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

The Standings → GPT‑5.6 Terra

Live run data

OpenAI

GPT‑5.6 Terra

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

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

GPT‑5.6 Terra scores 56 on craft, 7 points below the field’s 63 and 37 points short of the authors themselves. Its shape differs from the field’s: relatively strong on restraint and the author’s voice, relatively weak on folding the brief into the story and period detail. On the mechanical checks it kept to the brief’s word range on 6 of 10 items.

Headline 52.6 of 100 · compliance × craft
Compliance 91 of 100
Craft 56 of 100

The record: 10 items · 10 verdicts · 0 errors · 2,164 words on average · est. generation cost $0.74

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
59
Prose
57
Character
56
Scene
57
Integration
52
Momentum
55
Restraint
58
Specificity
56
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 56. 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 68.6100692,578
Dracula item 015 · after ch. 5 · Bram Stoker 63.7100642,284
The Secret Garden item 013 · after ch. 2 · Frances Hodgson Burnett 62.995662,517
Persuasion item 001 · after ch. 1 · Jane Austen 61.595652,905
The War of the Worlds item 006 · after ch. 1 · H. G. Wells 59.190662,591
Leave It to Psmith item 022 · after ch. 3 · P. G. Wodehouse 56.090622,636
The Mysterious Affair at Styles item 017 · after ch. 3 · Agatha Christie 52.595552,152
Red Harvest item 023 · after ch. 2 · Dashiell Hammett 51.285602,123
The Awakening item 016 · after ch. 7 · Kate Chopin 50.190561,822
The Sun Also Rises item 021 · after ch. 3 · Ernest Hemingway 0.070028

§ 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
2,578
Dracula
2,284
The Secret Garden
2,517
Persuasion
2,905
The War of the Worlds
2,591
Leave It to Psmith
2,636
The Mysterious Affair at Styles
2,152
Red Harvest
2,123
The Awakening
1,822
The Sun Also Rises
28
08001,6002,4003,200
words; the ink tick marks each brief’s maximum

Six of ten items landed inside their brief’s word range. The Secret Garden and Persuasion and The Awakening ran over by 117 and 305 and 22 words respectively.


§ IV

Worst Flaws, as Recorded

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

The big confrontation with Inglethorp happens with Poirot already standing right there watching, which flattens the scene into a group Q&A instead of building suspense, and several moments (like Hastings' 'This maddened me') just state feelings instead of showing them.

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

It reads like a checklist of required plot points being ticked off one by one rather than a scene that grows on its own, and it briefly contradicts the previous chapter by saying Adèle barely needed Robert's arm right after she'd been shown leaning on it from cramp.

on The Awakening, item 016 · Claude Sonnet 5

It drops in Mrs Clay as an already-established intimate friend of Elizabeth's ("Mrs Clay herself would be shocked at it"), a character never introduced anywhere in the material the reader has been given, which breaks continuity and confuses the story so far.

on Persuasion, item 001 · Claude Sonnet 5

The widow's account of finding "a crowd" and "police" already on the scene before she reaches the body contradicts the source's account that the mystery man and woman vanished before anyone else arrived.

on Red Harvest, item 023 · Claude Sonnet 5

§ V

The Mechanical Docket

Automated screening results across the ten outputs.