FLUX.2 Dev API

Parameters

32B

Black Forest Labs' FLUX.2 [dev], released with open weights on 25 November 2025.

Reference images

3

Edit mode takes one to three source images and can combine people from separate photos.

Long side at 2k

2048 px

1k is about one megapixel; 2k reaches 2048 pixels on the long side.

Aspect ratios

9

From 21:9 to 9:21, with the same price at every ratio.

Colour codes

Hex

Write a value such as #E9A23B in the prompt and the model steers the colour of light and objects towards it.

Content filter

None

Uncensored: no review of the prompt or the result, and no refusals in our tests.

Renders: on screen as written. Softened: generated, but milder than what was written. Refused: rejected. Not tested yet: we have not run that level on that mode.

• Text to image

  Two women, a quoted sign and warm lamps

  Photograph of two women in their late thirties in a small vintage record store after closing time. One, with a cropped black pixie cut, a few grey strands and gold hoop earrings, sits on the wooden counter wearing a loose oatmeal cardigan slipping off one shoulder over a thin black camisole and high-waisted jeans; the other, a Black woman with a short natural afro and laugh lines, stands close beside her in a fitted burgundy turtleneck. They hold a vinyl record sleeve between them, foreheads almost touching, laughing softly. Crates of records, warm #E9A23B tungsten lamps, a small sign hanging on the glass door reads "CLOSED". 35mm film photo, soft grain, shallow depth of field.

  Why it works. Clothing, hair and the shared record are spelled out, the sign text is in quotes and the lamp colour is a hex code. The sign reads CLOSED and the warm glow follows the colour.

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• Text to image

  Neon light in a motel room

  Photograph of a woman in her mid-thirties with damp, tousled auburn hair sitting on the edge of a motel bed at night, wearing a champagne silk slip dress with one thin strap slipped off her shoulder, legs crossed, looking toward the camera with a calm, knowing expression. Through the window behind her, a pink neon sign reads "VACANCY". The sign washes the room in #FF4F8B magenta mixed with cool #3AA7FF blue. 35mm film photo, visible grain, slightly soft focus at the edges.

  Why it works. Two hex colours for the light, a quoted sign and a film look. The room takes on the magenta and blue mix and the sign is spelled correctly.

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• Text to image

  Two men on a sailboat deck

  Photograph of two men in their late thirties on the teak deck of a sailboat at golden hour. One, shirtless and sun-tanned with a short dark beard, sits on the deck coiling a rope; the other, in an unbuttoned white linen shirt and navy swim shorts, leans against the mast laughing and holds out a plain brown glass bottle to him. Low warm sun flaring behind the sail, sea in #2E6F95, light sea spray, candid documentary style, 35mm.

  Why it works. A candid documentary scene: low sun, sea colour and what each man is doing. Both read as relaxed and natural in the golden light.

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• Image editing

  The same man in a hotel bar

  Same man, same face and beard, alone in the frame. It is now late at night after work: his suit jacket is gone, his navy tie hangs loose and untied around his neck, and his white shirt is fully unbuttoned and hanging open over his bare chest, sleeves rolled to the elbows. Replace the bright office with a dim hotel bar of dark wood and warm #D98E04 amber lamps. He leans one elbow on the bar holding a glass of whiskey and gives a slow, confident smile toward the camera. Realistic photograph, shallow depth of field. No other people.

  Why it works. One portrait, and the prompt lists what changes in the clothes and the room. The face and beard stay while the whole mood shifts.

  This mode starts from your own image: add it in the playground before you run.

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• Image editing

  Two separate portraits, one scene

  Combine the two people into one scene: the woman from image 1 and the man from image 2 slow-dancing close together in an old stone wine cellar lit by candles. Keep both faces exactly as in the photos, with the same age, features and fine lines; her face is turned toward the camera, resting against his shoulder. She now wears a midnight-blue silk dress with thin straps and an open back, her hair still in a low bun with small gold hoop earrings; he wears a white dress shirt open at the collar with the sleeves rolled up, and dark trousers. His hand rests on her bare lower back. Warm #F4A259 candlelight, deep shadows, 35mm film look.

  Why it works. Each person is named by image number and the faces are marked as fixed. Both stay recognisable in the new candlelit setting.

  This mode starts from your own image: add it in the playground before you run.

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One image starts at $0.012 at 1K and $0.012 at 2K.

The playground shows the exact price for your settings before you run. Failed or timed-out tasks are usually not charged. Some models charge for content refusals as stated on their model page; check those billing terms before submitting.

About FLUX.2 Dev

FLUX.2 [dev] is the open-weights FLUX.2 model: photographic portraits, readable text, hex colour control and up to three reference images, in nine shapes up to 2048 pixels. There is no filter and no refusal. In our tests it delivered every level as asked except Very strong, which it toned down.