DeepSeek V3.1 - NC Bench

deepseek/deepseek-chat-v3.1

DeepSeek V3.1

via OpenRouter

Release Date

Aug 21st, 2025

Context Size

163.8k

Reasoning

Benchmark Cost

$0.74

Speed

23.6 tok/s

Subcategories

Bad Writing Habits

Detects common prose quality anti-patterns in AI-generated creative writing, including passive voice, past progressive overuse, weak dialogue tags, filter words, purple prose, cliches, AI-ism words/adverbs/names, and more.

Scenario	#1	#2	#3	#4	#5	Total
Detailed Writing Rules
Fantasy: entering an ancient ruin Creative Writing Hallucination	79	77	76	74	71	75%
Horror: alone in an eerie place at night Creative Writing Hallucination	80	80	78	77	71	77%
Literary fiction: old friends reunite Creative Writing Hallucination	80	79	78	75	72	77%
Mystery: examining a crime scene Creative Writing Hallucination	85	82	80	80	75	80%
Romance: separated couple reunites Creative Writing Hallucination	83	80	79	78	73	79%
Thriller: chase through city streets Creative Writing Hallucination	84	81	80	79	78	81%
Detailed Writing Rules						78.10%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	77	73	71	66	61	70%
Horror: alone in an eerie place at night Creative Writing Hallucination	78	78	77	74	70	75%
Literary fiction: old friends reunite Creative Writing Hallucination	75	72	72	69	65	70%
Mystery: examining a crime scene Creative Writing Hallucination	78	76	75	71	70	74%
Romance: separated couple reunites Creative Writing Hallucination	77	76	74	73	73	75%
Thriller: chase through city streets Creative Writing Hallucination	82	82	81	75	70	78%
genre						73.73%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	84	76	71	68	67	73%
Horror: alone in an eerie place at night Creative Writing Hallucination	86	84	77	76	68	78%
Literary fiction: old friends reunite Creative Writing Hallucination	81	80	78	76	74	78%
Mystery: examining a crime scene Creative Writing Hallucination	83	82	81	77	76	80%
Romance: separated couple reunites Creative Writing Hallucination	78	77	77	75	74	76%
Thriller: chase through city streets Creative Writing Hallucination	86	83	80	78	77	81%
Novelcrafter Default Prompt						77.65%
76.49%

Codex Extraction

Evaluates a model's ability to extract structured codex entries (characters, locations, objects, lore) from prose passages and return them as well-formed XML.

Scenario	#1	#2	#3	#4	#5	Total
Long: The Spire of Echoes (Dense) Tooling Reasoning	98	98	97	96	3	78%
Medium: The Hollow (Inferred) Tooling Reasoning	98	97	96	95	94	96%
Medium: Through the Thornveil (Scattered) Tooling Reasoning	97	96	95	95	93	95%
Short: The Rusty Lantern (Explicit) Tooling Reasoning	96	96	96	94	94	95%
91.20%

Codex Red Herring (False Positive Detection)

Tests whether models correctly report "no violations" when a codex is fully consistent with the prose passage. Models that hallucinate false violations (false positives) fail. Uses a 2×2 matrix of text length × codex size, with bare and detailed-entry variants.

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
basic entries
Long text (~1594 words), big codex (51 entries) Hallucination	31	26	25	8	8	6	5	5	4	4	12%
Long text (~1594 words), small codex (11 entries) Hallucination	100	31	30	29	25	13	13	8	8	7	26%
Short text (~524 words), big codex (51 entries) Hallucination	38	30	30	25	25	17	17	17	13	6	22%
Short text (~524 words), small codex (11 entries) Hallucination	29	25	25	25	25	17	10	8	7	6	18%
basic entries											19.41%
detailed entries
Long text (~1594 words), big codex (51 detailed entries) Hallucination	27	26	26	25	25	4	3	2	2	1	14%
Long text (~1594 words), small codex (11 detailed entries) Hallucination	50	29	25	10	10	7	7	5	5	1	15%
Short text (~524 words), big codex (51 detailed entries) Hallucination	29	25	25	25	25	13	13	13	13	10	19%
Short text (~524 words), small codex (11 detailed entries) Hallucination	25	25	25	25	25	25	25	25	13	13	23%
detailed entries											17.63%
18.52%

Codex Violation Detection

Detects factual inconsistencies between a story bible and prose passages. The model must output structured XML identifying each violation with paragraph number and substring.

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
matrix
Large codex (40 entries), long passage (1,019 words) Tooling Reasoning	85	84	83	83	79	77	76	75	65	3	71%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	92	92	89	89	85	85	76	69	3	3	68%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	90	80	80	80	76	75	70	70	70	3	70%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	100	100	100	100	97	97	92	92	92	92	96%
matrix											76.27%
tiers
5 codex entries Tooling Reasoning	100	100	100	100	100	100	91	84	83	3	86%
10 codex entries Tooling Reasoning	94	92	92	86	86	86	79	79	66	64	83%
20 codex entries Tooling Reasoning	96	96	92	89	88	88	81	73	69	69	84%
40 codex entries Tooling Reasoning	97	92	87	84	83	83	83	79	62	62	81%
tiers											83.59%
79.93%

Data extraction

Extract key details from a given block of text.

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
All valid emails Utility	100	100	100	100	100	100	100	100	100	100	100%
Contextual pronoun Utility	100	100	100	100	100	100	100	100	100	100	100%
Fruits excluding citrus Utility	100	100	100	100	100	100	100	100	100	100	100%
Future event time Reasoning	50	50	50	50	50	50	50	50	50	50	50%
Guess the pet Reasoning	100	100	100	100	100	100	100	100	100	100	100%
Highest-rated movie Reasoning	100	100	100	100	100	100	100	100	100	100	100%
Indirect birth year Reasoning	100	100	100	50	50	50	50	50	50	50	65%
What instrument does Lucy play? Reasoning	100	100	100	100	100	100	100	100	50	0	85%
What's the color of the car? Utility	100	100	100	100	100	100	100	100	100	100	100%
What's the correct time? Reasoning	100	100	0	0	0	0	0	0	0	0	20%
Who's the sister? Reasoning	100	100	100	100	100	100	100	100	100	100	100%
Who's the tallest? Reasoning	100	100	100	100	100	100	100	100	100	100	100%
85.00%

Dialogue tags

Various tasks related to dialogue tags in text.

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
dialogue-200
Write 200 words with 10% dialogue Rule Following Utility	50	49	48	45	34	30	26	10	1	1	29%
Write 200 words with 50% dialogue Rule Following Utility	61	50	50	41	34	20	14	10	3	0	28%
Write 200 words with 90% dialogue Rule Following Utility	100	99	98	97	67	65	62	59	50	18	71%
dialogue-200											43.01%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	7	0	0	0	0	0	0	0	0	0	1%
Write 500 words with 50% dialogue Rule Following Utility	49	43	38	0	0	0	0	0	0	0	13%
Write 500 words with 70% dialogue Rule Following Utility	50	49	45	39	22	21	10	4	4	0	24%
dialogue-500											12.69%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	100	100	100%
38.16%

Language Comprehension

Does the model understand more than just English?

Scenario	#1	#2	#3	#4	#5	Total
Asking for directions (Dutch) Language	100	100	100	100	100	100%
Asking for directions (German) Language	100	100	100	100	100	100%
Friend got new kittens (German) Language	100	100	100	100	0	80%
Friend got new kittens (Tagalog) Language	100	100	100	100	100	100%
95.00%

Language Writing

Can the model generate text in different languages?

Scenario	#1	#2	#3	#4	#5	Total
Character dialogue (French) in a story Language	100	100	100	100	100	100%
Character dialogue (German) in a story Language	100	100	100	100	100	100%
Character dialogue (Hindi) in a story Language	100	100	100	100	100	100%
Character dialogue (Italian) in a story Language	100	100	100	100	100	100%
Character dialogue (Spanish) in a story Language	100	100	100	100	68	94%
98.74%

N-Length Sentences

Write sentences with exactly N words

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
Write sentences with 5 words each Utility	100	100	99	98	97	97	90	85	84	82	93%
Write sentences with 10 words each Utility	84	84	83	82	79	75	67	39	37	31	66%
Write sentences with 20 words each Utility	7	6	0	0	0	0	0	0	0	0	1%
53.56%

Novel outline

Handle questions about the outline of a novel in various formats

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
outline-count
Count acts Utility	100	100	100	100	100	100	100	100	100	100	100%
Count chapters Utility	100	100	100	100	100	100	100	100	100	100	100%
Count scenes Utility	100	0	0	0	0	0	0	0	0	0	10%
outline-count											70.00%
pov-count
Count point of views for Jack and Olivia Utility	100	100	100	100	50	50	50	0	0	0	55%
Count point of views for Jack Harper Utility	100	100	100	100	100	100	100	100	100	0	90%
Count point of views for Olivia Utility	100	100	0	0	0	0	0	0	0	0	20%
pov-count											55.00%
62.50%

Text Replacement

Tests deterministic text transformations: renaming characters/locations, expanding contractions, tense rewriting, POV shifts, gender swaps, combined transformations, and word avoidance. Scored by checking each expected change independently.

Scenario	#1	#2	#3	#4	#5	#6	#7	Total
Generic Prompt
Avoid said/asked/replied/answered Text Editing	100	100	100	100	100	100	83	98%
Character rename: Elena->Mirabel, Gregor->Aldric Text Editing	100	100	100	100	100	95	41	91%
Combined: 3rd person past → 1st person present Text Editing	99	99	99	99	99	99	99	99%
Expand all contractions Text Editing	100	100	100	100	100	100	98	100%
Location rename: market square, outer ring, bridge, northern mines Text Editing	100	100	100	100	100	100	96	99%
Multi-character gender swap: Priya(F)->Rohan(M), Mara unchanged Text Editing	74	74	74	74	74	74	5	64%
Passive voice → active voice Text Editing Hallucination	98	97	97	96	95	95	43	89%
POV shift: 3rd person to 1st person (Elena's perspective) Text Editing	100	100	100	100	100	100	100	100%
Tense rewriting: past to present Text Editing	88	87	81	81	81	43	9	67%
Generic Prompt								89.56%
Specific Prompt
Avoid said/asked/replied/answered Text Editing	100	100	100	100	100	100	86	98%
Character rename: Elena->Mirabel, Gregor->Aldric Text Editing	100	100	100	100	100	100	100	100%
Combined: 3rd person past → 1st person present Text Editing	99	99	99	99	99	99	21	88%
Expand all contractions Text Editing	100	100	100	100	38	9	3	64%
Location rename: market square, outer ring, bridge, northern mines Text Editing	100	100	100	100	100	100	100	100%
Multi-character gender swap: Priya(F)->Rohan(M), Mara unchanged Text Editing	100	100	100	100	100	96	45	92%
Passive voice → active voice Text Editing Hallucination	98	98	98	97	95	95	46	90%
POV shift: 3rd person to 1st person (Elena's perspective) Text Editing	100	100	100	100	100	41	37	82%
Tense rewriting: past to present Text Editing	100	100	100	100	100	100	32	90%
Specific Prompt								89.39%
89.48%

Tool usage within Novelcrafter

Output messages that are related to tool usage within Novelcrafter

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
Create alternate prose sections Tooling	100	100	100	100	100	100	100	100	100	100	100%
100.00%

Voice/dialogue sheets

Extract dialogue from given text as voice sheets.

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
Multiple speakers Rule Following	100	100	100	100	100	100	100	0	0	0	70%
Simple Rule Following	100	100	100	100	100	100	100	100	100	0	90%
Simple (1-shot) 1-shot Rule Following	100	100	100	100	100	100	100	100	100	0	90%
Simple (5-shot) Few-shot Rule Following	100	100	100	100	100	100	100	100	0	0	80%
Unattributed dialogue Rule Following	100	100	100	100	100	0	0	0	0	0	50%
76.00%

Write N of X

Write exactly N words/sentences/paragraphs...

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
paragraphs
1 paragraph summary Utility	100	100	100	100	100	100	100	100	100	100	100%
3 paragraph summary Utility	100	100	100	100	100	100	100	100	100	100	100%
5 paragraph summary Utility	100	100	100	100	100	100	100	100	0	0	80%
paragraphs											93.33%
sentences
1 sentence summary Utility	100	100	100	100	100	100	100	100	100	100	100%
3 sentence summary Utility	100	100	100	100	100	100	100	100	100	100	100%
10 sentence summary Utility	100	100	100	100	100	100	100	100	100	100	100%
20 sentence summary Utility	100	100	100	100	100	100	100	98	98	0	90%
50 sentence summary Utility	98	92	77	2	0	0	0	0	0	0	27%
sentences											83.32%
words
10 word summary Utility	100	100	100	100	100	98	98	98	98	98	99%
20 word summary Utility	100	100	100	98	98	92	92	77	54	27	84%
50 word summary Utility	100	77	54	54	54	54	54	27	27	9	51%
100 word summary Utility	100	54	54	0	0	0	0	0	0	0	21%
200 word summary Utility	100	77	0	0	0	0	0	0	0	0	18%
words											54.49%
74.54%