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

The Standings → GPT‑5.5

Live run data

OpenAI

GPT‑5.5

xhigh reasoning effort · via Codex CLI · judged by Claude Sonnet 5

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

GPT‑5.5 scores 66 on craft, 3 points above the field’s 63 and 26 points short of the authors themselves. Its shape differs from the field’s: relatively strong on restraint, relatively weak on period detail and building scenes. On the mechanical checks it kept to the brief’s word range on 3 of 10 items.

Headline 64.9 of 100 · compliance × craft
Compliance 98 of 100
Craft 66 of 100

The record: 10 items · 10 verdicts · 0 errors · 2,098 words on average · est. generation cost $2.28

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
68
Prose
67
Character
66
Scene
65
Integration
65
Momentum
66
Restraint
70
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 66. 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 78.5100782,296
Leave It to Psmith item 022 · after ch. 3 · P. G. Wodehouse 76.0100762,916
Dracula item 015 · after ch. 5 · Bram Stoker 73.495773,509
The War of the Worlds item 006 · after ch. 1 · H. G. Wells 71.495752,692
The Mysterious Affair at Styles item 017 · after ch. 3 · Agatha Christie 68.595722,654
Red Harvest item 023 · after ch. 2 · Dashiell Hammett 63.695672,448
The Moonstone item 011 · after ch. 8 · Wilkie Collins 60.0100601,620
The Sun Also Rises item 021 · after ch. 3 · Ernest Hemingway 59.1100591,463
The Secret Garden item 013 · after ch. 2 · Frances Hodgson Burnett 51.210051814
The Awakening item 016 · after ch. 7 · Kate Chopin 47.410047570

§ 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
2,296
Leave It to Psmith
2,916
Dracula
3,509
The War of the Worlds
2,692
The Mysterious Affair at Styles
2,654
Red Harvest
2,448
The Moonstone
1,620
The Sun Also Rises
1,463
The Secret Garden
814
The Awakening
570
01,0002,0003,0004,000
words; the ink tick marks each brief’s maximum

Three of ten items landed inside their brief’s word range. Leave It to Psmith and Dracula and The War of the Worlds ran over by 116 and 909 and 92 words respectively.


§ IV

Worst Flaws, as Recorded

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

Several key passages, especially the two economy plans and Anne's speech, are described in vague, list-like terms rather than being rendered with specific concrete detail, so they read more like a summary than a scene actually happening.

on Persuasion, item 001 · Claude Sonnet 5

The falling star is made to land during the very walk the source chapter says happens while the missile is still ten million miles away, which contradicts the timeline it is continuing from.

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

A couple of Seward's diary passages explain his own conclusions too plainly ("This may explain it," "I must be more guarded in my own speech") instead of letting the reader infer them.

on Dracula, item 015 · Claude Sonnet 5

The widow's interrogation runs on too long with too many flat one-word denials, so it starts to feel like a checklist of questions rather than a real conversation between two people.

on Red Harvest, item 023 · Claude Sonnet 5

§ V

The Mechanical Docket

Automated screening results across the ten outputs.