Grok 4 - NC Bench

x-ai/grok-4

Grok 4

via OpenRouter

Release Date

Jul 9th, 2025

Context Size

256k

Reasoning

Yes

Benchmark Cost

$25.47

Speed

38.0 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	78	74	73	73	71	74%
Horror: alone in an eerie place at night Creative Writing Hallucination	80	78	75	74	72	76%
Literary fiction: old friends reunite Creative Writing Hallucination	84	80	79	78	78	80%
Mystery: examining a crime scene Creative Writing Hallucination	81	79	79	77	76	78%
Romance: separated couple reunites Creative Writing Hallucination	83	81	80	80	73	79%
Thriller: chase through city streets Creative Writing Hallucination	80	79	79	77	75	78%
Detailed Writing Rules						77.46%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	71	70	70	67	65	69%
Horror: alone in an eerie place at night Creative Writing Hallucination	77	77	73	73	72	74%
Literary fiction: old friends reunite Creative Writing Hallucination	82	82	81	81	78	81%
Mystery: examining a crime scene Creative Writing Hallucination	80	79	78	78	77	79%
Romance: separated couple reunites Creative Writing Hallucination	83	82	76	75	73	78%
Thriller: chase through city streets Creative Writing Hallucination	90	77	75	75	69	77%
genre						76.23%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	78	76	73	73	71	74%
Horror: alone in an eerie place at night Creative Writing Hallucination	83	76	76	76	73	77%
Literary fiction: old friends reunite Creative Writing Hallucination	81	81	79	77	73	78%
Mystery: examining a crime scene Creative Writing Hallucination	84	82	81	76	72	79%
Romance: separated couple reunites Creative Writing Hallucination	81	80	78	78	75	78%
Thriller: chase through city streets Creative Writing Hallucination	81	76	76	74	71	76%
Novelcrafter Default Prompt						77.01%
76.90%

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	98	98	96	97%
Medium: The Hollow (Inferred) Tooling Reasoning	99	99	98	98	97	98%
Medium: Through the Thornveil (Scattered) Tooling Reasoning	99	99	99	98	98	99%
Short: The Rusty Lantern (Explicit) Tooling Reasoning	100	100	100	99	99	99%
98.38%

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	100	17	17	17	17	17	17	17	17	17	25%
Long text (~1594 words), small codex (11 entries) Hallucination	100	100	100	100	100	100	100	100	25	13	84%
Short text (~524 words), big codex (51 entries) Hallucination	100	100	100	100	100	25	17	17	17	17	59%
Short text (~524 words), small codex (11 entries) Hallucination	100	100	100	100	100	25	17	17	17	13	59%
basic entries											56.67%
detailed entries
Long text (~1594 words), big codex (51 detailed entries) Hallucination	100	100	100	100	100	100	100	25	17	10	75%
Long text (~1594 words), small codex (11 detailed entries) Hallucination	100	100	100	25	25	25	25	17	17	17	45%
Short text (~524 words), big codex (51 detailed entries) Hallucination	100	100	100	100	100	100	100	100	100	100	100%
Short text (~524 words), small codex (11 detailed entries) Hallucination	100	100	100	100	100	100	100	100	100	100	100%
detailed entries											80.04%
68.35%

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	100	99	99	99	99	98	97	97	96	95	98%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	100	100	100	100	98	98	98	98	98	98	99%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	100	97	97	97	95	92	92	79	79	75	90%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	100	100	97	97	97	97	97	97	97	97	97%
matrix											96.10%
tiers
5 codex entries Tooling Reasoning	100	100	100	100	100	100	100	91	91	91	97%
10 codex entries Tooling Reasoning	100	100	100	100	100	100	100	100	100	92	99%
20 codex entries Tooling Reasoning	100	100	97	97	97	97	97	97	94	89	96%
40 codex entries Tooling Reasoning	100	100	100	100	100	100	100	100	100	100	100%
tiers											98.27%
97.18%

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	100	100	100	100	100	100%
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	100	100	100	100	100	100	100	100%
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%
91.67%

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	50	50	50	50	50	50	48	43	0	44%
Write 200 words with 50% dialogue Rule Following Utility	50	50	50	50	49	38	30	22	3	2	34%
Write 200 words with 90% dialogue Rule Following Utility	100	99	94	90	84	76	74	63	55	48	78%
dialogue-200											52.19%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	50	49	49	45	38	30	30	18	7	0	32%
Write 500 words with 50% dialogue Rule Following Utility	50	48	43	38	38	26	2	1	0	0	25%
Write 500 words with 70% dialogue Rule Following Utility	77	46	43	30	29	28	23	21	9	5	31%
dialogue-500											29.11%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	100	100	100%
49.13%

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	0	0	60%
Asking for directions (German) Language	100	100	100	100	0	80%
Friend got new kittens (German) Language	100	100	100	100	100	100%
Friend got new kittens (Tagalog) Language	100	100	100	100	100	100%
85.00%

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	56	50	81%
Character dialogue (Italian) in a story Language	100	100	100	100	100	100%
Character dialogue (Spanish) in a story Language	100	100	100	100	100	100%
96.22%

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	100	100	98	100%
Write sentences with 10 words each Utility	100	97	87	87	84	81	77	77	74	56	82%
Write sentences with 20 words each Utility	84	78	76	69	68	68	67	61	54	39	66%
82.78%

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	100	100	100	100	100	100	100	100	100	100%
outline-count											100.00%
pov-count
Count point of views for Jack and Olivia Utility	100	100	100	100	100	50	50	50	50	0	70%
Count point of views for Jack Harper Utility	100	100	100	100	100	100	100	100	100	100	100%
Count point of views for Olivia Utility	100	100	100	100	100	100	100	100	100	100	100%
pov-count											90.00%
95.00%

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	97	99%
Expand all contractions Text Editing	100	100	100	100	100	100	100	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	98	98	97	97	94	92	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	99	99	99	99	100%
Generic Prompt								99.41%
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	100	100	100	100	100	99	100%
Expand all contractions Text Editing	100	100	100	100	100	100	100	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	99	99	99	99	98	98	98	99%
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	99	99	99	99	99	99	99%
Specific Prompt								99.77%
99.59%

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	0	0	0	0	60%
Simple Rule Following	100	0	0	0	0	0	0	0	0	0	10%
Simple (1-shot) 1-shot Rule Following	100	100	100	100	100	100	100	100	0	0	80%
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%
68.00%

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	100	100	100	100	0	0	80%
50 sentence summary Utility	100	100	100	100	100	100	0	0	0	0	60%
sentences											88.00%
words
10 word summary Utility	100	100	100	100	100	100	100	100	100	100	100%
20 word summary Utility	100	100	100	100	100	100	100	100	100	98	100%
50 word summary Utility	100	100	100	100	100	100	100	100	92	92	98%
100 word summary Utility	100	92	92	92	77	54	9	9	2	2	53%
200 word summary Utility	100	100	98	92	92	77	54	27	9	0	65%
words											83.22%
88.93%