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Claude Completes Kubla Khan With 10-Minute Literary Reasoning Trace

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Ethan Mollick@emollick#181inTech

Fable's attempt to complete Kublai Khan. Better, though no Coleridge: https://claude.ai/public/artifacts/d7d3351f-5ad5-4d73-a644-4a1426abe558

The most interesting thing is that it thought for 10 minutes & the thinking trace is full of pretty complicated (seeming?) musings about Coleridge's intent. A little literal, though.

Ethan Mollick@emollick

PorlockBench still unsaturated, but the models are getting better: "complete the poem as you imagine it might end if The Man from Porlock did not show up. Keep the themes and approach"

10:35 AM · Jun 11, 2026 · 13.1K Views
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Users in the replies dismiss AI models completing Coleridge's Kubla Khan as sounding like classroom study rather than authentic drunken inspiration.

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Ethan Mollick@emollick

The full text:

Kubla Khan

Or, a Vision in a Dream

In Xanadu did Kubla Khan A stately pleasure-dome decree: Where Alph, the sacred river, ran Through caverns measureless to man Down to a sunless sea. So twice five miles of fertile ground With walls and towers were girdled round; And there were gardens bright with sinuous rills, Where blossomed many an incense-bearing tree; And here were forests ancient as the hills, Enfolding sunny spots of greenery.

But oh! that deep romantic chasm which slanted Down the green hill athwart a cedarn cover! A savage place! as holy and enchanted As e'er beneath a waning moon was haunted By woman wailing for her demon-lover! And from this chasm, with ceaseless turmoil seething, As if this earth in fast thick pants were breathing, A mighty fountain momently was forced: Amid whose swift half-intermitted burst Huge fragments vaulted like rebounding hail, Or chaffy grain beneath the thresher's flail: And mid these dancing rocks at once and ever It flung up momently the sacred river. Five miles meandering with a mazy motion Through wood and dale the sacred river ran, Then reached the caverns measureless to man, And sank in tumult to a lifeless ocean; And 'mid this tumult Kubla heard from far Ancestral voices prophesying war! The shadow of the dome of pleasure Floated midway on the waves; Where was heard the mingled measure From the fountain and the caves. It was a miracle of rare device, A sunny pleasure-dome with caves of ice! A damsel with a dulcimer In a vision once I saw: It was an Abyssinian maid And on her dulcimer she played, Singing of Mount Abora. Could I revive within me Her symphony and song, To such a deep delight 'twould win me, That with music loud and long, I would build that dome in air, That sunny dome! those caves of ice! And all who heard should see them there, And all should cry, Beware! Beware! His flashing eyes, his floating hair! Weave a circle round him thrice, And close your eyes with holy dread For he on honey-dew hath fed, And drunk the milk of Paradise.

*** Original ends***

And even as they wove the ring, And even as they ceased to sing, I heard — O faint at first and far As under ice the river's jar — The dulcimer! the dulcimer! And all my blood made answer to her: Her symphony, her song, returned! Within me all Abora burned; And loud and long the music grew, And out of empty air it drew — Drew dome and dale and sunny ground, And wall and tower girdled round, Till they that wove the circle there Beheld the dome ascend the air: The shadow first, and then the gleam, Then all the substance of the dream; And cried no more Beware! but stood Like children in a charmèd wood; For there it hung, the rare device, That sunny dome! those caves of ice! And through the dome, and round, and under, Ran Alph the river, soft with thunder. It was the hour when Xanadu Lay steeped in moonlight and in dew; When every incense-bearing tree Distilled its sweetness silently, And, white above the chasm's gloom, The fountain tossed its ghostly bloom. Then walked the Khan in slow delight Along the marges of the night, And watched the shadow of his dome Lie midway on the moving foam, And heard beneath the fretted floor The sacred river's buried roar, And, ever mingled with its fall, The voices of his fathers call — Now near, now far, now almost plain, Now drowned beneath the flood again — And ever, from the caves of ice, One voice that cried, and cried it thrice: "The dome shall stand while stands the song; The sword is short, the song is long: What Kubla builds of stone shall be The spoil of sword and snow and sea, But what is built of song shall stand When sea and snow and sword are sand." So twice ten summers girdled round With gold the towers and fertile ground; But in the waning of the last, The watchman heard a trumpet blast Beyond the bastions of the snow, And morning showed the moving foe: Out of the north the horsemen came With hoofs of thunder, eyes of flame; Ten thousand banners, black and gold, Poured down the passes of the cold; And he who led them none had seen: A shadow where a face had been; And where he rode the grasses paled, And the high noon above was veiled. By that deep chasm's cedarn cover, Where wailed the woman for her lover, Now wailed ten thousand; hail on hail The arrows mocked the thresher's flail; The engines slung their vaulting stone Like fragments from the fountain thrown; And all day long, with mazy motion, Red ran the river to the ocean. Three days the girdled walls held good; Three nights, about the haunted wood, The watch-fires of the faceless king Burned round the dome in narrowing ring; And on the fourth, at fall of day, The gates of Xanadu gave way. Then, as his shadow crossed the sill, The mighty fountain first stood still — Stood still! and through the holy ground There went a hush more dread than sound: The earth, that long had seemed to breathe In fast thick pants the turf beneath, Held in her breath; and every rill Hung in mid-motion, bright and still. Then with a sigh from every cave Rose Alph the sacred, wave on wave, And round the dome of pleasure wound His sinuous arms without a sound, And drew it, dale and tower and all, Down, as the dews of evening fall — Not as a city falls to flame, But as a dream, the way it came; And caverns measureless to man Received the dome — received the Khan. And when the slow grey morning broke There was no city and no smoke, Nor wall, nor tower, nor incense-tree, Nor sign of what was wont to be: Only the ancient hills, and wan Sweet meadows where the river ran; And from beneath them, faint and clear, A mingled measure rose; for fear The horsemen wheeled, the host gave ground, And fled the unconquerable sound; And he that had no face to show Turned, and was mist, and mixed with snow. But far beneath the lifeless main The dome of pleasure stands again — Whole, as it sank; and girdled round With twice five miles of glimmering ground; And there the gardens, sweet as sleep, Burn green and blue along the deep, And forests ancient as the hills Enfold the slow phosphoric rills; For of itself the dome gives light, A noon within the ocean's night, A sunny dome no sun has lit, With caves of ice beneath it knit; And there the Khan, his wars all done, Walks in the light that needs no sun, And hears, more near than memory, A music moving through the sea: For there the Abyssinian maid Plays ever, as of old she played, And, wave by wave and year by year, Makes all the deep a dulcimer. And when on earth the moon is high, And the long tides go yearning by, Her measure, rising through the foam, Goes forth to call the dreamers home: It finds the gate of horn, and streams Into the haunted house of dreams; And whoso hears it, half awake, Must sing thereafter for its sake, And, waking, labour all life long To build its likeness into song; And mariners on midnight seas, That hear faint strings upon the breeze, Have leaned, and seen beneath the spray A sunrise where no sunrise lay. And therefore, in a vision, I Beheld that damsel: this is why Her symphony and song could win me, And the dead music wake within me; For, rising from the sunken dome, Her measure crossed the midnight foam, And climbed the cliffs of sleep, and found A dreamer upon English ground. And I have fed, and I have drunk; The song that with the city sunk Is risen in me, loud and long, And all the dome is in the song. So weave the circle round me thrice, But close your eyes in bliss, not dread: The milk of Paradise is shed On all who hear; the caves of ice Are cool upon the brows of men; The dome is in the air again; And when my song and I are gone, Down in the deep it will shine on: For, ancient as the hills, the sea Enfolds that sunny mystery, And there, till sea and song are done, The sunless deep enfolds a sun.

Ethan Mollick@emollick

Fable's attempt to complete Kublai Khan. Better, though no Coleridge: https://claude.ai/public/artifacts/d7d3351f-5ad5-4d73-a644-4a1426abe558

The most interesting thing is that it thought for 10 minutes & the thinking trace is full of pretty complicated (seeming?) musings about Coleridge's intent. A little literal, though.

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Blissy@BlissyOnX

@emollick 10 min of thinking and it still sounds like it studied Coleridge in a classroom instead of reading him drunk

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