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Prompt length

Does a longer prompt make a better film?

FLUX.3 reads every word you give it, right out to 4,700 characters — but the film stops getting better at about 1,400, and past 2,400 the extra writing buys texture nobody sees.

takes129modelFLUX.3promptspublished

What we ran

129 takes. One film per ladder, ten rungs per ladder, each rung the same film described at more length: roughly 500, 950, 1,400, 1,900, 2,350, 2,800, 3,250, 3,700, 4,200, 4,700 characters.

E15·1 — six films up the same ladder (60 takes). A dancer's audition (n 1–10), an F1 pit stop (11–20), a diner's last night (21–30), a trawler in heavy weather (31–40), speed chess in a park (41–50), a launch control hold (51–60). Every rung uses seven headings: ACTION, SETTING, SUBJECT, DIALOGUE, CAMERA & LIGHT, SOUND & MUSIC, GRADE.

03E15-C-10 · ~4365 chars20s · 21:9
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1ACTION — A short-order cook makes one last meal on the diner's final night. He scrapes the flat-top clean before laying the eggs down. The regular at the counter watches him work and says nothing. He plates eggs, hash and toast without being asked for an order. He refills her coffee at the exact moment the cup goes empty. She eats slowly, deliberately making the meal outlast closing time. He starts the closing list anyway: grill off, hood fan off, lights. He folds his apron once and sets it on the shelf below the register. She leaves the money under the cup although he already waved it off. He locks the door behind her and turns the sign over for the last time.2 3SETTING — An all-night diner on the edge of a state highway, nearly empty. A long counter with chrome stools, two of them patched with tape. A hand-lettered sign in the window reads: CLOSING — THANK YOU. The flat-top and fryer sit behind a pass with a bell nobody rings. A pie case rotates slowly with one slice of cherry pie left in it. Booth upholstery gone shiny at the edges from fifty years of use. A wall of photographs: staff, regulars, one framed first dollar. Rain on the parking-lot glass, one semi idling under the lot light. Boxes stand half-packed along the back wall where shelves were. The neon OPEN sign buzzes, its O flickering at its own tempo.4 5SUBJECT — A cook in his sixties, forearms scarred with old griddle burns. White tee, white apron gone grey, a paper hat he still bothers with. The customer is a night-shift nurse still in her scrubs. Her coat stays on but open, her bag parked on the next stool. His hands do everything in an order decided decades ago. He wipes surfaces that are already clean without noticing. She has the eyes of someone at the end of a twelve-hour shift. His glasses ride low and get pushed up with the back of a wrist. A small tremor in his hand shows only when he pours. Neither of them is in any hurry to let this end.6 7DIALOGUE — He says: "Kitchen's closed. Sit down anyway." She says: "You know I only came for the coffee." He says: "Then the eggs are on the house." She asks: "What happens to this place on Monday?" He says: "They take the sign first. Sold it to a collector." She says: "That sign is the only landmark this road has." He says: "Forty-one years. My father had it eighteen before me." She says: "Best eggs in the county. That was never a secret." He says: "Everybody says so the week you close." She says: "Goodnight, Ray." He says: "Goodnight. Drive slow."8 9CAMERA & LIGHT — One slow dolly along the counter at seated eye height, 40mm. Warm tungsten practicals inside against blue rain-dark windows. The pass light throws a hard warm rectangle across the flat-top. A static two-shot holds the cook and the nurse across the counter. Cutaways are close and unhurried: eggs, coffee, the taped stool. Neon from the window lays red along the chrome stool caps. Steam off the grill catches the pass light and hangs there. The final setup is from outside, through glass beaded with rain. Reflections layer the neon over both of them in the window shot. Hold the exterior wide as the lights go off in two stages.10 11SOUND & MUSIC — Rain on glass, a compressor hum, eggs hitting the hot flat-top. The scrape of the spatula comes in long, practiced strokes. A radio in the kitchen plays AM country, half-tuned and low. Coffee pours long into the mug and the pot returns to the burner. Their voices sit close-miked and low, almost under the room. The pie case motor ticks each rotation like a slow clock. A semi passes on the wet highway, rising and falling away. The bell over the door rings once when she leaves. Keys, then the deadbolt, then the neon cutting out with a click. No score anywhere; the compressor is the last sound over black.12 13GRADE — Warm tungsten interior against cool blue night, gently faded. Skin tones amber, the whites of the apron allowed to go cream. Neon red given a soft bloom without ever clipping to pink. Shadows lean brown rather than black, like an old print. Faint halation on the practicals, in the way of pushed film. Grain fine but present, heavier in the blue window areas. The pie case fluorescent stays slightly green, uncorrected. Rain highlights on the glass kept specular and tight. Contrast eases up gently for the final exterior wide. The last frame cools as the interior warmth shuts off.
open on canvas

E15·2 — the same ladder written five ways (50 takes). Animation beat list (61–70), screenplay (71–80), timecode blocks (81–90), shot list (91–100), plain prose (101–110). Different films, same climb.

01E15-L-10 · prose · ~4116 chars10s · 21:9
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1An office throws a birthday party with the wrong name on the cake. The planner sees it first and puts her body between cake and room. Her whisper-fight with the intern happens entirely behind balloons. The song starts too early and cannot legally be stopped. Mid-song, the honoree reads the icing and his smile freezes solid. A manager attempts a rescue toast that makes everything worse. The intern goes to work on the icing with a plastic knife. A trick candle relights twice and nobody names the omen. Cake is served into a silence broken by one loud yum. At the end, the honoree sincerely thanks the room for Gary's party. It all happens in a beige break room dressed with three sad balloons. A banner droops at one corner over the fridge. The cake holds the table's centre: white icing, blue script, wrong name. Napkins fan beside plastic forks standing in a cup. Fluorescents hum over carpet tiles in two shades of grey. The good conference chair has been wheeled in as a throne. A whiteboard still shows last week's sales funnel. The window gives onto a parking structure and one brave tree. A diet soda sweats a ring beside the cake board. The microwave clock and the wall clock disagree by nine minutes. The honoree is a mild man in a checked shirt, turning fifty today. The planner runs the room like a crisis command post. The intern is twenty-two and visibly rehearsing apologies. The manager carries the confidence of a man about to make it worse. A dozen coworkers arrange themselves between cake and exits. One woman films everything on her phone for no stated reason. HR stands at the back, sipping, saying absolutely nothing. The honoree's glasses catch the fluorescents when he blinks. The planner's smile and her eyes run two different meetings. Everyone present will describe this day differently, and wrongly. The planner tells the camera that everything is completely under control. The intern insists they said Gary on the phone, twice. The manager toasts a man who needs no introduction — Gary. The honoree corrects him — it's Doug — and the toast pivots without shame. Someone in the back asks who Gary is; someone answers: exactly. The planner hisses to scrape faster; the intern notes it is fondant. The honoree assures the camera that fifty is fine, twice. HR wants it noted, for the record, that they ordered nothing. A speech is demanded; the honoree begs, quietly, for no. Alone with the camera, the intern asks if this job is forever. It is shot like a documentary that got lucky: handheld, late zooms. The light is flat office fluorescent with no cinematic help. Push-ins hunt reactions: the freeze, the wince, the sip. Talking heads sit against the beige wall between scenes. The cake gets loving product close-ups it does not deserve. One slow zoom crosses the doorway during the whisper-fight. Whip-pans connect the song and the scraping knife. HR haunts the frame edge like a Greek chorus. Once, from outside the window, the party plays as a terrarium. The final image is a locked extreme close-up of the ruined name. The soundtrack is room tone: fluorescent hum, fridge, distant phones. The song arrives ragged and in two different keys. Whispers meant to be private land hot on the boom. The fondant scrape is horribly, perfectly audible. A party horn deflates somewhere off camera. Forks click on paper plates in the silence. The trick candle's reignitions get their own tiny foley. There is no score; the comedy is dry and unassisted. The microwave beeps four times inside the manager's toast. Under the last shot, one air vent whistles a thin note. The grade is flat corporate daylight, true to the fluorescents. Beige sits on beige; colour management by facilities. Skin stays honest, shiny foreheads and all. The cake's white icing is the brightest object by far. A slight video sharpness reads broadcast, not cinema. The balloons' red is the only cheerful pixel. Interviews run a half-stop darker, accidentally moody. No grain, no halation, no mercy. The exterior shot cools to grey around the warm sad party. The final close-up is clinical, evidence-photo neutral.
open on canvas

E15·3 — the ladder shot vertical (19 takes). A deckhand's phone clip of a haul (111–119) and a night-market wok stall written as bare comma-separated tags (120–129).

04E15-A-03 · ~1440 chars15s · 21:9
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1ACTION — A dancer performs an audition solo and is stopped forty seconds in. She is mid-phrase when a voice from the dark tells her to stop. She holds the position she was stopped in rather than dropping out of it.2 3SETTING — A bare rehearsal studio with a sprung floor and a wall of mirrors. Fluorescent tubes overhead, half of them switched off. A folding table at the far end with three chairs behind it.4 5SUBJECT — A dancer in her early twenties, compact and very strong through the back. Dark hair pulled into a bun that has already started to come loose. Practice clothes: black leotard, grey tights with a hole at one knee.6 7DIALOGUE — A voice from behind the table says: "Stop. Thank you." She says: "Sorry — do you want it from the top?" The voice says: "Do it again. Same thing." Nothing else.8 9CAMERA & LIGHT — One locked-off wide on a 35mm from behind the table, static throughout. Overhead fluorescents only — flat, green-tinged, no shaping, no fill. The mirrors double her, so the frame holds two of her at all times.10 11SOUND & MUSIC — A tinny phone speaker plays the audition track from the floor. The track is a solo piano piece, mid-tempo, slightly too quiet for the room. Bare feet on sprung floor: a hollow thud with a faint resonance after it.12 13GRADE — Flat, cool, unflattering fluorescent white. Slightly green in the midtones, the way rehearsal rooms actually look. Skin allowed to go sallow rather than corrected warm.
open on canvas

The ladder is genuinely additive, and we checked rather than assumed: every sentence at rung k reappears verbatim at rung k+1 in all thirteen ladders. In E15·1 the structure is exact — rung k is the previous prompt plus exactly one more sentence under each of the seven headings. Rung 1 gives each heading one sentence. Rung 10 gives it ten.

The board's note says nothing new is ever added, only more about what's already there. That's true of the headings — all seven are populated at 500 characters — and false of the film. In the dancer ladder, rung 5 (n 5, 2,352) is the first to say "Cut once, at the stop, to an 85mm close from the same side", which contradicts rung 1's "One locked-off wide on a 35mm from behind the table, static throughout." Rung 6 (n 6, 2,804) introduces a second person at the table: "A second voice, further from the microphone, says: 'Thank you.'" In the wok ladder a daughter appears at rung 3 (n 122, 1,151) and rain at rung 7 (n 126, 2,568). In the diner, the cook gets a name — Ray — only at rung 10 (n 30, 4,359). Above about rung 4 you are not describing the same film harder. You are commissioning a bigger one, and that explains most of what goes wrong at the top.

One more caveat, because it confounds E15·1: clip length was not held constant there. Rungs 1–2 came back at 10s, rung 3 at 15s, rungs 4–10 at 20s in five of the six ladders. E15·2 and E15·3 are pinned at 10s at every rung, so those are the clean comparisons. Every conclusion below is checked against them.

What happened

It reads to the end. All of it. The strongest evidence is the office-birthday ladder, written as prose. The last sentence ever added — appearing only at rung 10, n 110, 4,110 characters — is "The final image is a locked extreme close-up of the ruined name." The final frame of n 110, at 9.7s, is a locked extreme close-up of a white sheet cake reading GARY with the G scraped through. One rung down, n 109's newly-added camera line is "Once, from outside the window, the party plays as a terrarium" — and n 109 ends, at 9.6s, on an exterior shot through office glass with the party silent inside it. Both films then obeyed a sentence buried 3,600+ characters deep. There is no cut-off at 1,000 characters, or 2,000. Nothing in 129 takes suggests the model stops listening.

The gain is front-loaded, and it's front-loaded hard. At 523 characters, n 1 is a dancer alone in an empty studio — accurate and inert. At 1,434 (n 3) the prompt has added "A folding table at the far end with three chairs behind it" and "The mirrors double her, so the frame holds two of her at all times" — and n 3 at 11.3s has the folding table, the three empty chairs, and her reflection working alongside her. That's not more detail. That's the scene: someone is judging her. Same story in the diner. n 21 (509) is a cook alone at a griddle. n 23 (1,349) adds "The regular at the counter watches him work and says nothing", "The customer is a night-shift nurse still in her scrubs", and "A hand-lettered sign in the window reads: CLOSING — THANK YOU" — all three are on screen by 2.5s. Rungs 1 to 3, roughly 500 to 1,400 characters, is where a description becomes a film.

02E15-C-03 · ~1355 chars20s · 21:9
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1ACTION — A short-order cook makes one last meal on the diner's final night. He scrapes the flat-top clean before laying the eggs down. The regular at the counter watches him work and says nothing.2 3SETTING — An all-night diner on the edge of a state highway, nearly empty. A long counter with chrome stools, two of them patched with tape. A hand-lettered sign in the window reads: CLOSING — THANK YOU.4 5SUBJECT — A cook in his sixties, forearms scarred with old griddle burns. White tee, white apron gone grey, a paper hat he still bothers with. The customer is a night-shift nurse still in her scrubs.6 7DIALOGUE — He says: "Kitchen's closed. Sit down anyway." She says: "You know I only came for the coffee." He says: "Then the eggs are on the house."8 9CAMERA & LIGHT — One slow dolly along the counter at seated eye height, 40mm. Warm tungsten practicals inside against blue rain-dark windows. The pass light throws a hard warm rectangle across the flat-top.10 11SOUND & MUSIC — Rain on glass, a compressor hum, eggs hitting the hot flat-top. The scrape of the spatula comes in long, practiced strokes. A radio in the kitchen plays AM country, half-tuned and low.12 13GRADE — Warm tungsten interior against cool blue night, gently faded. Skin tones amber, the whites of the apron allowed to go cream. Neon red given a soft bloom without ever clipping to pink.
open on canvas

Past about 2,400 characters the additions are texture. Look at what the top rungs actually contribute. The dancer's rung 9 additions include "Old strapping tape residue, grey and fuzzy, still on the other ankle" (rung 10), "Mirrors read very slightly cooler than the room they reflect" (rung 7), and "No vignette, no film emulation, nothing that flatters the room" (rung 10). The model honours them — n 9 at 15s has the piano from rung 5, the radiator from rung 6, the water bottles along the skirting from rung 8, the two-colour tape marks from rung 4, and exactly three heads at the table as specified. It is an impressively obedient frame. It is also not a better film than n 3. It is the same film with more objects in it.

What genuinely gets worse: the cutting. The prompt outgrows the runtime, and FLUX.3 resolves the overflow by cutting more. In the dancer ladder, rung 1 is 8 sentences across 20 seconds — 0.4 instructions per second. Rung 10 is 80 sentences and 12 lines of dialogue across the same 20 seconds — 4.0 per second. The prose ladder is worse: 70 sentences into 10 seconds, 7.0 per second. Measured shot counts follow. Across the six E15·1 films, the rung-1 take is a single unbroken shot in five of six; the rung-10 take runs to three or more shots in four of six — the chess ladder ends at nine (n 50), the pit stop at seven (n 20). In the prose ladder, where every take is pinned at 10s, shots climb 2 → 9 (n 101 → n 110): nine shots in ten seconds, about 1.1s each. Nothing is held. The 4,110-character version of a joke plays as a trailer for itself.

Format decides the edit; length doesn't. This is the most useful thing in E15·2, and it is a clean result because every take there is 10 seconds. Written as timecode blocks, the film came back as exactly one continuous shot at every single rung, 517 characters through 3,947 (n 81–90). Written as a shot list, it came back as 3–5 shots at every rung (n 91–100) — and at the halfway mark, all ten rungs are showing the same SHOT 3, the overhead down the lighthouse spiral. Written as prose, cuts multiply with length (2 → 9). Three ladders, same length axis, three completely different structural responses. If you care how many cuts you get, change the format, not the word count.

Vertical behaves the same, with one extra lesson about words on screen. In the deckhand ladder, rung 4 (n 114, 1,700) is the first to ask for "Bold white captions with a slight drop shadow, upper third" — with no caption text supplied. The model invented its own: n 114 reads DAWN HAUL, n 115 reads STAND CLEAR. At rung 7 (n 117, 2,798) the prompt finally supplies text — "caption lands: BIGGEST BAG ALL SEASON" — and n 117, n 118 and n 119 all burn in BIGGEST BAG ALL SEASON verbatim. Ask for captions and you get the model's words. Write the words and you get your words.

The null result, stated plainly. Between rung 5 and rung 10 — 2,352 to 4,665 characters, more than doubling the prompt — the frames do not get better. They get busier, they cut more, and specific requested objects reliably appear. On a contact sheet you cannot rank them. If prompt length were the lever people assume it is, the right-hand column of every row would win. It doesn't.

Notable takes

110 | The ruined name | 4,110 characters, and the last frame is exactly what the last sentence of the prompt asked for. 23 | The diner, at 1,349 | Cook, nurse, CLOSING — THANK YOU sign. The whole scene, for a quarter of the words. 3 | The table arrives | 1,434 characters. Three empty chairs turn a dancer into an audition. 30 | The full 4,359 | Locks the door, turns the sign, kills the neon — proof the top rung can pay off when the film is genuinely bigger. 95 | Shot list, rung 5 | At the halfway mark it is showing the same overhead spiral as rungs 1 and 10. Only the grade moved. 117 | BIGGEST BAG ALL SEASON | Supply the caption text and it renders verbatim; three rungs earlier it made up its own.

05E15-H-07 · 9:16 · ~2804 chars10s · 9:16
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10:00–0:02 — A young deckhand's phone clip opens on a heaving trawler deck at dawn. He films one-handed, other arm hooked through the rigging. The winch starts and the cable snaps taut out of frame. Spray hits the lens and leaves running droplets. The camera lurches with the boat; the horizon swings past vertical. His hood fills half the frame, orange and streaming. Deck lights flare white streaks across the wet lens. 0:02–0:04 — The net breaks the surface below and the crew roar goes up. He leans the phone over the rail to catch the boiling water. A swell shoulders the boat and the frame drops half a metre. Green water sweeps the deck across the bottom of the shot. He whoops, and the wind rips the sound to pieces. The winch screams somewhere above the frame. Gulls flash through the top of the vertical frame. 0:04–0:06 — The cod end swings inboard overhead, huge and streaming. He tilts the phone straight up to fit it in the vertical frame. It blots out the deck lights and rains on the lens. The mesh bulges silver with the weight of the catch. Someone yells to stand clear and he backs up fast, still filming. The frame clips the skipper watching from the wheelhouse door. A caption lands: BIGGEST BAG ALL SEASON. 0:06–0:08 — The catch releases and fish flood the deck pound in a silver wave. The phone nearly goes down with him as his boots skate. He catches the rail, laughing, camera swinging past his knees. Fish slap around his ankles across the bottom of the frame. The crew wade in with gloves already moving. A caption stutters on: I'M FINE LOL. The eldest deckhand deadpans straight into the lens. 0:08–0:10 — He flips the camera to selfie, soaked and grinning ear to ear. Behind him the crew cheer and hold up two fish like trophies. The dawn splits grey-gold along the horizon over his shoulder. He shouts: season's done, we're going home. The skipper leans out of the wheelhouse and finally smiles. Spray beads roll down the lens through the whole shot. A caption settles: 127 DAYS. DONE.2 3STYLE — Vertical 9:16 phone footage, handheld, ultra-wide GoPro feel. Water droplets and smears live on the lens the whole clip. Auto-exposure hunts between deck lights and the dark sea. Bold white captions with a slight drop shadow, upper third. Digital stabilisation warps the edges on the big hits. Colours raw and cold; oilskin orange burns against the grey. Occasional dropped frames when spray smacks the camera.4 5SOUND — Wind hammers the phone mic into crackle on every gust. The winch and diesel grind underneath everything. His whoops distort, clipped by the tiny mic. The catch lands as a roaring drum of fish on aluminium. Crew voices come through in salty half-heard fragments. Gulls shriek somewhere above the frame. A muffled thump and laughter when he nearly goes down.
open on canvas

What this means if you're prompting FLUX.3

Write about 1,400 characters. That's roughly three sentences on each of action, setting, subject, dialogue, camera, sound and grade. It is where a description turns into a scene, and it is where the returns flatten.

Spend those characters on who is watching, what's on the sign, and what's in the frame besides the subject — the facts that change what the shot means. Not on "mirrors read very slightly cooler than the room they reflect." That line was obeyed and nobody will ever see it.

If you write past 2,400, do it because the film is actually bigger — a second character, an exterior, a cut — not to describe the same film harder. Then check the runtime: 70 instructions in 10 seconds gets you nine shots and no time to look at any of them.

Pick your format for the edit you want. Timecode blocks gave one unbroken take at every length tested. A shot list gave 3–5 shots at every length. Prose let the cuts multiply with the word count. That lever is far stronger than length.

Write the on-screen words out. "Captions, upper third" gets you the model's copy. caption: BIGGEST BAG ALL SEASON gets you yours.

06E15-K-05 · shotlist · ~2065 chars10s · 21:9
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1SHOT 1 — Wide: a lighthouse on a bare rock, sea on all sides, fog closing in. Static tripod, 32mm, the tower centred and small against the murk. The beam sweeps a bright bar through the fog every five seconds. Hold the frame long enough that the sea starts to feel patient. No movement but water, beam and fog; the shot outwaits the viewer.2 3SHOT 2 — Interior mid-shot: the keeper winding the mechanism, methodical. A knock lands below — three beats, patient — and he stops. 50mm at chest height; he holds dead centre, hands stilled. He listens without breathing; the kettle steams behind him. The second knock arrives exactly as before, no louder.4 5SHOT 3 — Overhead down the spiral: his lantern descends into black. The whitewashed stairs coil like a shell below the camera. His shadow climbs the curved wall, huge and wrong-jointed. Iron steps ring under his boots, each note distinct. The lantern shakes only a little, and he watches it shake.6 7SHOT 4 — Close on the iron door handle, lantern light from off frame. He asks who is there; the fog outside says nothing. The handle turns once, slowly, and returns to rest. Macro patience: thread of rust, old paint, his reflection warped. His hand enters frame, hovers over the bolt, and withdraws.8 9SHOT 5 — Lamp room: he looks down as the sweep shows the rock ledge empty. His reflection stands beside him in the black glass. The beam strobes the room: light, dark, light, dark. Wide enough to hold the window behind his shoulder. He exhales; twenty-two years of rocks say it was wind.10 11SOUND — Sea on rock under everything, patient and enormous. The mechanism's clockwork tick fills the tower's spine. Three knocks, evenly spaced, neither loud nor gentle. The fog horn moans at long, irregular intervals. Held breath, then its release, mixed close.12 13GRADE — Cold slate blues and lamp-oil amber, nothing neutral. Fog flattens the exterior; the tower stays hard inside. Blacks absolute in the stairwell's centre. The beam burns clean white and leaves ghosts on the eye. Skin waxen in lantern light, warm but wrong.
open on canvas

Every take above is straight out of the model — nothing cut, graded or retouched — and every prompt is printed in full.

See every take on the board

All 129 from this report, plus the rest of the run.