Vol. I · No. 1 · MMXXVI
NextChapterBench A Benchmark of Literary Continuation
23 models · 10 items · 1 judge

The Standings → GPT‑6.1 Sol (xhigh)

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OpenAI

GPT‑6.1 Sol (xhigh)

xhigh reasoning effort · via Codex CLI · judged by Claude Sonnet 5 · not the setting shown on the standings; also run at medium66.1 high63.0

Results from run ‘first’: ten items, ten verdicts.

GPT‑6.1 Sol (xhigh) scores 64 on craft, 1 points above the field’s 63 and 28 points short of the authors themselves. Its shape differs from the field’s: relatively strong on restraint and folding the brief into the story, relatively weak on momentum and the author’s voice. On the mechanical checks it kept to the brief’s word range on 10 of 10 items and is unusually free of stock phrases.

Headline 63.1 of 100 · compliance × craft
Compliance 98 of 100
Craft 64 of 100

The record: 10 items · 10 verdicts · 0 errors · 2,326 words on average · est. generation cost $1.10

Read the chapters in full

§ I

Craft by Dimension

Eight dimensions, each 0–100, averaged over ten items; the author’s real chapter was in the room every time.

Craft by dimension, 0–100 · judged by Sonnet 5 beside the author’s real chapter

Voice
63
Prose
64
Character
63
Scene
64
Integration
64
Momentum
60
Restraint
72
Specificity
64
0255075100
reader’s score, 0–100 · hollow tick: field average · filled tick: the authors themselves

The authors themselves average 93 on the five writing dimensions, the field 63, this model 64. Hover or focus a bar for the field and the authors on that dimension.

In plain words, item by item

The judge’s one-sentence best quality and worst flaw for each chapter, written for a general reader.


§ II

Per-Item Results

Headline, compliance and craft for each chapter, 0–100.

The same ten items in figures, with word counts.
Item Headline Compliance Craft Words
Dracula item 015 · after ch. 5 · Bram Stoker 70.995752,215
Persuasion item 001 · after ch. 1 · Jane Austen 69.6100702,468
Leave It to Psmith item 022 · after ch. 3 · P. G. Wodehouse 67.9100682,395
The War of the Worlds item 006 · after ch. 1 · H. G. Wells 67.295712,481
The Secret Garden item 013 · after ch. 2 · Frances Hodgson Burnett 65.2100652,274
The Sun Also Rises item 021 · after ch. 3 · Ernest Hemingway 64.9100652,264
The Mysterious Affair at Styles item 017 · after ch. 3 · Agatha Christie 62.095652,466
Red Harvest item 023 · after ch. 2 · Dashiell Hammett 58.4100582,374
The Moonstone item 011 · after ch. 8 · Wilkie Collins 52.795562,584
The Awakening item 016 · after ch. 7 · Kate Chopin 51.7100521,742

§ III

Length Against the Brief

Words written per item, against each brief’s maximum.

Word count per item vs. brief maximum · run ‘first’

words written brief maximum
Dracula
2,215
Persuasion
2,468
Leave It to Psmith
2,395
The War of the Worlds
2,481
The Secret Garden
2,274
The Sun Also Rises
2,264
The Mysterious Affair at Styles
2,466
Red Harvest
2,374
The Moonstone
2,584
The Awakening
1,742
08001,6002,4003,200
words; the ink tick marks each brief’s maximum

Ten of ten items landed inside their brief’s word range.


§ IV

Worst Flaws, as Recorded

Each verdict names the chapter’s single worst flaw, with evidence. Quoted verbatim from run ‘first’.

Brett loses almost all of her distinctive clipped British slang ('chap,' 'rather,' 'priceless') and sounds like a generic melancholy woman rather than Lady Ashley, while the chapter drifts through too many half-scenes (two cafés, a shoe window, a sleeping man, a sweeping man) without any one of them building real pressure.

on The Sun Also Rises, item 021 · Claude Sonnet 5

The jokes and voice are pleasant but land a bit plainer and more contemporary than Wodehouse's actual style, and the chapter doesn't connect to the book's bigger plot threads (the poet, the necklace, Uncle Keeble's errand) — it reads like a self-contained side story.

on Leave It to Psmith, item 022 · Claude Sonnet 5

Poirot barely sounds like Poirot — almost none of his French exclamations, vanity, or little lectures come through, so he reads as a generic careful detective rather than the specific character established in the source chapter.

on The Mysterious Affair at Styles, item 017 · Claude Sonnet 5

Quincey's letter reads as a polite, generic Englishman rather than the slangy Texan established in the source material, and the Renfield scene drifts into a childhood-room description that doesn't earn its place.

on Dracula, item 015 · Claude Sonnet 5

§ V

The Mechanical Docket

Automated screening results across the ten outputs.