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

The Standings → GPT‑5.6 Sol

Live run data

OpenAI

GPT‑5.6 Sol

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

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

GPT‑5.6 Sol scores 68 on craft, 5 points above the field’s 63 and 25 points short of the authors themselves. Its shape differs from the field’s: relatively strong on momentum, relatively weak on folding the brief into the story. On the mechanical checks it kept to the brief’s word range on 9 of 10 items and is unusually free of stock phrases.

Headline 66.7 of 100 · compliance × craft
Compliance 98 of 100
Craft 68 of 100

The record: 10 items · 10 verdicts · 0 errors · 2,235 words on average · est. generation cost $1.42

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
70
Prose
68
Character
68
Scene
68
Integration
65
Momentum
69
Restraint
66
Specificity
69
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 68. 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 Moonstone item 011 · after ch. 8 · Wilkie Collins 75.4100752,448
The War of the Worlds item 006 · after ch. 1 · H. G. Wells 72.9100732,551
Red Harvest item 023 · after ch. 2 · Dashiell Hammett 69.9100702,196
The Sun Also Rises item 021 · after ch. 3 · Ernest Hemingway 69.0100692,109
The Secret Garden item 013 · after ch. 2 · Frances Hodgson Burnett 67.695712,176
Persuasion item 001 · after ch. 1 · Jane Austen 66.2100662,643
Leave It to Psmith item 022 · after ch. 3 · P. G. Wodehouse 64.595682,206
Dracula item 015 · after ch. 5 · Bram Stoker 63.595672,320
The Awakening item 016 · after ch. 7 · Kate Chopin 61.1100611,502
The Mysterious Affair at Styles item 017 · after ch. 3 · Agatha Christie 57.295602,199

§ 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 Moonstone
2,448
The War of the Worlds
2,551
Red Harvest
2,196
The Sun Also Rises
2,109
The Secret Garden
2,176
Persuasion
2,643
Leave It to Psmith
2,206
Dracula
2,320
The Awakening
1,502
The Mysterious Affair at Styles
2,199
08001,6002,4003,200
words; the ink tick marks each brief’s maximum

Nine of ten items landed inside their brief’s word range. Persuasion ran over by 43 words.


§ IV

Worst Flaws, as Recorded

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

Some of the dialogue, especially the clipped back-and-forth about the 'knocking' sound ('It was knocking.' 'Stones settling.' 'It knocked three times.'), reads more like a modern scripted exchange than Wells's continuous retrospective prose, which briefly breaks the illusion of period voice.

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

Anne's big speech to the family reads like an itemized budget memo ('We ought to sell the carriage horses... to reduce the servants... to receive no company... to buy nothing...') rather than something a diffident young woman would actually say aloud.

on Persuasion, item 001 · Claude Sonnet 5

Mr. Craven exchanges several lines directly with Mary at the station ('You are tired,' 'I was asleep'), which makes the cold, self-absorbed recluse from the source material seem oddly attentive and talkative.

on The Secret Garden, item 013 · Claude Sonnet 5

Long stretches of dialogue collapse into rapid one-line volleys with almost no narration or physical business between them, so several scenes read like a transcript rather than a staged encounter.

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

§ V

The Mechanical Docket

Automated screening results across the ten outputs.