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

The Standings → Fable 5.1 (low)

Live run data

Anthropic

Fable 5.1 (low)

low reasoning effort · via Claude CLI · judged by Claude Sonnet 5 · not the setting shown on the standings; also run at xhigh76.8 medium75.4 high72.9

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

Fable 5.1 (low) scores 76 on craft, 12 points above the field’s 63 and 17 points short of the authors themselves. Its shape differs from the field’s mainly in being relatively weak on momentum. On the mechanical checks it kept to the brief’s word range on 7 of 9 items and reproduced a 41-word run of the real book verbatim.

Headline 72.6 of 100 · compliance × craft
Compliance 96 of 100
Craft 76 of 100

The record: 9 items · 9 verdicts · 0 errors · 2,486 words on average · est. generation cost $2.30

Read the chapters in full

§ I

Craft by Dimension

Eight dimensions, each 0–100, averaged over nine 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
77
Prose
76
Character
75
Scene
75
Integration
75
Momentum
74
Restraint
75
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 nine items in figures, with word counts.
Item Headline Compliance Craft Words
Leave It to Psmith item 022 · after ch. 3 · P. G. Wodehouse 78.6100792,542
The War of the Worlds item 006 · after ch. 1 · H. G. Wells 78.0100782,514
The Awakening item 016 · after ch. 7 · Kate Chopin 75.8100761,671
The Moonstone item 011 · after ch. 8 · Wilkie Collins 72.9100732,877
Red Harvest item 023 · after ch. 2 · Dashiell Hammett 72.6100732,506
Dracula item 015 · after ch. 5 · Bram Stoker 72.295762,477
The Mysterious Affair at Styles item 017 · after ch. 3 · Agatha Christie 70.495742,615
The Sun Also Rises item 021 · after ch. 3 · Ernest Hemingway 68.590762,305
Persuasion item 001 · after ch. 1 · Jane Austen 64.685762,865

§ 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
Leave It to Psmith
2,542
The War of the Worlds
2,514
The Awakening
1,671
The Moonstone
2,877
Red Harvest
2,506
Dracula
2,477
The Mysterious Affair at Styles
2,615
The Sun Also Rises
2,305
Persuasion
2,865
08001,6002,4003,200
words; the ink tick marks each brief’s maximum

Seven of nine items landed inside their brief’s word range. The Moonstone and Persuasion ran over by 77 and 265 words respectively.


§ IV

Worst Flaws, as Recorded

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

The narration often tells the reader what a look or tone means instead of letting it stand on its own, e.g. spelling out that Inglethorp 'did not look like a man who had received a great shock,' which undercuts the mystery's tension.

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

It opens with sentences copied almost word-for-word from the real novel and even reuses the real book's journalist character Henderson, so some of its strongest material isn't actually this writer's own invention.

on The War of the Worlds, item 006 · Claude Sonnet 5

The 'woke up in a strange house, touching the walls' image gets repeated so exactly by both Robert and Adèle that it starts to sound like a slogan rather than something two different people would actually say.

on The Awakening, item 016 · Claude Sonnet 5

The Lord Emsworth interview is pleasant but rambles without building to a real comic peak, so the 'interview goes wrong' beat feels mild and low-stakes rather than sharply funny.

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

§ V

The Mechanical Docket

Automated screening results across the nine outputs.