seedinteger
The seed to use for the generation.
Flux 2 Pro Text to Image
bfl/flux-2/proFlux 2 Pro by BFL - generate stunning images from text prompts with state-of-the-art AI. Supports multiple aspect ratios, styles, and high-resolution output for creative and commercial use.
Try the model
Playground
Input
The prompt to generate an image from.
Additional Settings More
Customize your input with more control.
The format of the generated image. Allowed values: jpeg, png.
The aspect ratio of the generated image. Allowed values: 21:9, 16:9, 3:2, 4:3, 5:4, 1:1, 4:5, 3:4, 2:3, 9:16.
The seed to use for the generation.
ResultExample
What would you like to do next?
Examples
Select an example to load its inputs and result into the playground.
- Open result ↗
Input
{ "prompt": "An intense close-up of knight's visor reflecting battle, sword raised, flames in background, chiaroscuro helmet shadows, hyper-detailed armor, square medieval, cinematic lighting" }
Human preference
Arena
Elo ratings from blind side-by-side votes, compared with other image and video models.
Rankings sourced from Artificial Analysis Arena
- Leaderboard
- Text to Image
- Rank
- #44 of 106
- Elo
- 1003 ±10
- Gap to #1
- −219
Text-to-image arena: people pick the better of two images generated from the same prompt, without seeing the model names.
- #39Seedream 5.0 Lite1017±12
- #40Ideogram 4.5 (High)1015±15
- #41Wan2.6 Text to Image1014±12
- #42GPT Image 1 (high)1013±12
- #43Krea 2 Medium1012±9
- #44FLUX.2 [pro]1003±10
- #45Ideogram 4.01002±10
- #46FLUX.2 [dev]1000
- #47Ming-Image-0.1-Design999±9
- #48P-Image-Ideogram (High)995±14
Flux 2 Pro Text to Image
FLUX.2 [pro], BFL's production tier: high quality at a predictable per-image price. Text to image.
Fields
| Field | Type | Default | Notes |
|---|---|---|---|
prompt | string, required | — | Text instruction. |
output_format | jpeg / png | jpeg | Output file format. |
aspect_ratio | 21:9 / 16:9 / 3:2 / 4:3 / 5:4 / 1:1 / 4:5 / 3:4 / 2:3 / 9:16 | 16:9 | Output shape. |
seed | integer | random | Fix it to compare prompt changes. |
Billing
$0.03 per image.
| Request | Price |
|---|---|
| One image | $0.03 |
Failed runs are not charged.
Prompting
- Write subject, setting, composition, style, then light.
- Quote any text that must appear.
Limits
- One output image per request.
Also on SandBase
Other FLUX.2 endpoints: bfl/flux-2/max, bfl/flux-2/flex, bfl/flux-2/dev, bfl/flux-2/turbo, bfl/flux-2/pro/edit.
Start building
Send your first request
Submit this model through the SandBase Unified Run API.
# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
-X POST "https://api.sandbase.ai/v1/run" \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
-H "Content-Type: application/json" \
--data-binary @- <<'SANDBASE_JSON'
{
"model": "bfl/flux-2/pro",
"prompt": "An intense close-up of knight's visor reflecting battle, sword raised, flames in background, chiaroscuro helmet shadows, hyper-detailed armor, square medieval, cinematic lighting",
"aspect_ratio": "16:9",
"output_format": "jpeg"
}
SANDBASE_JSON
)
run_id=$(printf '%s' "$result" | jq -r .id)
for attempt in $(seq 1 120); do
status=$(printf '%s' "$result" | jq -r .status)
case "$status" in completed|failed|timeout) break ;; esac
sleep 2
result=$(curl --fail-with-body --silent \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
"https://api.sandbase.ai/v1/run/$run_id")
done
status=$(printf '%s' "$result" | jq -r .status)
[ "$status" = completed ] || { echo "Generation ended: $status" >&2; exit 1; }
printf '%s\n' "$result"2. Authentication
Create a SandBase API key and set it in your server environment. All requests use Bearer authentication.
export SANDBASE_API_KEY="YOUR_API_KEY"Keep the key on your server. Do not expose it in browser code or commit it to a repository.
3. Queue
Submit a request
POST to /v1/run with this model ID and its inputs. The request example above includes submission and polling.
Fetch request status and result
Use the returned run ID to poll until the status is completed, failed or timeout. Read output only after completed.
curl "https://api.sandbase.ai/v1/run/$RUN_ID" \
-H "Authorization: Bearer $SANDBASE_API_KEY"4. Files
Hosted files
Pass a publicly accessible file URL in the model’s image, video or audio field. Supported formats and limits are shown beside each Playground input.
Uploading images
Use the upload or replace control on supported image fields in the Playground. Video URL fields accept a hosted driving video; they do not imply video-upload support.
5. Schema
Input
promptstringrequired
The prompt to generate an image from.
aspect_ratiostring
The aspect ratio of the generated image.
Default: "16:9"
Possible values: "21:9", "16:9", "3:2", "4:3", "5:4", "1:1", "4:5", "3:4", "2:3", "9:16"
output_formatstring
The format of the generated image.
Default: "jpeg"
Possible values: "jpeg", "png"
{
"model": "bfl/flux-2/pro",
"prompt": "An intense close-up of knight's visor reflecting battle, sword raised, flames in background, chiaroscuro helmet shadows, hyper-detailed armor, square medieval, cinematic lighting",
"aspect_ratio": "16:9",
"output_format": "jpeg"
}Output
A completed run exposes its result in output. The following is the model’s saved example, not a new generation.
[
{
"source": "BFL/FLUX schema mirror",
"source_url": "https://docs.bfl.ai/flux_2/flux2_overview",
"url": "https://static.sandbase.ai/examples/c426a754-42e5-417e-ab0c-2a83d76cb920/output/cbe48a0e-c121-4d66-9317-759e20e7ded0.png"
}
]