2 Fast Preview supports images up to 1024x1024 resolution.
Overview
Riverflow 2 Fast Preview is a lightweight image generation model developed by Sourceful, designed specifically for rapid prototyping and low-latency iteration. It functions as an optimized variant of the standard Riverflow 2 architecture, balancing computational efficiency with high-fidelity output. The model is distinctive for its dual-mode capability, allowing users to perform both initial text-to-image generation and subsequent precise image editing within a single, unified framework.
Strengths
- Low-Latency Generation: Optimized for speed, making it suitable for real-time applications, live previews, and high-frequency drafting sessions where standard models would be too slow.
- Contextual Image Editing: Unlike models that focus solely on generation, this model handles image-to-image tasks and localized edits while maintaining the stylistic consistency of the original input.
- Semantic Alignment: Demonstrates strong adherence to complex text prompts, ensuring that the visual elements generated accurately reflect descriptive adjectives and spatial relationships.
- Resource Efficiency: Provides a cost-effective alternative for high-volume workflows ($0.03 starting price) without the heavy compute requirements of larger diffusion models.
Limitations
- Fine Detail Resolution: As a “Fast Preview” variant, it may lack the intricate micro-textures and hyper-realistic skin or surface details found in the full-scale Riverflow 2 model.
- Complex Text Rendering: While proficient at object placement, the model may struggle with rendering long strings of legible text or very small, complex typographical elements within an image.
- Compositional Stability: In highly crowded scenes with many subjects, the model may occasionally introduce anatomical inconsistencies or overlapping artifacts compared to larger, slower models.
Technical Background
Riverflow 2 Fast Preview belongs to the Riverflow family of models, characterized by an architecture that integrates text-to-image and image-to-image modalities into a single pipeline. The training approach focuses on distillation and weight optimization to reduce inference steps while preserving the latent space’s expressive power. This allows the model to process both text and image inputs natively, facilitating seamless transitions between creative generation and iterative refinement.
Best For
- Rapid Prototyping: Ideal for designers and developers who need to generate a high volume of concepts or “mood board” assets quickly.
- Interactive Applications: Suitable for UI/UX environments where users expect near-instant visual feedback based on prompt changes.
- Iterative Editing Workflows: Effective for tasks where an initial image needs constant, minor adjustments to color, composition, or specific objects.
Riverflow 2 Fast Preview is available for testing and integration through Lumenfall’s unified API and interactive playground, allowing you to compare its performance against other models in the Riverflow family.
Try Riverflow 2 Fast Preview in Playground
Generate images with custom prompts — no API key needed.