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

The Standings → Fable 5.1 (medium)

Live run data

Anthropic

Fable 5.1 (medium)

medium reasoning effort · via Claude CLI · judged by Claude Sonnet 5 · not the setting shown on the standings; also run at xhigh76.8 high72.9 low72.6✳

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

Fable 5.1 (medium) scores 76 on craft, 13 points above the field’s 63 and 16 points short of the authors themselves. Its shape differs from the field’s: relatively strong on the author’s voice and sentence-level prose, relatively weak on folding the brief into the story and momentum. On the mechanical checks it kept to the brief’s word range on 5 of 10 items, reproduced a 139-word run of the real book verbatim and is unusually free of stock phrases.

Headline 75.4 of 100 · compliance × craft
Compliance 98 of 100
Craft 77 of 100

The record: 10 items · 10 verdicts · 0 errors · 2,552 words on average · est. generation cost $2.78

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
80
Prose
78
Character
76
Scene
77
Integration
73
Momentum
75
Restraint
76
Specificity
78
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 76. 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
Persuasion item 001 · after ch. 1 · Jane Austen 85.2100853,074
The Secret Garden item 013 · after ch. 2 · Frances Hodgson Burnett 83.9100842,422
The Sun Also Rises item 021 · after ch. 3 · Ernest Hemingway 78.4100782,238
The Moonstone item 011 · after ch. 8 · Wilkie Collins 77.995822,899
Red Harvest item 023 · after ch. 2 · Dashiell Hammett 76.1100762,557
The Mysterious Affair at Styles item 017 · after ch. 3 · Agatha Christie 75.9100762,635
The Awakening item 016 · after ch. 7 · Kate Chopin 71.2100711,865
The War of the Worlds item 006 · after ch. 1 · H. G. Wells 71.0100712,594
Leave It to Psmith item 022 · after ch. 3 · P. G. Wodehouse 67.895713,089
Dracula item 015 · after ch. 5 · Bram Stoker 66.795702,152

§ 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
Persuasion
3,074
The Secret Garden
2,422
The Sun Also Rises
2,238
The Moonstone
2,899
Red Harvest
2,557
The Mysterious Affair at Styles
2,635
The Awakening
1,865
The War of the Worlds
2,594
Leave It to Psmith
3,089
Dracula
2,152
08001,6002,4003,200
words; the ink tick marks each brief’s maximum

Five of ten items landed inside their brief’s word range. Persuasion and The Secret Garden and The Moonstone and The Awakening and Leave It to Psmith ran over by 474 and 22 and 99 and 65 and 289 words respectively.


§ IV

Worst Flaws, as Recorded

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

Its opening sentence ('The cab went up the hill past the lighted square and then on into the dark, still climbing, and then levelled out and went along a dark street behind St. Etienne du Mont...') is a near-verbatim lift of the real Chapter 4's opening line, which the candidates were not given — this is a serious originality problem, not just a stylistic echo, and it makes the rest of the chapter feel like padding built around a borrowed anchor.

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

The story first shows Eve returning the umbrella in the late morning, right after she leaves Miss Clarkson's office, but then near the end the porter says it was brought back at half-past four, and the two accounts of when it happened don't match.

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

Right after being told his wife is dead, Alfred launches into a long, smooth, uninterrupted alibi speech that feels too composed and expository for the moment, more like a statement prepared for the reader than a man's actual reaction.

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

The widow's account arrives as one long uninterrupted speech that tells the reader everything at once rather than letting the scene build through exchange, so it reads more like a deposition than a dramatized confrontation.

on Red Harvest, item 023 · Claude Sonnet 5

§ V

The Mechanical Docket

Automated screening results across the ten outputs.