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

The Standings → Claude Haiku 5.5 (high)

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Anthropic

Claude Haiku 5.5 (high)

high reasoning effort · via Claude CLI · judged by Claude Sonnet 5 · not the setting shown on the standings; also run at xhigh74.7 medium64.3 low60.5

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

Claude Haiku 5.5 (high) scores 73 on craft, 10 points above the field’s 63 and 20 points short of the authors themselves. Its shape differs from the field’s: relatively strong on sentence-level prose and building scenes, relatively weak on the author’s voice and restraint. On the mechanical checks it kept to the brief’s word range on 7 of 10 items.

Headline 70.8 of 100 · compliance × craft
Compliance 96 of 100
Craft 73 of 100

The record: 10 items · 10 verdicts · 0 errors · 2,185 words on average · est. generation cost $0.10

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
73
Prose
76
Character
73
Scene
75
Integration
71
Momentum
73
Restraint
71
Specificity
75
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 73. 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
The Sun Also Rises item 021 · after ch. 3 · Ernest Hemingway 81.2100811,597
The War of the Worlds item 006 · after ch. 1 · H. G. Wells 77.6100782,021
The Awakening item 016 · after ch. 7 · Kate Chopin 75.8100761,653
The Secret Garden item 013 · after ch. 2 · Frances Hodgson Burnett 75.090832,488
Persuasion item 001 · after ch. 1 · Jane Austen 71.8100722,280
The Moonstone item 011 · after ch. 8 · Wilkie Collins 69.095732,855
Dracula item 015 · after ch. 5 · Bram Stoker 68.595722,095
The Mysterious Affair at Styles item 017 · after ch. 3 · Agatha Christie 65.090722,276
Leave It to Psmith item 022 · after ch. 3 · P. G. Wodehouse 63.495672,286
Red Harvest item 023 · after ch. 2 · Dashiell Hammett 60.2100602,303

§ 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
The Sun Also Rises
1,597
The War of the Worlds
2,021
The Awakening
1,653
The Secret Garden
2,488
Persuasion
2,280
The Moonstone
2,855
Dracula
2,095
The Mysterious Affair at Styles
2,276
Leave It to Psmith
2,286
Red Harvest
2,303
08001,6002,4003,200
words; the ink tick marks each brief’s maximum

Seven of ten items landed inside their brief’s word range. The Secret Garden and The Moonstone ran over by 88 and 55 words respectively.


§ IV

Worst Flaws, as Recorded

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

The last line tells the reader what the narrator is feeling ('something in me had already begun to listen') instead of just showing it, which breaks the understated tone the rest of the chapter works hard to keep.

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

Robert's remembered compliment about Edna's beauty, plus the long scene of her staring at herself in the mirror afterward, is a more obvious, soap-opera-style moment than Chopin's usual quiet understatement.

on The Awakening, item 016 · Claude Sonnet 5

The letter is from an invented lawyer named Thomas Cardew who has no connection to the story's real family solicitor Mr. Bruff, so the whole episode feels slightly bolted on rather than woven into the book.

on The Moonstone, item 011 · Claude Sonnet 5

The job interview is handed to Baxter instead of Lord Emsworth, which contradicts what the earlier chapters set up, and Psmith feels unusually quiet and un-chatty for a character famous for talking nonstop.

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

§ V

The Mechanical Docket

Automated screening results across the ten outputs.