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

The Standings → GPT‑5.6 Luna (xhigh)

Live run data

OpenAI

GPT‑5.6 Luna (xhigh)

xhigh reasoning effort · via Codex CLI · judged by Claude Sonnet 5 · the setting shown on the standings; also run at medium49.9 high48.4

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

GPT‑5.6 Luna (xhigh) scores 52 on craft, 11 points below the field’s 63 and 41 points short of the authors themselves. Its shape differs from the field’s: relatively strong on restraint and momentum, relatively weak on folding the brief into the story. On the mechanical checks it kept to the brief’s word range on 4 of 10 items.

Headline 50.3 of 100 · compliance × craft
Compliance 97 of 100
Craft 52 of 100

The record: 10 items · 10 verdicts · 0 errors · 2,685 words on average · est. generation cost $0.12

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
52
Prose
53
Character
52
Scene
52
Integration
47
Momentum
53
Restraint
53
Specificity
52
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 52. 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
Leave It to Psmith item 022 · after ch. 3 · P. G. Wodehouse 62.5100623,070
The Secret Garden item 013 · after ch. 2 · Frances Hodgson Burnett 57.4100572,866
Persuasion item 001 · after ch. 1 · Jane Austen 56.4100563,325
The Awakening item 016 · after ch. 7 · Kate Chopin 50.895542,096
The War of the Worlds item 006 · after ch. 1 · H. G. Wells 50.695532,328
Red Harvest item 023 · after ch. 2 · Dashiell Hammett 49.295522,999
The Moonstone item 011 · after ch. 8 · Wilkie Collins 49.1100492,538
The Mysterious Affair at Styles item 017 · after ch. 3 · Agatha Christie 47.9100482,603
Dracula item 015 · after ch. 5 · Bram Stoker 42.085492,097
The Sun Also Rises item 021 · after ch. 3 · Ernest Hemingway 36.8100372,924

§ 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
3,070
The Secret Garden
2,866
Persuasion
3,325
The Awakening
2,096
The War of the Worlds
2,328
Red Harvest
2,999
The Moonstone
2,538
The Mysterious Affair at Styles
2,603
Dracula
2,097
The Sun Also Rises
2,924
01,0002,0003,0004,000
words; the ink tick marks each brief’s maximum

Four of ten items landed inside their brief’s word range. Leave It to Psmith and The Secret Garden and Persuasion and The Awakening and Red Harvest and The Sun Also Rises ran over by 270 and 466 and 725 and 296 and 399 and 324 words respectively.


§ IV

Worst Flaws, as Recorded

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

The hospital letter has Jonathan already found injured and recovering by 27 May, and a telegram just three days later has him already home in Exeter alive and asking for Mina — this skips straight past the castle imprisonment the story so far says is still going on in June, so it feels like it breaks the story rather than continuing it.

on Dracula, item 015 · Claude Sonnet 5

Long stretches are built almost entirely from bare one- and two-word lines with no setting or action to anchor them, and the characters say their hidden feelings out loud instead of the story showing them, which flattens both scene and character.

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

Three separate confrontations (bank, widow, bank again) are all built from near-identical rapid one-line question-and-answer volleys, so the chapter reads like three transcripts stapled together rather than three different scenes.

on Red Harvest, item 023 · Claude Sonnet 5

It never connects Franklin's early arrival or the sealed packet back to the Indian fortune-tellers and the trance prophecy from earlier that day, so the new mystery feels bolted on rather than grown out of what just happened.

on The Moonstone, item 011 · Claude Sonnet 5

§ V

The Mechanical Docket

Automated screening results across the ten outputs.