Grok 4 - NC Bench

x-ai/grok-4

Grok 4

via OpenRouter

Release Date

Jul 9th, 2025

Context Size

256k

Benchmark Cost

$15.86

Speed

35.0 tok/s

Creative writing

69.01%

Rule following

79.98%

Utility

89.92%

Mathematics

100.00%

Tooling

95.83%

Language

91.23%

Logic

92.34%

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 0-shot Creative writingRule following	78	74	73	73	71	74%
Horror: alone in an eerie place at night 0-shot Creative writingRule following	80	78	75	74	72	76%
Literary fiction: old friends reunite 0-shot Creative writingRule following	84	80	79	78	78	80%
Mystery: examining a crime scene 0-shot Creative writingRule following	81	79	79	77	76	78%
Romance: separated couple reunites 0-shot Creative writingRule following	83	81	80	80	73	79%
Thriller: chase through city streets 0-shot Creative writingRule following	80	79	79	77	75	78%
Detailed Writing Rules						77.47%
genre
Fantasy: entering an ancient ruin 0-shot Creative writingRule following	71	70	70	67	65	69%
Horror: alone in an eerie place at night 0-shot Creative writingRule following	77	77	73	73	72	74%
Literary fiction: old friends reunite 0-shot Creative writingRule following	82	82	81	81	78	81%
Mystery: examining a crime scene 0-shot Creative writingRule following	80	79	78	78	77	79%
Romance: separated couple reunites 0-shot Creative writingRule following	83	82	76	75	73	78%
Thriller: chase through city streets 0-shot Creative writingRule following	90	77	75	75	69	77%
genre						76.24%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin 0-shot Creative writingRule following	78	76	73	73	71	74%
Horror: alone in an eerie place at night 0-shot Creative writingRule following	83	76	76	76	73	77%
Literary fiction: old friends reunite 0-shot Creative writingRule following	81	81	79	77	73	78%
Mystery: examining a crime scene 0-shot Creative writingRule following	84	82	81	76	72	79%
Romance: separated couple reunites 0-shot Creative writingRule following	81	80	78	78	75	78%
Thriller: chase through city streets 0-shot Creative writingRule following	81	77	76	74	71	76%
Novelcrafter Default Prompt						77.02%
76.91%

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) 0-shot ToolingUtilityLogicRule following	100	99	99	99	99	98	97	97	96	95	98%
Large codex (40 entries), short passage (165 words) 0-shot ToolingUtilityLogicRule following	100	100	100	100	98	98	98	98	98	98	99%
Small codex (7 entries), long passage (734 words) 0-shot ToolingUtilityLogicRule following	100	97	97	97	95	92	92	79	79	75	90%
Small codex (7 entries), short passage (165 words) 0-shot ToolingUtilityLogicRule following	100	100	97	97	97	97	97	97	97	97	97%
matrix											96.10%
tiers
5 codex entries 0-shot ToolingUtilityLogicRule following	100	100	100	100	100	100	100	91	91	91	97%
10 codex entries 0-shot ToolingUtilityLogicRule following	100	100	100	100	100	100	100	100	100	92	99%
20 codex entries 0-shot ToolingUtilityLogicRule following	100	100	97	97	97	97	97	97	94	89	96%
40 codex entries 0-shot ToolingUtilityLogicRule following	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 0-shot Utility	100	100	100	100	100	100	100	100	100	100	100%
Contextual pronoun 0-shot Utility	100	100	100	100	100	100	100	100	100	100	100%
Fruits excluding citrus 0-shot Utility	100	100	100	100	100	100	100	100	100	100	100%
Future event time 0-shot UtilityLogic	100	100	100	100	100	100	100	100	100	100	100%
Guess the pet 0-shot UtilityLogic	100	100	100	100	100	100	100	100	100	100	100%
Highest-rated movie 0-shot Utility	100	100	100	100	100	100	100	100	100	100	100%
Indirect birth year 0-shot UtilityMathematicsLogic	100	100	100	100	100	100	100	100	100	100	100%
What instrument does Lucy play? 0-shot UtilityLogic	100	100	100	100	100	100	100	100	100	100	100%
What's the color of the car? 0-shot UtilityLogic	100	100	100	100	100	100	100	100	100	100	100%
What's the correct time? 0-shot UtilityLogic	0	0	0	0	0	0	0	0	0	0	0%
Who's the sister? 0-shot UtilityLogic	100	100	100	100	100	100	100	100	100	100	100%
Who's the tallest? 0-shot UtilityLogic	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 0-shot Creative writingRule following	50	50	50	50	50	50	49	49	43	0	44%
Write 200 words with 50% dialogue 0-shot Creative writingRule following	50	50	50	50	49	30	26	18	3	0	33%
Write 200 words with 90% dialogue 0-shot Creative writingRule following	100	99	92	90	84	74	67	54	51	48	76%
dialogue-200											50.87%
dialogue-500
Write 500 words with 30% dialogue 0-shot Creative writingRule following	48	41	41	38	34	30	30	22	2	0	28%
Write 500 words with 50% dialogue 0-shot Creative writingRule following	50	47	43	30	22	22	2	1	0	0	22%
Write 500 words with 70% dialogue 0-shot Creative writingRule following	72	56	54	47	46	29	28	23	21	5	38%
dialogue-500											29.43%
Ungrouped
Write unattributed dialogue 0-shot Creative writingRule following	100	100	100	100	100	100	100	100	100	100	100%
48.70%

Language Comprehension

Does the model understand more than just English?

Scenario	#1	#2	#3	#4	#5	Total
Asking for directions (Dutch) 0-shot Language	100	100	100	0	0	60%
Asking for directions (German) 0-shot Language	100	100	100	100	0	80%
Friend got new kittens (German) 0-shot Language	100	100	100	100	100	100%
Friend got new kittens (Tagalog) 0-shot 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 0-shot Language	100	100	100	100	100	100%
Character dialogue (German) in a story 0-shot Language	100	100	100	100	100	100%
Character dialogue (Hindi) in a story 0-shot Language	100	100	100	56	50	81%
Character dialogue (Italian) in a story 0-shot Language	100	100	100	100	100	100%
Character dialogue (Spanish) in a story 0-shot 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 0-shot Rule following	100	100	100	100	100	100	100	100	100	98	100%
Write sentences with 10 words each 0-shot Rule following	100	95	84	84	84	84	82	77	74	56	82%
Write sentences with 20 words each 0-shot Rule following	80	78	76	72	69	68	64	64	55	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 0-shot ToolingUtility	100	100	100	100	100	100	100	100	100	100	100%
Count chapters 0-shot ToolingUtility	100	100	100	100	100	100	100	100	100	100	100%
Count scenes 0-shot ToolingUtility	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 0-shot ToolingUtility	100	100	100	100	50	50	50	50	0	0	60%
Count point of views for Jack Harper 0-shot ToolingUtility	100	100	100	100	100	100	100	100	100	100	100%
Count point of views for Olivia 0-shot ToolingUtility	100	100	100	100	100	100	100	100	100	100	100%
pov-count											86.67%
93.33%

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 0-shot ToolingUtility	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 0-shot Utility	100	100	100	100	100	100	0	0	0	0	60%
Simple 0-shot Utility	100	0	0	0	0	0	0	0	0	0	10%
Simple (1-shot) 1-shot Utility	100	100	100	100	100	100	100	100	0	0	80%
Simple (5-shot) Few-shot Utility	100	100	100	100	100	100	100	100	100	0	90%
Unattributed dialogue 0-shot Utility	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 0-shot Rule following	100	100	100	100	100	100	100	100	100	100	100%
3 paragraph summary 0-shot Rule following	100	100	100	100	100	100	100	100	100	100	100%
5 paragraph summary 0-shot Rule following	100	100	100	100	100	100	100	100	100	100	100%
paragraphs											100.00%
sentences
1 sentence summary 0-shot Rule following	100	100	100	100	100	100	100	100	100	100	100%
3 sentence summary 0-shot Rule following	100	100	100	100	100	100	100	100	100	100	100%
10 sentence summary 0-shot Rule following	100	100	100	100	100	100	100	100	100	100	100%
20 sentence summary 0-shot Rule following	100	100	100	100	100	100	100	100	0	0	80%
50 sentence summary 0-shot Rule following	100	100	100	100	100	100	0	0	0	0	60%
sentences											88.00%
words
10 word summary 0-shot Rule following	100	100	100	100	100	100	100	100	100	100	100%
20 word summary 0-shot Rule following	100	100	100	100	100	100	100	100	100	92	99%
50 word summary 0-shot Rule following	100	100	100	100	100	100	100	98	92	92	98%
100 word summary 0-shot Rule following	100	98	92	92	92	92	54	27	27	9	68%
200 word summary 0-shot Rule following	100	100	98	92	92	54	54	27	2	0	62%
words											85.54%
89.83%