Fast distilled version of Black Forest Labs' FLUX.2 [dev] optimized for speed and cost efficiency.
Details
flux.2-dev-flash
Providers & Pricing (1)
FLUX.2 [dev] Flash is available exclusively through fal.ai, starting at $0.005/image.
fal/flux.2-dev-flash
Provider Performance
Fastest generation through fal at 2,225ms median latency with 100.0% success rate.
Aggregated from real API requests over the last 30 days.
Generation Time
Success Rate
Time to First Byte
Provider Rankings
| # | Provider | p50 Gen Time | p95 Gen Time | Success Rate | TTFB (p50) |
|---|---|---|---|---|---|
| 1 | fal | 2,225ms | 3,971ms | 100.0% | 2,225ms |
FLUX.2 [dev] Flash API OpenAI-compatible
Integrate FLUX.2 [dev] Flash via Lumenfall’s OpenAI-compatible API to programmatically generate high-resolution images and perform complex image editing. This endpoint provides low-latency access to fast-distilled text-to-image capabilities for real-time media applications.
https://api.lumenfall.ai/openai/v1
flux.2-dev-flash
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": "flux.2-dev-flash",
"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: 'flux.2-dev-flash',
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 OpenAI
client = OpenAI(
api_key="YOUR_API_KEY",
base_url="https://api.lumenfall.ai/openai/v1"
)
response = client.images.generate(
model="flux.2-dev-flash",
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=flux.2-dev-flash" \
-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: 'flux.2-dev-flash',
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 OpenAI
client = OpenAI(
api_key="YOUR_API_KEY",
base_url="https://api.lumenfall.ai/openai/v1"
)
response = client.images.edit(
model="flux.2-dev-flash",
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)
Benchmarks
FLUX.2 [dev] Flash holds the #7 rank in the text-to-image arena with a competitive Elo rating of 1262. This distilled version achieves high-speed generation while maintaining elite status among leading diffusion models.
Competition Results
Geometric Composition
Text-to-Image“A glass cube on a wooden table. Inside the cube is a small blue sphere. On top of the cube sits a red book. A green plant is behind the cube, partially visible through the glass. Soft window light from the left.”
Heroic Super Hero Portrait
Text-to-Image“Hyper-photorealistic full-body portrait of a female superhero standing triumphantly on a New York skyscraper rooftop at golden sunset, wearing a classic modest superhero costume with flowing cape, chest emblem, gloves, and boots in red and blue colors, practical design, short hair, strong determined heroic expression looking into the distance, powerful confident stance with hands on hips and cape billowing dramatically in the wind, detailed urban cityscape background, warm natural sunlight with sharp shadows and fabric highlights, ultra-sharp textures on suit, hair, and concrete, 8K masterpiece, empowering family-friendly style.”
Intricate Floral Mandala
Text-to-Image“Perfectly symmetrical mandala made entirely of real flowers, petals, leaves, fruits, and seeds in vibrant natural colors, intricate layered patterns with radial symmetry, top-down view on a soft neutral background, hyper-detailed organic textures and subtle shadows, photorealistic, 8K masterpiece.”
Apollo 11: Journey to Tranquility
Text-to-Image“Create a clean, modern vector infographic poster about the Apollo 11 mission. NASA-inspired palette (navy, white, muted red, light gray). Flat-vector style, crisp lines, consistent iconography, subtle gradients only. Steps (stop at landing): 1. Launch (Saturn Vicon) 2. Earth Orbit (Earth + orbit ring icon) 3. Translunar (trajectory arc icon) 4. Lunar Orbit (Moon + orbit ring icon) 5. Descent (lunar module descending icon) 6. Landing (lunar module on the surface icon) Small supporting elements (minimal text): • Crew strip: three silhouette icons with only last names: Armstrong, Aldrin, Collins. • Landing site marker: Moon pin labeled "Tranquility" only. Layout constraints: generous margins, large readable labels, clean background with subtle stars. Vector-only, print-poster look, high resolution.”
Fantasy Warrior
Text-to-Image“Close portrait of a battle-worn paladin in ornate engraved plate armor, hair braided with small beads, faint scars and dirt on the skin, warm torchlight reflecting off metal, shallow depth of field, bokeh sparks, lifelike eyes, highly detailed texture on leather straps and cloth underlayer.”
Adorable Baby Animals in Sunny Meadow
Text-to-Image“Hyper-photorealistic scene of fluffy baby animals—a golden retriever puppy, tabby kitten, baby bunny, and red fox kit—with big expressive eyes and ultra-detailed soft fur, playfully chasing butterflies and tumbling together in a lush wildflower meadow, warm golden sunrise light with god rays and dew sparkles, joyful wholesome vibe, 8K masterpiece.”
Isometric Miniature Diorama Scenes
Text-to-Image“Create a clear, 45° top-down isometric miniature 3D cartoon scene of Japan's signature dish: sushi, with soft refined textures, realistic PBR materials, gentle lighting, on a small raised diorama base with minimal garnish and plate. Solid light blue background. At top-center: 'JAPAN' in large bold text, 'SUSHI' below it, small flag icon. Perfectly centered, ultra-clean, high-clarity, square format.”
Candid Street Photography
Text-to-Image“A candid street photo of an elderly Japanese man repairing a red bicycle in light rain, reflections on wet pavement, shallow depth of field, 50mm lens, natural skin texture, imperfect framing, motion blur from passing cars, cinematic but realistic, no stylization.”
Fantasy Warrior
Text-to-Image“Close portrait of a battle-worn paladin in ornate engraved plate armor, hair braided with small beads, faint scars and dirt on the skin, warm torchlight reflecting off metal, shallow depth of field, bokeh sparks, lifelike eyes, highly detailed texture on leather straps and cloth underlayer.”
Best for
All categoriesGallery
View all 13 imagesFLUX.2 [dev] Flash FAQ
FLUX.2 [dev] Flash starts at $0.005 per image through Lumenfall. Pricing varies by provider. Lumenfall does not add any markup to provider pricing.
You can use FLUX.2 [dev] Flash through Lumenfall's OpenAI-compatible API. Send requests to the unified endpoint with model ID "flux.2-dev-flash". Code examples are available in Python, JavaScript, and cURL.
FLUX.2 [dev] Flash is available through fal.ai on Lumenfall. Lumenfall automatically routes requests to the best available provider.
FLUX.2 [dev] Flash supports images up to 2048x2048 resolution.
Overview
FLUX.2 [dev] Flash is a distilled, high-speed variant of Black Forest Labs’ FLUX.2 [dev] model, developed by fal. It is a text-to-image and image-to-image model architected to provide high-fidelity visual output with significantly lower latency and inference costs than the standard base model. By utilizing distillation techniques, it maintains the structural intelligence of the FLUX.2 architecture while requiring fewer sampling steps to produce a final image.
Strengths
- Inference Speed: Significantly reduces generation time compared to the standard FLUX.2 [dev] model, making it suitable for near real-time applications and rapid prototyping.
- Text Rendering: Retains the core architectural ability to render complex, legible text within generated images with high accuracy.
- Prompt Adherence: Shows strong alignment with complex, multi-layered natural language prompts, following specific instructions regarding composition and object placement.
- Cost Efficiency: With a starting price of $0.005, it offers a more economical pathway for developers to run high-volume image generation workloads without a proportional increase in compute spend.
Limitations
- Non-Commercial License: Distributed under a non-commercial license, which restricts its use to research, hobbyist projects, and personal experimentation rather than production-grade commercial products.
- Fine Detail Compression: As a distilled model, it may exhibit slightly less texture nuance or micro-detail in extremely complex scenes compared to the full-parameter version of FLUX.2 [dev].
- Step Sensitivity: While optimized for fewer steps, pushing the model to extremely low step counts (e.g., 1-2 steps) may result in occasional artifacts not present in the standard dev model.
Technical Background
FLUX.2 [dev] Flash belongs to the FLUX.2 family of flow-matching transformer models. It employs a distillation process designed to compress the sampling trajectory, allowing the model to achieve convergence in a fraction of the iterations required by the original teacher model. This approach prioritizes computational efficiency while preserving the underlying latent representation space established by Black Forest Labs.
Best For
This model is ideal for developers building interactive creative tools, rapid ideation workflows, or research projects where low latency is critical. It is particularly effective for generating UI mockups, social media assets, or storyboard frames where fast iteration is more valuable than maximum-parameter rendering. FLUX.2 [dev] Flash is available for testing and integration through Lumenfall’s unified API and interactive playground.
Top Matchups
See how FLUX.2 [dev] Flash performs head-to-head against other AI image models, ranked by community votes in blind comparisons.
vs Lucid Origin
Fantasy Warrior
67% W · 33% L
vs Stable Diffusion 3.5 Large
Apollo 11: Journey to Tranquility
67% W · 0% L · 33% T
vs FLUX.2 [dev] Turbo
Geometric Composition
50% W · 50% L
vs FLUX.2 [dev] Turbo
Intricate Floral Mandala
0% W · 0% L · 100% T
vs GPT Image 1.5
Adorable Baby Animals in Sunny Meadow
0% W · 100% L
Try FLUX.2 [dev] Flash in Playground
Generate images with custom prompts — no API key needed.