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

The Standings → GPT‑6.1 Sol (medium)

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OpenAI

GPT‑6.1 Sol (medium)

medium reasoning effort · via Codex CLI · judged by Claude Sonnet 5 · the setting shown on the standings; also run at xhigh63.1 high63.0

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

GPT‑6.1 Sol (medium) scores 66 on craft, 3 points above the field’s 63 and 27 points short of the authors themselves. Its shape differs from the field’s: relatively strong on restraint and folding the brief into the story, relatively weak on momentum and building scenes. On the mechanical checks it kept to the brief’s word range on 10 of 10 items and is unusually free of stock phrases.

Headline 66.1 of 100 · compliance × craft
Compliance 100 of 100
Craft 66 of 100

The record: 10 items · 10 verdicts · 0 errors · 2,296 words on average · est. generation cost $0.75

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
66
Prose
65
Character
66
Scene
65
Integration
66
Momentum
63
Restraint
71
Specificity
66
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 75.8100762,445
The Sun Also Rises item 021 · after ch. 3 · Ernest Hemingway 74.2100742,124
The War of the Worlds item 006 · after ch. 1 · H. G. Wells 73.8100742,375
The Secret Garden item 013 · after ch. 2 · Frances Hodgson Burnett 73.2100732,243
Dracula item 015 · after ch. 5 · Bram Stoker 66.0100662,341
The Mysterious Affair at Styles item 017 · after ch. 3 · Agatha Christie 64.6100652,503
The Moonstone item 011 · after ch. 8 · Wilkie Collins 61.6100622,489
The Awakening item 016 · after ch. 7 · Kate Chopin 59.8100601,730
Leave It to Psmith item 022 · after ch. 3 · P. G. Wodehouse 57.0100572,461
Red Harvest item 023 · after ch. 2 · Dashiell Hammett 55.4100552,252

§ 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
2,445
The Sun Also Rises
2,124
The War of the Worlds
2,375
The Secret Garden
2,243
Dracula
2,341
The Mysterious Affair at Styles
2,503
The Moonstone
2,489
The Awakening
1,730
Leave It to Psmith
2,461
Red Harvest
2,252
08001,6002,4003,200
words; the ink tick marks each brief’s maximum

Ten of ten items landed inside their brief’s word range.


§ IV

Worst Flaws, as Recorded

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

The closing twist about a forger inventing news of Jonathan feels imported from a detective story rather than grown out of Stoker's slow-building dread, and it introduces a plot thread (Anton Weiss) that the rest of the chapter never earns.

on Dracula, item 015 · Claude Sonnet 5

The chapter breaks into many short, clipped paragraphs and quick exchanges that read more like a factual report than the flowing, cumulative sentences of the original book, so it doesn't fully sound like Wells.

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

Poirot doesn't sound like Poirot here — none of his French exclamations or theatrical flourishes come through, so he reads as a generic quiet detective rather than the vivid character from the books.

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

The ending basically states out loud that Mary has decided to find out what the noise was, which reads like it's checking off the assignment rather than showing that decision happen naturally.

on The Secret Garden, item 013 · Claude Sonnet 5

§ V

The Mechanical Docket

Automated screening results across the ten outputs.