A whole story in 150 words: every AI model's reply, tested

Write a short story from this idea, with a title on the first line. Keep every name and detail in it, and give it a real ending. Keep it to about 150 words.

---
A time traveller named Otto has exactly one minute in the year 1900 to change one thing.

How the AI story generator's test inputs are scored, with every model's results on all five.

1. GPT-6 Luna

   Failed: Graded 3.7 of 5 on average (lowest 3).

   The Minute in 1900
   
   Otto landed beside a red postbox, his watch already counting down: sixty seconds.
   
   In his coat was a letter addressed to a woman who, in Otto’s own time, had died believing her brother had forgotten her. The brother had written it in 1900, then lost his nerve.
   
   Across the street, Otto spotted him: a young man clutching an envelope, turning toward a stove.
   
   “Don’t,” Otto called.
   
   The man froze. “Who are you?”
   
   Otto snatched the letter from his hand and slipped it into the postbox. One thing changed. The clock showed ten seconds.
   
   The young man stared at the box, then laughed—not because it was funny, but because the choice was made.
   
   Otto’s watch chimed. The street blurred.
   
   He landed in his own time, where a family portrait hung in the station: the woman and her brother, old and smiling, arms linked.
   
   Otto touched the glass. Then, beneath the portrait, he saw a new plaque:
   
   “Some letters arrive just in time.”

   344 tokens in, 451 out (225 of them reasoning) · 5.0 s · $0.0001 · 1 message on Pro · answered by openai/gpt-6-luna via OpenAI · September 28, 2026

2. Claude Haiku 5.5

   Failed: Graded 3.7 of 5 on average (lowest 3).

   The Minute Before the Train
   
   Otto checked his pocket watch for the third time. Fifty-one seconds left in the year 1900, and the street outside the hotel was thick with horse carts and damp coats.
   
   He had come to fix one thing: the letter his grandmother never sent. It was tucked inside a book on the reading table, addressed to a man who would have welcomed her home.
   
   "Sir, you cannot stay in that doorway," a porter said.
   
   "Forty seconds," Otto muttered. He pulled the letter free, ran his thumb over the seal, and tore it open. Blank paper. He had been wrong about which copy mattered.
   
   He scribbled his own words in a hurry: Come home. Everything is forgiven. He pressed it into the book.
   
   Ten seconds. The bells of the nearby church began to ring.
   
   Otto closed his eyes and let the watch go still. When he opened them, the room was quiet, the porter was gone, and a woman in a grey dress was sitting by the window, reading the letter aloud, weeping and smiling at once.

   451 tokens in, 341 out · 3.2 s · $0.0002 · 1 message on Pro · answered by anthropic/claude-haiku-5.5 via Anthropic · October 7, 2026

3. Claude Sonnet 5.5

   Failed: Graded 4.3 of 5 on average (lowest 4); but missing "1900".

   The Minute at the Clockmaker's
   
   Otto landed in a Vienna alley at 3:14 p.m., and his wrist counter began to bleed seconds. Sixty. He ran.
   
   The clockmaker's shop bell jangled. An old man looked up from his bench. "Yes?"
   
   "Your tower clock," Otto gasped. "The one you're delivering tomorrow. The mainspring is flawed. It will fail in a year, and the town square will stop at the wrong hour and..." He stopped. He hadn't rehearsed the rest. Forty seconds.
   
   "And?"
   
   "And nothing. People will be late. A train missed. One small thing, but it becomes another."
   
   The clockmaker laughed, then saw Otto's face. He lifted the spring, held it to the window, and frowned at a hairline crack. "Well. I'll be damned."
   
   Twenty seconds. Otto backed toward the door.
   
   "Who are you?"
   
   "Someone who was late once," Otto said.
   
   The bell jangled. The counter hit zero, and the alley folded away.
   
   Home again, Otto's watch read 3:14 exactly. Across the street, the tower clock kept perfect time, and his daughter was waving from the platform.

   451 tokens in, 396 out · 4.9 s · $0.0049 · 1 message on Pro · answered by anthropic/claude-sonnet-5.5 via Anthropic · September 28, 2026

4. Mistral Large 4

   Failed: Graded 3.7 of 5 on average (lowest 3).

   The Sixty Seconds
   
   Time traveller Otto stepped onto the cobblestones of 1900 and started his watch. Exactly one minute to change one thing.
   
   A street vendor pushed a cart past, crying, "Fresh bread, warm rolls!" Otto saw a young girl—maybe ten—standing outside a bakery, clutching an empty purse. She watched a horse-drawn carriage pass, eyes fixed on the brass bell that swung from its harness.
   
   Otto moved. He knelt, pressed the bell into her small hand. "Keep it," he said, though his chronometer ticked 45... 40... 35...
   
   The girl looked up, astonished. "But I can't pay you."
   
   "Payment enough," Otto said, rising as the clock struck zero. The machine's hum pulled at his waistcoat.
   
   He returned to 2024 to find a photograph on his desk: the girl, ancient now, smiling beside a brass bell in a museum case. Beneath it, a plaque read: "Donated by Clara Whitmore, who never forgot kindness."
   
   The carriage still passed, but she kept the bell.

   348 tokens in, 3,072 out (2,823 of them reasoning) · 22.9 s · $0.0067 · 1 message on Pro · answered by mistralai/mistral-large-4-0 via Mistral · October 9, 2026

5. GLM 5.3 Flash

   Passed: Graded 4.7 of 5 on average (lowest 4).

   One Minute in 1900
   
   Otto stepped out of the machine into a Paris street, the dial counting down: sixty seconds.
   
   His instructions were cruelly simple—one change, one minute, no more.
   
   He spotted her at a flower cart: Grandmother Elise, nineteen, about to board the tram that would crash. Fifty seconds.
   
   "Mademoiselle!" He ran, but a cobblestone caught his boot. Forty seconds. He stumbled forward, palms scraping.
   
   Thirty seconds. A street magician nearby gasped as his doves escaped, fluttering chaos. Otto grabbed one white bird. Twenty seconds.
   
   He pressed it into Elise's arms. "A gift. Stay for the show—the magician needs an assistant. Trust me."
   
   She laughed, delight replacing hurry, and turned toward the square. Ten seconds. The tram rattled past, empty seat where she would have sat.
   
   Five. One.
   
   Otto faded back to the machine, grinning. His own birthday photograph now showed a woman holding a dove.

   354 tokens in, 210 out · 12.7 s · $0.0002 · 1 message on Pro · answered by z-ai/glm-5.3-flash via Parasail · September 28, 2026

6. DeepSeek V4.1 Flash

   Passed: Graded 4.7 of 5 on average (lowest 4).

   Otto's Minute
   
   The watch buzzed once against Otto's wrist: sixty seconds. Paris, 1900, the World's Fair. Bells, steam, the smell of hot metal.
   
   He had come for one thing, one move, one person: a glassblower named Élise Marchand, whose lamp chimney had cracked that morning. Otto had read the histories. In his own year, her workshop was a parking garage.
   
   "There." He found her behind a stall, frowning at the crack.
   
   "Take this," he said, and pressed a brass collar into her hand. "It holds. It lasts."
   
   She looked at him strangely, then fit it on the chimney. The lamp burned steady and bright.
   
   The watch buzzed three times. Otto stepped back into the crowd and vanished.
   
   In his own year, the workshop still stood. Above the door, in faded paint: Marchand et Fils, Éclairage depuis 1900.

   372 tokens in, 245 out (47 of them reasoning) · 1.6 s · $0.0003 · 1 message on Pro · answered by deepseek/deepseek-v4.1-flash via Together · October 8, 2026

7. GLM 5.3

   Passed: Graded 4.3 of 5 on average (lowest 4).

   The Minute in 1900
   
   Otto materialized beside a cobblestone street, brass pocket watch glowing in his palm. One minute.
   
   Across the road, a young woman named Eliza Marsh argued with a stationmaster, her suitcase abandoned on the platform. "The Vienna scholarship," she was insisting. "The letter arrived a day late. Please."
   
   The stationmaster shrugged. "Train's gone, miss."
   
   Otto sprinted, breath steaming in the cold. Twenty-five seconds. He snatched the letter from her hand, then slapped it onto the ticket counter, date side up.
   
   "Look at the postmark," he said. "It was posted Monday. Your post office held it."
   
   The stationmaster squinted. "That's... true, actually."
   
   "Fifteen seconds," the watch hissed.
   
   He pressed a coin onto the counter. "Wire Vienna. Tell them Miss Marsh arrives tomorrow."
   
   Eliza stared at him. "Who are you?"
   
   "Someone who read your physics textbook," Otto said. "Twice. It's very good."
   
   The watch flared. Ten seconds.
   
   "Go pack," he told her.
   
   She ran, laughing, for her suitcase.
   
   Otto vanished — and the platform filled, forty years later, with crowds cheering for a gray-haired woman stepping off a train, home from Stockholm, a medal in her bag.

   354 tokens in, 281 out · 3.1 s · $0.0012 · 1 message on Pro · answered by z-ai/glm-5.3 via Friendli · September 28, 2026

8. GPT-6.1 Sol

   Passed: Graded 4.7 of 5 on average (lowest 4).

   The Minute Hand
   
   Otto landed in the year 1900 with exactly one minute to change one thing.
   
   Across the railway platform, a girl in a yellow coat stood beside a battered trunk. In his pocket lay the photograph he’d carried through forty years of research: that same girl, his grandmother, beneath the obituary announcing her father’s disappearance.
   
   Fifty seconds.
   
   A man hurried toward the departing train. Otto recognized the crooked nose from family portraits.
   
   “Wait!” Otto shouted.
   
   The man kept walking.
   
   Thirty seconds.
   
   Otto could break the signal, block the locomotive, invent a warning. But his machine permitted one change, and he’d chosen what to bring.
   
   He thrust a small envelope into the man’s hand.
   
   Inside was the photograph.
   
   The man stared at the obituary, then turned toward the girl.
   
   “Elsie?”
   
   She ran to him.
   
   Otto vanished as the train pulled away.
   
   At home, the obituary was gone.
   
   The photograph remained. Now her father stood beside her.

   344 tokens in, 205 out · 4.8 s · $0.0014 · 1 message on Pro · answered by openai/gpt-6.1-sol via OpenAI · September 29, 2026

9. Claude Haiku 4.5

   Passed: Graded 4.7 of 5 on average (lowest 4).

   Otto's Minute
   
   Otto materialized in a London street on January 1st, 1900, his chronometer already ticking. Sixty seconds. He clutched the letter in his trembling hand.
   
   A young woman in a grey coat hurried past, head down against the cold. Otto recognized her from the archives: Margaret Ashworth, who would become a factory owner's wife, silent and small, her own inventions forgotten.
   
   "Miss Ashworth!" he called.
   
   She turned, startled. Forty-five seconds left.
   
   Otto pressed the letter into her hands. "Read it. When you're alone."
   
   "Who are you?"
   
   "Someone from tomorrow. You have a gift. Don't let anyone convince you otherwise."
   
   Her fingers closed around the paper. Thirty seconds.
   
   "I don't understand," she whispered.
   
   "You will."
   
   Otto's device hummed. The world dissolved into light.
   
   In 2087, the history files updated. Margaret Ashworth, engineer. Her differential engine had changed everything. Somewhere in the archive, a letter yellowed in preservation: one minute that rewrote the future.

   363 tokens in, 251 out · 4.0 s · $0.0016 · 1 message on Pro · answered by anthropic/claude-haiku-4.5 via Anthropic · September 28, 2026

10. Gemini 4 Argon

    Passed: Graded 4.7 of 5 on average (lowest 4).

    Sixty Seconds in 1900
    
    Otto materialized in a cobblestone alley, his wrist chronometer already blinking red: 00:59. Around him, the year 1900 hummed with the clatter of horse-drawn hansoms and coal smoke. 
    
    He sprinted onto the gaslit street. At the corner stood a young inventor, Arthur, holding a brass valve over a storm drain. In Otto's history, Arthur tossed that faulty prototype away, gave up engineering, and left the world stagnant for a century.
    
    "Wait!" Otto gasped, skidding to a halt. 00:34. 
    
    Arthur blinked, startled, his fingers loosening over the grate. "It is useless. It leaks pressure."
    
    "Turn the inner ring left, not right," Otto said, grabbing the brass cylinder. He twisted the mechanism until it clicked tight, then pressed a copper seal from his pocket onto the joint. "Watch."
    
    He pumped the lever. The valve hissed, holding steady. 00:11.
    
    Arthur’s eyes widened. "It holds! Who are you?"
    
    "A fan," Otto smiled, fading into blue sparks as his timer hit zero.
    
    Otto snapped back to his present. Outside his laboratory window, the grey smog was gone, replaced by gleaming brass airships gliding silently across a crystal sky.

    394 tokens in, 289 out · 6.9 s · $0.0018 · 1 message on Pro · answered by google/gemini-4-argon via Google AI Studio · October 15, 2026

11. Gemini 3.8 Flash

    Passed: Graded 4.0 of 5 on average (lowest 3).

    The Sixty-Second Rescue
    
    Otto materialized in an alleyway in the year 1900, the crisp air thick with coal smoke. The counter on his sleeve began a relentless countdown: sixty seconds. He was a time traveller with one minute to change a single tragic moment.
    
    He bolted toward the corner telegraph office. His family history carried one disaster: a misprinted message sent at noon that sparked a feud lasting generations.
    
    With twenty seconds remaining, Otto slammed through the heavy oak door. The clerk sat poised to tap the fateful key.
    
    Otto drew breath to shout, but a spark from the hearth caught the edge of the clerk's drapes, licking upward toward a shelf of kerosene bottles. The man had not noticed.
    
    Stopping the message meant nothing if they both burned. Otto lunged, tore the fabric down, and smothered the flame with his heavy coat.
    
    "What are you doing?" the clerk gasped, leaping clear of the desk.
    
    The timer struck zero. The vortex yanked Otto backward, leaving the office intact and the telegram unsent forever.

    361 tokens in, 1,226 out (1,006 of them reasoning) · 8.0 s · $0.0024 · 1 message on Pro · answered by google/gemini-3.8-flash via Google AI Studio · September 28, 2026

12. Kimi K3

    Passed: Graded 4.3 of 5 on average (lowest 4).

    Otto's Sixty Seconds
    
    The machine dropped Otto in a Vienna alley, dawn, January 1st, 1900. His wrist counter blinked: 60.
    
    He ran. Fifty-nine. A flower seller was setting up her cart, humming. Otto skidded to her side.
    
    "Madam, do you know a boy? Ten years old, paints postcards, lives above the tobacconist?"
    
    She frowned. "Adolf? Poor lamb, he's feverish. His mother can't afford the doctor."
    
    Forty seconds. Otto pressed every coin from every century into her hand. "Get the doctor. Not for him. For her. Tell her the world will need her kindness, and she must stay alive to give it."
    
    Twenty seconds. She stared at the strange money. "Who are you?"
    
    "Nobody," Otto said. "Just someone who ran out of time."
    
    Five. He sprinted back to the alley. One.
    
    The machine seized him home. He opened a history book with shaking hands. The pages had changed. Not the way he'd planned. But the flower seller had kept her promise, and a grieving boy had grown up loved, and painted postcards all his life.
    
    Sixty seconds was enough, if you spent them on the right person.

    431 tokens in, 303 out (31 of them reasoning) · 11.7 s · $0.0029 · 1 message on Pro · answered by moonshotai/kimi-k3 via Wafer · September 28, 2026

13. Grok 4.7

    Passed: Graded 4.0 of 5 on average (lowest 3).

    The Minute Otto Kept
    
    Otto landed on a wet cobblestone street in 1900 with sixty seconds on his wristwatch and one change allowed. A boy tugged a cart toward the crossing as a horse-drawn omnibus swung wide.
    
    "Stop!" Otto shouted, but the driver could not hear him over the wheels.
    
    Forty seconds. He had come to save a letter that would start a war, yet the boy was already under the horse's shadow. Otto lunged, grabbed the cart handle, and hauled both of them back onto the curb.
    
    Twenty seconds. The omnibus thundered past. The boy stared up, muddy and breathing hard.
    
    "Who are you?" he asked.
    
    "Someone who had one minute," Otto said. His watch hit zero.
    
    The street blurred. He woke in his own year with the letter still unsent in history books, and a name he had never seen before written in the margin of a rescued census: the boy had lived, and later built the bridge Otto crossed every morning. Otto touched the stone rail and smiled. One change had been enough.

    1,578 tokens in, 310 out (90 of them reasoning) · 6.9 s · $0.0033 · 1 message on Pro · answered by x-ai/grok-4.7 via xAI · October 2, 2026

14. GPT-6 Sol

    Passed: Graded 4.7 of 5 on average (lowest 4).

    The Door in 1900
    
    Otto arrived in the year 1900 with exactly one minute to change one thing.
    
    He stood inside a textile mill, beside the oil lamp he had come to extinguish. In the history books, its fall had started a fire. He reached for it.
    
    “Sir?” A girl carrying a basket of thread pointed toward the far wall. “Why is that door bolted?”
    
    Otto looked from the lamp to the heavy iron bar. Forty seconds.
    
    He could not do both. He ran to the door, heaved the bar free, and dropped it. Behind him, someone shouted. The lamp struck the floor.
    
    “Outside!” Otto called.
    
    Workers poured through the open door. The girl caught a younger boy by the hand and pulled him along. As Otto stepped aside for them, his minute ended.
    
    He returned to find the fire still recorded in the history book. Beneath the date was a sentence that had not been there before: Everyone escaped.

    344 tokens in, 696 out (489 of them reasoning) · 9.1 s · $0.0038 · 1 message on Pro · answered by openai/gpt-6-sol via OpenAI · September 28, 2026

15. DeepSeek V4 Pro

    Passed: Graded 4.3 of 5 on average (lowest 4).

    Otto's Minute
    
    Otto landed in a muddy alley in 1900. His brass timer showed sixty seconds. Exactly one minute to change one thing. A factory whistle split the air. Down the road, a newsboy shouted about a dock fire. Otto had planned to kick a loose brick from the cart path, delaying a milk wagon and saving a man who would one day invent a vaccine.
    
    But then he saw a small girl reach for a coin in the gutter as a steam lorry rumbled around the corner.
    
    Forty seconds. The girl's mother screamed from a doorway. Otto sprinted. He could change one thing. He chose the girl. He scooped her up and set her on the step, his timer hitting zero.
    
    He vanished. The milk wagon hit the brick and tipped. The inventor broke his arm. The vaccine came twenty years late. But a little girl named Ada grew up, became a nurse, and saved three hundred people in a fever ward.
    
    Otto's minute changed one life, and that was enough.

    346 tokens in, 965 out (752 of them reasoning) · 7.6 s · $0.0039 · 1 message on Pro · answered by deepseek/deepseek-v4-pro-0813 via Wafer · October 8, 2026

16. Claude Sonnet 5

    Passed: Graded 4.3 of 5 on average (lowest 4).

    The Minute of 1900
    
    Otto's boots hit cobblestone with a hiss of ozone. One minute. That was all the machine could hold in 1900 before it yanked him back.
    
    He'd rehearsed this a hundred times: find the letter, burn it, prevent the war that would come. But the street was wrong—wrong shop signs, wrong faces. Forty seconds left.
    
    A boy chased a hoop past him, laughing. An old woman dropped her basket of apples. Otto knelt, gathered them, pressed them into her arms. She blinked at his strange coat and said, "Bless you, stranger."
    
    Twenty seconds. He never found the letter. Ten seconds. The boy caught his hoop and grinned at Otto like they shared a secret.
    
    The machine seized him back into white light.
    
    Otto never learned what changed. But somewhere, an old woman told her grandchildren about a strange kind man, and that story outlived every letter he might have burned.

    449 tokens in, 324 out (15 of them reasoning) · 5.9 s · $0.0041 · 1 message on Pro · answered by anthropic/claude-sonnet-5 via Anthropic · September 28, 2026

17. GPT-6 Astra

    Passed: Graded 4.7 of 5 on average (lowest 4).

    The Minute Hand
    
    Otto landed in the year 1900 with sixty seconds glowing on his wrist.
    
    He could change one thing. After that, history would harden around him and send him home.
    
    Across the street, a clockmaker was locking his shop. Beside the door stood a little girl holding a broken pocket watch.
    
    “Tomorrow,” the clockmaker said.
    
    Otto knew that watch. It sat beneath glass in his own century, beside a photograph of the girl who had become his grandmother. She had never heard her father’s last message, hidden inside its case.
    
    Forty seconds.
    
    “Please,” Otto told the clockmaker. “Open it.”
    
    “Come back tomorrow.”
    
    Twenty seconds.
    
    Otto took the watch and pressed its stubborn catch against the doorframe. The lid sprang loose. A folded scrap fluttered out.
    
    The girl read it.
    
    “He wasn’t leaving us,” she whispered. “He wanted us to follow.”
    
    Otto vanished.
    
    At home, the museum photograph showed three people.
    
    He stayed until closing.

    344 tokens in, 213 out · 29.8 s · $0.0070 · 1 message on Pro · answered by openai/gpt-6-astra via OpenAI · September 28, 2026

18. Gemini 3.1 Pro

    Passed: Graded 4.3 of 5 on average (lowest 3).

    Sixty Seconds in 1900
    
    Otto materialized on a bustling cobblestone street in 1900, his pocket watch ticking loudly. He had exactly one minute to change one thing. 
    
    Fifty seconds. He pushed past women in heavy dresses and men in bowler hats, scanning the brick storefronts. 
    
    Thirty seconds. There it was, the red iron mail box. A young man stood before it, holding a sealed blue envelope. That single letter would ruin Otto's family for three generations. 
    
    Fifteen seconds. The young man extended his arm toward the brass slot. 
    
    Otto lunged. Pardon me, he yelled, slamming heavily into the man's shoulder. 
    
    The blue envelope slipped from the man's fingers, fluttering down into a deep, muddy street puddle. The man groaned, kneeling to retrieve the ruined, soaked paper. Shaking his head, he crumpled it up and walked away. 
    
    Two seconds. Otto smiled as the antique street dissolved into white light. When he opened his eyes in his own time, his family's dilapidated apartment had become a sprawling, sunlit mansion.

    361 tokens in, 1,346 out (1,112 of them reasoning) · 12.0 s · $0.0084 · 1 message on Pro · answered by google/gemini-3.1-pro-preview via Google AI Studio · September 28, 2026

19. Claude Opus 5.5

    Passed: Graded 4.7 of 5 on average (lowest 4).

    Sixty Seconds in 1900
    
    Otto landed in a muddy street as his wrist dial began its countdown: 0:59.
    
    He had rehearsed this for years. Find the clockmaker's shop. Stop the fire. Save the town.
    
    0:48. The shop stood untouched, its windows glowing. No smoke. His calculations were wrong.
    
    "Mister, you dropped this," said a small boy, holding out Otto's notebook.
    
    0:31. Otto looked past him. A tired lamplighter was stumbling toward the shop, lantern swinging, eyes half closed.
    
    "What's your name?" Otto asked.
    
    "Felix."
    
    0:19. Otto pressed the notebook back into the boy's hands. "Keep it. Now run and tell that man to put his lantern down. Hurry."
    
    Felix ran. The lamplighter blinked, yawned, and set the lantern safely on a stone step.
    
    0:03. The world folded.
    
    Otto woke in his laboratory. On the wall hung a photograph he had never seen: the clockmaker's shop, still standing, with a brass plaque reading "Felix & Sons, Since 1900."

    451 tokens in, 926 out (553 of them reasoning) · 10.6 s · $0.0203 · 1 message on Pro · answered by anthropic/claude-opus-5.5 via Google · September 28, 2026

20. Claude Fable 5.1

    Passed: Graded 4.7 of 5 on average (lowest 4).

    One Minute, Paris, 1900
    
    The machine spat Otto onto a cobbled street, and the wristband began counting down from sixty.
    
    He had rehearsed this for years. Turn left, twenty paces, the café where the young engineer would drop his notebook in the gutter and lose the design that might have made the century kinder.
    
    Fifty seconds.
    
    A boy stood in the road, staring up at a runaway cart horse thundering toward him. Nobody else had noticed yet.
    
    Otto froze. The notebook, or the boy.
    
    Thirty seconds.
    
    He ran the wrong way, seized the child by the collar, and hauled him onto the pavement as the cart crashed past.
    
    "Merci, monsieur," the boy gasped.
    
    Ten seconds. The café was too far now.
    
    "What's your name?" Otto asked.
    
    "Henri."
    
    The wristband flashed zero. Otto vanished.
    
    Back in the lab, the archive had changed. No famous notebook. But a new entry: Henri, engineer, 1900 to 1978.

    451 tokens in, 335 out · 7.0 s · $0.0213 · 1 message on Pro · answered by anthropic/claude-fable-5.1 via Google · September 28, 2026

• A mystery at the library
• The same first and last sentence
• Letters that come back
• A bedtime story
• AI story generator: try it free, and every model's results