Grok 4.1 Fast - NC Bench

x-ai/grok-4.1-fast

Grok 4.1 Fast

via OpenRouter

Release Date

Nov 19th, 2025

Context Size

Benchmark Cost

$0.58

Speed

116.2 tok/s

Creative writing

72.22%

Rule following

80.37%

Utility

87.75%

Mathematics

100.00%

Tooling

91.54%

Language

90.35%

Logic

90.50%

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	79	78	78	78	75	78%
Horror: alone in an eerie place at night 0-shot Creative writingRule following	89	83	83	79	78	82%
Literary fiction: old friends reunite 0-shot Creative writingRule following	88	85	85	85	82	85%
Mystery: examining a crime scene 0-shot Creative writingRule following	89	88	87	84	83	86%
Romance: separated couple reunites 0-shot Creative writingRule following	92	88	86	85	81	86%
Thriller: chase through city streets 0-shot Creative writingRule following	87	85	83	82	78	83%
Detailed Writing Rules						83.50%
genre
Fantasy: entering an ancient ruin 0-shot Creative writingRule following	76	76	76	74	72	75%
Horror: alone in an eerie place at night 0-shot Creative writingRule following	85	80	80	78	78	80%
Literary fiction: old friends reunite 0-shot Creative writingRule following	83	82	81	81	80	82%
Mystery: examining a crime scene 0-shot Creative writingRule following	84	83	80	79	75	81%
Romance: separated couple reunites 0-shot Creative writingRule following	82	80	80	77	76	79%
Thriller: chase through city streets 0-shot Creative writingRule following	83	82	80	76	73	79%
genre						79.08%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin 0-shot Creative writingRule following	82	81	78	77	74	78%
Horror: alone in an eerie place at night 0-shot Creative writingRule following	86	83	82	82	73	81%
Literary fiction: old friends reunite 0-shot Creative writingRule following	89	85	85	82	82	85%
Mystery: examining a crime scene 0-shot Creative writingRule following	84	83	80	79	78	81%
Romance: separated couple reunites 0-shot Creative writingRule following	83	81	80	80	79	81%
Thriller: chase through city streets 0-shot Creative writingRule following	85	85	85	85	84	85%
Novelcrafter Default Prompt						81.74%
81.44%

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	98	97	97	95	95	94	90	90	95%
Large codex (40 entries), short passage (165 words) 0-shot ToolingUtilityLogicRule following	98	98	98	96	96	96	96	95	94	93	96%
Small codex (7 entries), long passage (734 words) 0-shot ToolingUtilityLogicRule following	100	100	97	95	95	92	92	88	87	79	93%
Small codex (7 entries), short passage (165 words) 0-shot ToolingUtilityLogicRule following	100	100	100	100	100	100	100	100	97	97	99%
matrix											95.84%
tiers
5 codex entries 0-shot ToolingUtilityLogicRule following	100	100	100	100	100	100	100	100	100	100	100%
10 codex entries 0-shot ToolingUtilityLogicRule following	100	100	100	100	100	100	100	100	100	100	100%
20 codex entries 0-shot ToolingUtilityLogicRule following	97	97	97	97	97	94	94	92	91	91	95%
40 codex entries 0-shot ToolingUtilityLogicRule following	100	100	100	100	100	100	100	100	100	100	100%
tiers											98.67%
97.25%

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	50	50	50	50	50	50	50	65%
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	50	50	50	50	80%
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	50	50	50	50	80%
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	50	50	90%
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%
84.58%

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	99	50	50	50	50	49	47	45	45	43	53%
Write 200 words with 50% dialogue 0-shot Creative writingRule following	99	93	81	69	68	60	53	50	49	7	63%
Write 200 words with 90% dialogue 0-shot Creative writingRule following	100	94	89	86	77	70	64	63	57	32	73%
dialogue-200											62.91%
dialogue-500
Write 500 words with 30% dialogue 0-shot Creative writingRule following	50	43	34	0	0	0	0	0	0	0	13%
Write 500 words with 50% dialogue 0-shot Creative writingRule following	50	3	1	1	0	0	0	0	0	0	5%
Write 500 words with 70% dialogue 0-shot Creative writingRule following	93	48	41	38	31	27	25	15	7	3	33%
dialogue-500											16.97%
Ungrouped
Write unattributed dialogue 0-shot Creative writingRule following	100	100	100	100	100	100	100	100	100	100	100%
48.52%

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	100	100	100%
Asking for directions (German) 0-shot Language	100	100	100	0	0	60%
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%
90.00%

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	56	56	55	50	50	53%
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%
90.63%

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	99	91	80	78	78	78	78	78	78	84%
Write sentences with 10 words each 0-shot Rule following	100	100	97	95	94	91	90	85	84	84	92%
Write sentences with 20 words each 0-shot Rule following	100	90	85	22	19	15	3	1	0	0	33%
69.73%

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	50	50	50	50	50	50	50	0	0	0	35%
Count point of views for Jack Harper 0-shot ToolingUtility	100	100	100	100	100	100	100	100	0	0	80%
Count point of views for Olivia 0-shot ToolingUtility	100	100	100	100	100	100	100	100	0	0	80%
pov-count											65.00%
82.50%

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	100	100	100	100	100	100	100	0	0	80%
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	100	100%
Unattributed dialogue 0-shot Utility	100	100	100	100	100	100	100	100	100	100	100%
84.00%

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	54	27	88%
50 sentence summary 0-shot Rule following	100	100	100	100	100	100	100	100	100	0	90%
sentences											95.61%
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	98	98	98	100%
50 word summary 0-shot Rule following	100	100	100	100	100	100	98	98	92	27	92%
100 word summary 0-shot Rule following	98	92	92	77	77	9	9	9	0	0	47%
200 word summary 0-shot Rule following	98	98	92	9	0	0	0	0	0	0	30%
words											73.49%
88.11%