DeepSeek V4 Pro - NC Bench

deepseek/deepseek-v4-pro

DeepSeek V4 Pro

via OpenRouter

Release Date

Apr 24th, 2026

Context Size

Reasoning

Benchmark Cost

$1.87

Speed

27.1 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	87	85	83	82	82	84%
Horror: alone in an eerie place at night Creative Writing Hallucination	91	90	89	85	84	88%
Literary fiction: old friends reunite Creative Writing Hallucination	92	92	86	86	84	88%
Mystery: examining a crime scene Creative Writing Hallucination	90	87	87	84	80	86%
Romance: separated couple reunites Creative Writing Hallucination	88	88	88	87	87	88%
Thriller: chase through city streets Creative Writing Hallucination	93	93	92	82	69	86%
Detailed Writing Rules						86.41%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	77	76	76	76	75	76%
Horror: alone in an eerie place at night Creative Writing Hallucination	86	81	75	75	71	78%
Literary fiction: old friends reunite Creative Writing Hallucination	85	81	79	77	75	79%
Mystery: examining a crime scene Creative Writing Hallucination	83	79	77	76	71	77%
Romance: separated couple reunites Creative Writing Hallucination	86	84	84	78	76	82%
Thriller: chase through city streets Creative Writing Hallucination	84	84	82	78	78	81%
genre						78.85%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	84	84	83	83	76	82%
Horror: alone in an eerie place at night Creative Writing Hallucination	87	85	83	81	76	82%
Literary fiction: old friends reunite Creative Writing Hallucination	91	89	82	81	79	84%
Mystery: examining a crime scene Creative Writing Hallucination	89	86	82	79	79	83%
Romance: separated couple reunites Creative Writing Hallucination	89	85	83	82	81	84%
Thriller: chase through city streets Creative Writing Hallucination	86	85	84	83	80	83%
Novelcrafter Default Prompt						83.15%
82.80%

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	97	95	93	93	91	94%
Medium: The Hollow (Inferred) Tooling Reasoning	97	95	95	95	94	95%
Medium: Through the Thornveil (Scattered) Tooling Reasoning	97	96	96	95	93	96%
Short: The Rusty Lantern (Explicit) Tooling Reasoning	98	97	97	97	96	97%
95.44%

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	50	35	28	27	25	17	17	8	4	1	21%
Long text (~1594 words), small codex (11 entries) Hallucination	50	50	50	42	42	42	29	28	25	25	38%
Short text (~524 words), big codex (51 entries) Hallucination	100	100	50	50	50	42	35	29	25	6	49%
Short text (~524 words), small codex (11 entries) Hallucination	50	50	50	35	31	30	25	17	13	13	31%
basic entries											34.82%
detailed entries
Long text (~1594 words), big codex (51 detailed entries) Hallucination	50	50	50	50	50	38	38	26	25	1	38%
Long text (~1594 words), small codex (11 detailed entries) Hallucination	50	50	50	50	42	35	28	10	8	4	33%
Short text (~524 words), big codex (51 detailed entries) Hallucination	100	100	100	50	50	29	28	25	17	17	51%
Short text (~524 words), small codex (11 detailed entries) Hallucination	50	50	50	33	28	25	25	17	3	3	28%
detailed entries											37.55%
36.18%

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	88	86	86	84	84	83	82	81	79	73	82%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	100	91	91	91	91	89	89	87	87	87	90%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	92	92	83	83	83	80	76	75	72	3	74%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	100	100	97	97	97	95	95	95	92	3	87%
matrix											83.50%
tiers
5 codex entries Tooling Reasoning	100	100	100	100	100	100	100	91	91	83	97%
10 codex entries Tooling Reasoning	100	100	100	100	100	100	100	100	92	86	98%
20 codex entries Tooling Reasoning	96	96	88	88	88	88	88	85	81	78	88%
40 codex entries Tooling Reasoning	100	95	92	92	92	92	92	92	92	83	92%
tiers											93.53%
88.51%

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	100	100	100	100	100	50	50	50	50	50	75%
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	50	50	50	50	50	0	0	0	0	0	25%
What instrument does Lucy play? Reasoning	100	100	100	100	100	100	100	100	100	100	100%
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	0	0	0	0	0	0	0	0	0	0	0%
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%
83.33%

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	62	51	48	26	3	2	2	0	0	0	19%
Write 200 words with 50% dialogue Rule Following Utility	50	49	48	43	24	3	0	0	0	0	22%
Write 200 words with 90% dialogue Rule Following Utility	59	56	40	26	19	19	18	18	18	18	29%
dialogue-200											23.40%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	0	0	0	0	0	0	0	0	0	0	0%
Write 500 words with 50% dialogue Rule Following Utility	0	0	0	0	0	0	0	0	0	0	0%
Write 500 words with 70% dialogue Rule Following Utility	0	0	0	0	0	0	0	0	0	0	0%
dialogue-500											0.00%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	100	100	100%
24.32%

Language Comprehension

Does the model understand more than just English?

Scenario	#1	#2	#3	#4	#5	Total
Asking for directions (Dutch) Language	0	0	0	0	0	0%
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%
70.00%

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	75	95%
Character dialogue (German) in a story Language	100	100	100	83	79	92%
Character dialogue (Hindi) in a story Language	100	60	0	0	0	32%
Character dialogue (Italian) in a story Language	100	100	100	93	0	79%
Character dialogue (Spanish) in a story Language	100	100	100	100	0	80%
75.59%

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	100	100	100	100	100	98	98	89	98%
Write sentences with 10 words each Utility	100	100	97	95	94	93	92	87	74	72	90%
Write sentences with 20 words each Utility	12	6	6	4	0	0	0	0	0	0	3%
63.90%

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	50	50	50	0	0	0	0	45%
Count point of views for Jack Harper Utility	100	100	100	0	0	0	0	0	0	0	30%
Count point of views for Olivia Utility	100	100	100	100	100	100	0	0	0	0	60%
pov-count											45.00%
57.50%

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	100	100%
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	99	99%
Expand all contractions Text Editing	100	100	99	99	99	99	99	99%
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	100	100	100%
Passive voice → active voice Text Editing Hallucination	95	95	94	94	92	91	91	93%
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	100	100	100	99	99	99	99	100%
Generic Prompt								99.05%
Specific Prompt
Avoid said/asked/replied/answered Text Editing	100	100	100	100	100	100	100	100%
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	100	99	99	99	99	99	99	99%
Expand all contractions Text Editing	100	100	100	100	100	100	99	100%
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	100	100	100%
Passive voice → active voice Text Editing Hallucination	98	97	97	96	96	95	95	96%
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	100	100	100	100	100	100	100	100%
Specific Prompt								99.51%
99.28%

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	0	0	0	0	0	50%
Simple Rule Following	100	100	100	100	100	100	100	100	0	0	80%
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	100	0	90%
Unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	100	100	100%
82.00%

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	100	100	100%
paragraphs											100.00%
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	98	98	98	92	54	27	87%
50 sentence summary Utility	100	100	100	100	98	54	54	27	0	0	63%
sentences											90.01%
words
10 word summary Utility	100	100	100	100	100	100	100	100	100	100	100%
20 word summary Utility	100	98	92	92	92	92	92	77	77	77	89%
50 word summary Utility	100	100	100	98	98	92	77	54	9	2	73%
100 word summary Utility	77	27	0	0	0	0	0	0	0	0	10%
200 word summary Utility	92	77	0	0	0	0	0	0	0	0	17%
words											57.93%
79.98%